<section>
 <h1 class="contains-headerlink leafygreen-ui-41fr9s" weight="medium">
  split
  <a class="headerlink leafygreen-ui-1kepx47" href="#split" title="Permalink to this heading">
   <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
    <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
    </path>
    <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
    </path>
   </svg>
   <div class="css-1btu0w3 evvkmar0" id="split">
   </div>
  </a>
 </h1>
 <div class="leafygreen-ui-a5yxub">
  <p class="css-1cmx2d4 ef7gu8j0">
   On this page
  </p>
  <ul class="css-1qb0mst ef7gu8j1">
   <li class="leafygreen-ui-1e7a0ei">
    <a class="lg-ui-0001 leafygreen-ui-e98ikf" href="#definition" target="_self">
     <span>
      Definition
     </span>
    </a>
   </li>
   <li class="leafygreen-ui-1jqtqlb">
    <a class="lg-ui-0001 leafygreen-ui-cpmeq5" href="#compatibility" target="_self">
     <span>
      Compatibility
     </span>
    </a>
   </li>
   <li class="leafygreen-ui-1jqtqlb">
    <a class="lg-ui-0001 leafygreen-ui-cpmeq5" href="#syntax" target="_self">
     <span>
      Syntax
     </span>
    </a>
   </li>
   <li class="leafygreen-ui-1jqtqlb">
    <a class="lg-ui-0001 leafygreen-ui-cpmeq5" href="#command-fields" target="_self">
     <span>
      Command Fields
     </span>
    </a>
   </li>
   <li class="leafygreen-ui-1jqtqlb">
    <a class="lg-ui-0001 leafygreen-ui-cpmeq5" href="#considerations" target="_self">
     <span>
      Considerations
     </span>
    </a>
   </li>
   <li class="leafygreen-ui-1jqtqlb">
    <a class="lg-ui-0001 leafygreen-ui-cpmeq5" href="#command-formats" target="_self">
     <span>
      Command Formats
     </span>
    </a>
   </li>
   <li class="leafygreen-ui-1jqtqlb">
    <a class="lg-ui-0001 leafygreen-ui-cpmeq5" href="#examples" target="_self">
     <span>
      Examples
     </span>
    </a>
   </li>
   <li class="leafygreen-ui-1jqtqlb">
    <a class="lg-ui-0001 leafygreen-ui-cpmeq5" href="#metadata-lock-error" target="_self">
     <span>
      Metadata Lock Error
     </span>
    </a>
   </li>
  </ul>
 </div>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Definition
   <a class="headerlink leafygreen-ui-1kepx47" href="#definition" title="Permalink to this heading">
    <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
     <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
     </path>
    </svg>
    <div class="css-1btu0w3 evvkmar0" id="definition">
    </div>
   </a>
  </h2>
  <dl class="dbcommand">
   <dt>
    <code class="leafygreen-ui-1l06pbn">
     split
    </code>
    <a class="headerlink leafygreen-ui-1kepx47" href="#mongodb-dbcommand-dbcmd.split" title="Permalink to this definition">
     <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
      <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
      </path>
      <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
      </path>
     </svg>
     <div class="css-1btu0w3 evvkmar0" id="mongodb-dbcommand-dbcmd.split">
     </div>
    </a>
   </dt>
   <dd>
    <p class="leafygreen-ui-1kp3ins">
     Splits a
     <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/glossary/#std-term-chunk">
      chunk
     </a>
     in a
     <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/glossary/#std-term-sharded-cluster">
      sharded cluster
     </a>
     into two chunks.
Shards manage and split chunks based on the chunk size statistics they
maintain.
    </p>
    <p class="leafygreen-ui-1kp3ins">
     For exceptional circumstances the
     <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
      <span>
       <code class="leafygreen-ui-1l06pbn">
        split
       </code>
      </span>
     </a>
     command does
allow administrators to manually create splits. See
     <a class="leafygreen-ui-tqgtui" href="/docs/manual/tutorial/split-chunks-in-sharded-cluster/">
      Split Chunks in a Sharded Cluster
     </a>
     for information on
these circumstances, and on the MongoDB shell commands that wrap
     <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
      <span>
       <code class="leafygreen-ui-1l06pbn">
        split
       </code>
       .
      </span>
     </a>
    </p>
    <p class="leafygreen-ui-1kp3ins">
     The
     <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
      <span>
       <code class="leafygreen-ui-1l06pbn">
        split
       </code>
      </span>
     </a>
     command must be run in the
     <code class="leafygreen-ui-1l06pbn">
      admin
     </code>
     database.
    </p>
    <div class="leafygreen-ui-13vw3ie" role="note">
     <h2 class="leafygreen-ui-1fn4p2b">
      Tip
     </h2>
     <div class="leafygreen-ui-9mycqc">
      <p class="leafygreen-ui-1kp3ins">
       In
       <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="https://www.mongodb.com/docs/mongodb-shell/#std-program-mongosh" target="_self">
        <span>
         <code class="leafygreen-ui-1l06pbn">
          mongosh
         </code>
        </span>
       </a>
       , this command can also be run through the
       <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/method/sh.splitAt/#mongodb-method-sh.splitAt">
        <code class="leafygreen-ui-1l06pbn">
         sh.splitAt()
        </code>
       </a>
       and
       <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/method/sh.splitFind/#mongodb-method-sh.splitFind">
        <code class="leafygreen-ui-1l06pbn">
         sh.splitFind()
        </code>
       </a>
       helper methods
       <!-- -->
       .
      </p>
      <p class="leafygreen-ui-1kp3ins">
       Helper methods are convenient for
       <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="https://www.mongodb.com/docs/mongodb-shell/#std-program-mongosh" target="_self">
        <span>
         <code class="leafygreen-ui-1l06pbn">
          mongosh
         </code>
        </span>
       </a>
       users, but they may not
return the same level of information as database commands.  In cases where
the convenience is not needed or the additional return fields are required,
use the database command.
      </p>
     </div>
    </div>
   </dd>
  </dl>
 </section>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Compatibility
   <a class="headerlink leafygreen-ui-1kepx47" href="#compatibility" title="Permalink to this heading">
    <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
     <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
     </path>
    </svg>
    <div class="css-1btu0w3 evvkmar0" id="compatibility">
    </div>
   </a>
  </h2>
  <p class="leafygreen-ui-1kp3ins">
   This command is available in deployments hosted in the following environments:
  </p>
  <ul class="leafygreen-ui-rioki0">
   <li class="leafygreen-ui-d7p7b6">
    <p class="leafygreen-ui-1kp3ins">
     <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="https://www.mongodb.com/docs/atlas?tck=docs_server" target="_self">
      <span>
       MongoDB Atlas
      </span>
     </a>
     : The fully
managed service for MongoDB deployments in the cloud
    </p>
   </li>
  </ul>
  <div class="leafygreen-ui-85da11" role="note">
   <h2 class="leafygreen-ui-1ac4g5h">
    Important
   </h2>
   <div class="leafygreen-ui-9mycqc">
    <p class="leafygreen-ui-1kp3ins">
     This command is not supported in serverless instances.
For more information, see
     <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="https://www.mongodb.com/docs/atlas/unsupported-commands/" target="_self">
      <span>
       Unsupported Commands
       <!-- -->
       .
      </span>
     </a>
    </p>
   </div>
  </div>
  <ul class="leafygreen-ui-rioki0">
   <li class="leafygreen-ui-d7p7b6">
    <p class="leafygreen-ui-1kp3ins">
     <a class="leafygreen-ui-tqgtui" href="/docs/manual/administration/install-enterprise/#std-label-install-mdb-enterprise">
      MongoDB Enterprise
     </a>
     : The
subscription-based, self-managed version of MongoDB
    </p>
   </li>
   <li class="leafygreen-ui-d7p7b6">
    <p class="leafygreen-ui-1kp3ins">
     <a class="leafygreen-ui-tqgtui" href="/docs/manual/administration/install-community/#std-label-install-mdb-community-edition">
      MongoDB Community
     </a>
     : The
source-available, free-to-use, and self-managed version of MongoDB
    </p>
   </li>
  </ul>
 </section>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Syntax
   <a class="headerlink leafygreen-ui-1kepx47" href="#syntax" title="Permalink to this heading">
    <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
     <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
     </path>
    </svg>
    <div class="css-1btu0w3 evvkmar0" id="syntax">
    </div>
   </a>
  </h2>
  <p class="leafygreen-ui-1kp3ins">
   The command has the following syntax:
  </p>
  <script class="structured_data" type="application/ld+json">
   {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"db.adminCommand(\n   {\n     split: &lt;database&gt;.&lt;collection&gt;, &lt;find|middle|bounds&gt;\n   }\n)","programmingLanguage":"JavaScript"}
  </script>
  <div class="css-16lmvu9">
   <div class="leafygreen-ui-196mwvg">
    <div class="leafygreen-ui-yzcs8i">
     <pre class="leafygreen-ui-11itue3" tabindex="-1"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">db.<span class="lg-highlight-title lg-highlight-function">adminCommand</span>(</td></tr><tr class=""><td class="leafygreen-ui-7razhx">   <!-- -->{</td></tr><tr class=""><td class="leafygreen-ui-7razhx">     <span class="lg-highlight-attr">split</span>: &lt;<!-- -->database<!-- -->&gt;<!-- -->.<!-- -->&lt;<!-- -->collection<!-- -->&gt;<!-- -->,<!-- --> <span class="lg-highlight-xml">&lt;find|middle|bounds&gt;</span></td></tr><tr class=""><td class="leafygreen-ui-7razhx"><span class="lg-highlight-xml">   }</span></td></tr><tr class=""><td class="leafygreen-ui-7razhx"><span class="lg-highlight-xml">)</span></td></tr></tbody></table></code></pre>
     <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
      <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
       <div class="leafygreen-ui-xhlipt">
        <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
         <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
         </path>
        </svg>
       </div>
      </button>
     </div>
    </div>
   </div>
  </div>
 </section>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Command Fields
   <a class="headerlink leafygreen-ui-1kepx47" href="#command-fields" title="Permalink to this heading">
    <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
     <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
     </path>
    </svg>
    <div class="css-1btu0w3 evvkmar0" id="command-fields">
    </div>
   </a>
  </h2>
  <p class="leafygreen-ui-1kp3ins">
   The command takes the following fields:
  </p>
  <div class="leafygreen-ui-skkc39" tabindex="0">
   <table class="leafygreen-ui-hr8lsv">
    <colgroup>
     <col style="width:20%"/>
     <col style="width:20%"/>
     <col style="width:80%"/>
    </colgroup>
    <thead class="leafygreen-ui-a9ho40">
     <tr data-testid="leafygreen-ui-header-row">
      <th class="leafygreen-ui-1trtg6r" role="columnheader" scope="col">
       <div class="leafygreen-ui-ui0te9">
        <div>
         Field
        </div>
       </div>
      </th>
      <th class="leafygreen-ui-13uteka" role="columnheader" scope="col">
       <div class="leafygreen-ui-ui0te9">
        <div>
         Type
        </div>
       </div>
      </th>
      <th class="leafygreen-ui-13uteka" role="columnheader" scope="col">
       <div class="leafygreen-ui-ui0te9">
        <div>
         Description
        </div>
       </div>
      </th>
     </tr>
    </thead>
    <tbody>
     <tr class="">
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         <code class="leafygreen-ui-1l06pbn">
          split
         </code>
        </div>
       </div>
      </td>
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         string
        </div>
       </div>
      </td>
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         The name of the
         <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/glossary/#std-term-collection">
          collection
         </a>
         where the
         <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/glossary/#std-term-chunk">
          chunk
         </a>
         exists.
Specify the collection's full
         <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/glossary/#std-term-namespace">
          namespace
         </a>
         , including the
database name.
        </div>
       </div>
      </td>
     </tr>
     <tr class="">
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         <code class="leafygreen-ui-1l06pbn">
          find
         </code>
        </div>
       </div>
      </td>
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         document
        </div>
       </div>
      </td>
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         <p class="leafygreen-ui-1kp3ins">
          An query statement that specifies an equality match on the shard
key. The match selects the chunk that contains the specified
document. You must specify only one of the following:
          <code class="leafygreen-ui-1l06pbn">
           find
          </code>
          ,
          <code class="leafygreen-ui-1l06pbn">
           bounds
          </code>
          , or
          <code class="leafygreen-ui-1l06pbn">
           middle
          </code>
          .
         </p>
         <p class="leafygreen-ui-1kp3ins">
          You cannot use the
          <code class="leafygreen-ui-1l06pbn">
           find
          </code>
          option on an empty collection.
         </p>
        </div>
       </div>
      </td>
     </tr>
     <tr class="">
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         <code class="leafygreen-ui-1l06pbn">
          bounds
         </code>
        </div>
       </div>
      </td>
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         array
        </div>
       </div>
      </td>
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         <p class="leafygreen-ui-1kp3ins">
          <code class="leafygreen-ui-1l06pbn">
           bounds
          </code>
          applies to chunks in collections partitioned using a
          <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/glossary/#std-term-hashed-shard-key">
           hashed shard key
          </a>
          . The parameter's array must consist of
two documents specifying the lower and upper shard-key values of
the chunk. The values must match the minimum and maximum values
of an existing chunk. Specify only one of the following:
          <code class="leafygreen-ui-1l06pbn">
           find
          </code>
          ,
          <code class="leafygreen-ui-1l06pbn">
           bounds
          </code>
          , or
          <code class="leafygreen-ui-1l06pbn">
           middle
          </code>
          .
         </p>
         <p class="leafygreen-ui-1kp3ins">
          You cannot use the
          <code class="leafygreen-ui-1l06pbn">
           bounds
          </code>
          option on an empty collection.
         </p>
        </div>
       </div>
      </td>
     </tr>
     <tr class="">
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         <code class="leafygreen-ui-1l06pbn">
          middle
         </code>
        </div>
       </div>
      </td>
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         document
        </div>
       </div>
      </td>
      <td class="leafygreen-ui-1drjk7h">
       <div class="leafygreen-ui-1n4j8xf">
        <div>
         The document to use as the split point to create two chunks.
         <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
          <span>
           <code class="leafygreen-ui-1l06pbn">
            split
           </code>
          </span>
         </a>
         requires one of the following options:
         <code class="leafygreen-ui-1l06pbn">
          find
         </code>
         ,
         <code class="leafygreen-ui-1l06pbn">
          bounds
         </code>
         , or
         <code class="leafygreen-ui-1l06pbn">
          middle
         </code>
         .
        </div>
       </div>
      </td>
     </tr>
    </tbody>
   </table>
  </div>
 </section>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Considerations
   <a class="headerlink leafygreen-ui-1kepx47" href="#considerations" title="Permalink to this heading">
    <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
     <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
     </path>
    </svg>
    <div class="css-1btu0w3 evvkmar0" id="considerations">
    </div>
   </a>
  </h2>
  <p class="leafygreen-ui-1kp3ins">
   When used with either the
   <code class="leafygreen-ui-1l06pbn">
    find
   </code>
   or the
   <code class="leafygreen-ui-1l06pbn">
    bounds
   </code>
   option, the
   <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
    <span>
     <code class="leafygreen-ui-1l06pbn">
      split
     </code>
    </span>
   </a>
   command splits the chunk along the median. As such,
the command cannot use the
   <code class="leafygreen-ui-1l06pbn">
    find
   </code>
   or the
   <code class="leafygreen-ui-1l06pbn">
    bounds
   </code>
   option to split
an empty chunk since an empty chunk has no median.
  </p>
  <p class="leafygreen-ui-1kp3ins">
   To create splits in empty chunks, use either the
   <code class="leafygreen-ui-1l06pbn">
    middle
   </code>
   option with
the
   <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
    <span>
     <code class="leafygreen-ui-1l06pbn">
      split
     </code>
    </span>
   </a>
   command or use the
   <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/method/sh.splitAt/#mongodb-method-sh.splitAt">
    <code class="leafygreen-ui-1l06pbn">
     sh.splitAt()
    </code>
   </a>
   command.
  </p>
 </section>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Command Formats
   <a class="headerlink leafygreen-ui-1kepx47" href="#command-formats" title="Permalink to this heading">
    <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
     <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
     </path>
    </svg>
    <div class="css-1btu0w3 evvkmar0" id="command-formats">
    </div>
   </a>
  </h2>
  <p class="leafygreen-ui-1kp3ins">
   To create a chunk split, connect to a
   <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/program/mongos/#mongodb-binary-bin.mongos">
    <code class="leafygreen-ui-1l06pbn">
     mongos
    </code>
   </a>
   instance, and
issue the following command to the
   <code class="leafygreen-ui-1l06pbn">
    admin
   </code>
   database:
  </p>
  <script class="structured_data" type="application/ld+json">
   {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"db.adminCommand( { split: &lt;database&gt;.&lt;collection&gt;,\n                   find: &lt;document&gt; } )","programmingLanguage":"JavaScript"}
  </script>
  <div class="css-16lmvu9">
   <div class="leafygreen-ui-196mwvg">
    <div class="leafygreen-ui-yzcs8i">
     <pre class="leafygreen-ui-11itue3" tabindex="-1"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">db.<span class="lg-highlight-title lg-highlight-function">adminCommand</span>( <!-- -->{ <span class="lg-highlight-attr">split</span>: &lt;<!-- -->database<!-- -->&gt;<!-- -->.<!-- -->&lt;<!-- -->collection<!-- -->&gt;<!-- -->,</td></tr><tr class=""><td class="leafygreen-ui-7razhx">                   <span class="lg-highlight-attr">find</span>: &lt;<span class="lg-highlight-variable lg-highlight-language">document</span>&gt; <!-- -->} )</td></tr></tbody></table></code></pre>
     <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
      <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
       <div class="leafygreen-ui-xhlipt">
        <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
         <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
         </path>
        </svg>
       </div>
      </button>
     </div>
    </div>
   </div>
  </div>
  <p class="leafygreen-ui-1kp3ins">
   Or:
  </p>
  <script class="structured_data" type="application/ld+json">
   {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"db.adminCommand( { split: &lt;database&gt;.&lt;collection&gt;,\n                   middle: &lt;document&gt; } )","programmingLanguage":"JavaScript"}
  </script>
  <div class="css-16lmvu9">
   <div class="leafygreen-ui-196mwvg">
    <div class="leafygreen-ui-yzcs8i">
     <pre class="leafygreen-ui-11itue3" tabindex="-1"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">db.<span class="lg-highlight-title lg-highlight-function">adminCommand</span>( <!-- -->{ <span class="lg-highlight-attr">split</span>: &lt;<!-- -->database<!-- -->&gt;<!-- -->.<!-- -->&lt;<!-- -->collection<!-- -->&gt;<!-- -->,</td></tr><tr class=""><td class="leafygreen-ui-7razhx">                   <span class="lg-highlight-attr">middle</span>: &lt;<span class="lg-highlight-variable lg-highlight-language">document</span>&gt; <!-- -->} )</td></tr></tbody></table></code></pre>
     <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
      <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
       <div class="leafygreen-ui-xhlipt">
        <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
         <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
         </path>
        </svg>
       </div>
      </button>
     </div>
    </div>
   </div>
  </div>
  <p class="leafygreen-ui-1kp3ins">
   Or:
  </p>
  <script class="structured_data" type="application/ld+json">
   {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"db.adminCommand( { split: &lt;database&gt;.&lt;collection&gt;,\n                   bounds: [ &lt;lower&gt;, &lt;upper&gt; ] } )","programmingLanguage":"JavaScript"}
  </script>
  <div class="css-16lmvu9">
   <div class="leafygreen-ui-196mwvg">
    <div class="leafygreen-ui-yzcs8i">
     <pre class="leafygreen-ui-11itue3" tabindex="-1"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">db.<span class="lg-highlight-title lg-highlight-function">adminCommand</span>( <!-- -->{ <span class="lg-highlight-attr">split</span>: &lt;<!-- -->database<!-- -->&gt;<!-- -->.<!-- -->&lt;<!-- -->collection<!-- -->&gt;<!-- -->,</td></tr><tr class=""><td class="leafygreen-ui-7razhx">                   <span class="lg-highlight-attr">bounds</span>: <!-- -->[ &lt;<!-- -->lower<!-- -->&gt;<!-- -->,<!-- --> <!-- -->&lt;<!-- -->upper<!-- -->&gt; <!-- -->] } )</td></tr></tbody></table></code></pre>
     <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
      <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
       <div class="leafygreen-ui-xhlipt">
        <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
         <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
         </path>
        </svg>
       </div>
      </button>
     </div>
    </div>
   </div>
  </div>
  <p class="leafygreen-ui-1kp3ins">
   To create a split for a collection that uses a
   <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/glossary/#std-term-hashed-shard-key">
    hashed shard key
   </a>
   ,
use the
   <code class="leafygreen-ui-1l06pbn">
    bounds
   </code>
   parameter. Do
   <em>
    not
   </em>
   use the
   <code class="leafygreen-ui-1l06pbn">
    middle
   </code>
   parameter for
this purpose.
  </p>
  <div class="leafygreen-ui-1sjx7ru" role="note">
   <h2 class="leafygreen-ui-29m78u">
    Warning
   </h2>
   <div class="leafygreen-ui-9mycqc">
    <p class="leafygreen-ui-1kp3ins">
     Be careful when splitting data in a sharded collection to create
new chunks. When you shard a collection that has existing data,
MongoDB automatically creates chunks to evenly distribute the
collection. To split data effectively in a sharded cluster you must
consider the number of documents in a chunk and the average
document size to create a uniform chunk size. When chunks have
irregular sizes, shards may have an equal number of chunks but have
very different data sizes. Avoid creating splits that lead to a
collection with differently sized chunks.
    </p>
   </div>
  </div>
  <div class="leafygreen-ui-13vw3ie" role="note">
   <h2 class="leafygreen-ui-1fn4p2b">
    Tip
   </h2>
   <h3 class="leafygreen-ui-144d5kf">
    <strong>
     See also:
    </strong>
   </h3>
   <div class="leafygreen-ui-9mycqc">
    <ul class="leafygreen-ui-rioki0">
     <li class="leafygreen-ui-d7p7b6">
      <p class="leafygreen-ui-1kp3ins">
       <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/command/moveChunk/#mongodb-dbcommand-dbcmd.moveChunk">
        <code class="leafygreen-ui-1l06pbn">
         moveChunk
        </code>
       </a>
      </p>
     </li>
     <li class="leafygreen-ui-d7p7b6">
      <p class="leafygreen-ui-1kp3ins">
       <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/command/moveRange/#mongodb-dbcommand-dbcmd.moveRange">
        <code class="leafygreen-ui-1l06pbn">
         moveRange
        </code>
       </a>
      </p>
     </li>
     <li class="leafygreen-ui-d7p7b6">
      <p class="leafygreen-ui-1kp3ins">
       <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/method/sh.moveChunk/#mongodb-method-sh.moveChunk">
        <code class="leafygreen-ui-1l06pbn">
         sh.moveChunk()
        </code>
       </a>
      </p>
     </li>
     <li class="leafygreen-ui-d7p7b6">
      <p class="leafygreen-ui-1kp3ins">
       <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/method/sh.splitAt/#mongodb-method-sh.splitAt">
        <code class="leafygreen-ui-1l06pbn">
         sh.splitAt()
        </code>
       </a>
      </p>
     </li>
     <li class="leafygreen-ui-d7p7b6">
      <p class="leafygreen-ui-1kp3ins">
       <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/method/sh.splitFind/#mongodb-method-sh.splitFind">
        <code class="leafygreen-ui-1l06pbn">
         sh.splitFind()
        </code>
       </a>
      </p>
     </li>
     <li class="leafygreen-ui-d7p7b6">
      <p class="leafygreen-ui-1kp3ins">
       <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
        <span>
         <code class="leafygreen-ui-1l06pbn">
          split
         </code>
        </span>
       </a>
      </p>
     </li>
    </ul>
   </div>
  </div>
 </section>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Examples
   <a class="headerlink leafygreen-ui-1kepx47" href="#examples" title="Permalink to this heading">
    <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
     <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
     </path>
    </svg>
    <div class="css-1btu0w3 evvkmar0" id="examples">
    </div>
   </a>
  </h2>
  <p class="leafygreen-ui-1kp3ins">
   The following sections provide examples of the
   <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
    <span>
     <code class="leafygreen-ui-1l06pbn">
      split
     </code>
    </span>
   </a>
   command.
  </p>
  <section>
   <h3 class="contains-headerlink leafygreen-ui-15ajumo" weight="medium">
    Split a Chunk in Half
    <a class="headerlink leafygreen-ui-1kepx47" href="#split-a-chunk-in-half" title="Permalink to this heading">
     <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
      <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
      </path>
      <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
      </path>
     </svg>
     <div class="css-1btu0w3 evvkmar0" id="split-a-chunk-in-half">
     </div>
    </a>
   </h3>
   <script class="structured_data" type="application/ld+json">
    {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"db.adminCommand( { split : \"test.people\", find : { _id : 99 } } )","programmingLanguage":"JavaScript"}
   </script>
   <div class="css-16lmvu9">
    <div class="leafygreen-ui-196mwvg">
     <div class="leafygreen-ui-1b1bvay">
      <pre class="leafygreen-ui-1q4bxgx" tabindex="0"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">db.<span class="lg-highlight-title lg-highlight-function">adminCommand</span>( <!-- -->{ <!-- -->split <!-- -->: <span class="lg-highlight-string">"test.people"</span>, <!-- -->find <!-- -->: <!-- -->{ <!-- -->_id <!-- -->: <span class="lg-highlight-number">99</span> } } )</td></tr></tbody></table></code></pre>
      <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
       <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
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          </path>
         </svg>
        </div>
       </button>
      </div>
     </div>
    </div>
   </div>
   <p class="leafygreen-ui-1kp3ins">
    The
    <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
     <span>
      <code class="leafygreen-ui-1l06pbn">
       split
      </code>
     </span>
    </a>
    command identifies the chunk in the
    <code class="leafygreen-ui-1l06pbn">
     people
    </code>
    collection of the
    <code class="leafygreen-ui-1l06pbn">
     test
    </code>
    database, that holds documents that match
    <code class="leafygreen-ui-1l06pbn">
     {
_id : 99 }
    </code>
    .
    <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
     <span>
      <code class="leafygreen-ui-1l06pbn">
       split
      </code>
     </span>
    </a>
    does not require that a match exist, in order
to identify the appropriate chunk. Then the command splits it into two
chunks of equal size.
   </p>
   <div class="leafygreen-ui-15mdk4" role="note">
    <h2 class="leafygreen-ui-6n7b7d">
     Note
    </h2>
    <div class="leafygreen-ui-9mycqc">
     <p class="leafygreen-ui-1kp3ins">
      <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
       <span>
        <code class="leafygreen-ui-1l06pbn">
         split
        </code>
       </span>
      </a>
      creates two equal chunks by range as
opposed to size, and does not use the selected point as a boundary for
the new chunks.
     </p>
    </div>
   </div>
  </section>
  <section>
   <h3 class="contains-headerlink leafygreen-ui-15ajumo" weight="medium">
    Define an Arbitrary Split Point
    <a class="headerlink leafygreen-ui-1kepx47" href="#define-an-arbitrary-split-point" title="Permalink to this heading">
     <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
      <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
      </path>
      <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
      </path>
     </svg>
     <div class="css-1btu0w3 evvkmar0" id="define-an-arbitrary-split-point">
     </div>
    </a>
   </h3>
   <p class="leafygreen-ui-1kp3ins">
    To define an arbitrary split point, use the following form:
   </p>
   <script class="structured_data" type="application/ld+json">
    {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"db.adminCommand( { split : \"test.people\", middle : { _id : 99 } } )","programmingLanguage":"JavaScript"}
   </script>
   <div class="css-16lmvu9">
    <div class="leafygreen-ui-196mwvg">
     <div class="leafygreen-ui-1b1bvay">
      <pre class="leafygreen-ui-1q4bxgx" tabindex="0"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">db.<span class="lg-highlight-title lg-highlight-function">adminCommand</span>( <!-- -->{ <!-- -->split <!-- -->: <span class="lg-highlight-string">"test.people"</span>, <!-- -->middle <!-- -->: <!-- -->{ <!-- -->_id <!-- -->: <span class="lg-highlight-number">99</span> } } )</td></tr></tbody></table></code></pre>
      <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
       <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
        <div class="leafygreen-ui-xhlipt">
         <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
          <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
          </path>
         </svg>
        </div>
       </button>
      </div>
     </div>
    </div>
   </div>
   <p class="leafygreen-ui-1kp3ins">
    The
    <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
     <span>
      <code class="leafygreen-ui-1l06pbn">
       split
      </code>
     </span>
    </a>
    command identifies the chunk in the
    <code class="leafygreen-ui-1l06pbn">
     people
    </code>
    collection of the
    <code class="leafygreen-ui-1l06pbn">
     test
    </code>
    database, that would hold documents
matching the query
    <code class="leafygreen-ui-1l06pbn">
     { _id : 99 }
    </code>
    .
    <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
     <span>
      <code class="leafygreen-ui-1l06pbn">
       split
      </code>
     </span>
    </a>
    does not
require that a match exist, in order to identify the appropriate
chunk. Then the command splits it into two chunks, with the matching
document as the lower bound of one of the split chunks.
   </p>
   <p class="leafygreen-ui-1kp3ins">
    This form is typically used when
    <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/glossary/#std-term-pre-splitting">
     pre-splitting
    </a>
    data in a
collection.
   </p>
  </section>
  <section>
   <h3 class="contains-headerlink leafygreen-ui-15ajumo" weight="medium">
    Split a Chunk Using Values of a Hashed Shard Key
    <a class="headerlink leafygreen-ui-1kepx47" href="#split-a-chunk-using-values-of-a-hashed-shard-key" title="Permalink to this heading">
     <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
      <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
      </path>
      <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
      </path>
     </svg>
     <div class="css-1btu0w3 evvkmar0" id="split-a-chunk-using-values-of-a-hashed-shard-key">
     </div>
    </a>
   </h3>
   <p class="leafygreen-ui-1kp3ins">
    This example uses the
    <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/glossary/#std-term-hashed-shard-key">
     hashed shard key
    </a>
    <code class="leafygreen-ui-1l06pbn">
     userid
    </code>
    in a
    <code class="leafygreen-ui-1l06pbn">
     people
    </code>
    collection of a
    <code class="leafygreen-ui-1l06pbn">
     test
    </code>
    database. The following command
uses an array holding two single-field documents to represent the
minimum and maximum values of the hashed shard key to split the chunk:
   </p>
   <script class="structured_data" type="application/ld+json">
    {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"db.adminCommand( { split: \"test.people\",\n                  bounds : [ { userid: NumberLong(\"-5838464104018346494\") },\n                             { userid: NumberLong(\"-5557153028469814163\") }\n             ] } )","programmingLanguage":"JavaScript"}
   </script>
   <div class="css-16lmvu9">
    <div class="leafygreen-ui-196mwvg">
     <div class="leafygreen-ui-1b1bvay">
      <pre class="leafygreen-ui-11itue3" tabindex="0"><code class="lg-highlight-hljs-light javascript leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">db.<span class="lg-highlight-title lg-highlight-function">adminCommand</span>( <!-- -->{ <span class="lg-highlight-attr">split</span>: <span class="lg-highlight-string">"test.people"</span>,</td></tr><tr class=""><td class="leafygreen-ui-7razhx">                  <!-- -->bounds <!-- -->: <!-- -->[ <!-- -->{ <span class="lg-highlight-attr">userid</span>: <span class="lg-highlight-title lg-highlight-class">NumberLong</span>(<span class="lg-highlight-string">"-5838464104018346494"</span>) }<!-- -->,</td></tr><tr class=""><td class="leafygreen-ui-7razhx">                             <!-- -->{ <span class="lg-highlight-attr">userid</span>: <span class="lg-highlight-title lg-highlight-class">NumberLong</span>(<span class="lg-highlight-string">"-5557153028469814163"</span>) }</td></tr><tr class=""><td class="leafygreen-ui-7razhx">             ] } )</td></tr></tbody></table></code></pre>
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          <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
          </path>
         </svg>
        </div>
       </button>
      </div>
     </div>
    </div>
   </div>
   <div class="leafygreen-ui-15mdk4" role="note">
    <h2 class="leafygreen-ui-6n7b7d">
     Note
    </h2>
    <div class="leafygreen-ui-9mycqc">
     <p class="leafygreen-ui-1kp3ins">
      MongoDB uses the 64-bit
      <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="https://www.mongodb.com/docs/mongodb-shell/reference/data-types/#std-label-shell-type-long" target="_self">
       <span>
        NumberLong
       </span>
      </a>
      type to represent the hashed value.
     </p>
    </div>
   </div>
   <p class="leafygreen-ui-1kp3ins">
    Use
    <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/method/sh.status/#mongodb-method-sh.status">
     <code class="leafygreen-ui-1l06pbn">
      sh.status()
     </code>
    </a>
    to see the existing bounds of the shard keys.
   </p>
  </section>
 </section>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Metadata Lock Error
   <a class="headerlink leafygreen-ui-1kepx47" href="#metadata-lock-error" title="Permalink to this heading">
    <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
     <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
     </path>
    </svg>
    <div class="css-1btu0w3 evvkmar0" id="metadata-lock-error">
    </div>
   </a>
  </h2>
  <p class="leafygreen-ui-1kp3ins">
   If another process, such as a balancer
process, changes metadata while
   <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
    <span>
     <code class="leafygreen-ui-1l06pbn">
      split
     </code>
    </span>
   </a>
   is running, you may
see a
   <code class="leafygreen-ui-1l06pbn">
    metadata lock error
   </code>
   .
  </p>
  <script class="structured_data" type="application/ld+json">
   {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"errmsg: \"The collection's metadata lock is already taken.\""}
  </script>
  <div class="css-16lmvu9">
   <div class="leafygreen-ui-196mwvg">
    <div class="leafygreen-ui-yzcs8i">
     <pre class="leafygreen-ui-1q4bxgx" tabindex="-1"><code class="lg-highlight-hljs-light none leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">errmsg: "The collection's metadata lock is already taken."</td></tr></tbody></table></code></pre>
     <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
      <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
       <div class="leafygreen-ui-xhlipt">
        <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
         <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
         </path>
        </svg>
       </div>
      </button>
     </div>
    </div>
   </div>
  </div>
  <p class="leafygreen-ui-1kp3ins">
   This message indicates that the split has failed with no side
effects. Retry the
   <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-dbcommand-dbcmd.split" target="_self">
    <span>
     <code class="leafygreen-ui-1l06pbn">
      split
     </code>
    </span>
   </a>
   command.
  </p>
 </section>
</section>
