user3667: For example for a 1 MB block, does the extra Tx index database take up another 100 kB on average?
And a follow-up: once my node has completed -reindex after setting txindex=1 can I COPY the blockchain AND the TX index database together to other nodes? I know the blockchain can be copied but I'm not sure if the new node needs to reindex the blockchain itself or if the index database copies over as well.

user35618: I just reindexed after setting txindex=1. My data directory increased in size about 3GB, but it seems like it might be saving data in another location since moving the data directory to other nodes is asking me to reindex.

user208: The total extra size is around 27GB as of June 2020. You can check by looking at the size of the $DATADIR/blocks/index directory.
If you copy that directory, you'll copy the index with it.

Historic data:




Date
GB
Reference




2016-11-18
7
original answer


2017-05-08
11
ens


2019-07-16
21
Vasil Toshkov


2020-06-14
27
Anonymous




3667: <p>For example for a 1 MB block, does the extra Tx index database take up another 100 kB on average?</p>

<p>And a follow-up: once my node has completed <code>-reindex</code> after setting <code>txindex=1</code> can I COPY the blockchain AND the TX index database together to other nodes? I know the blockchain can be copied but I'm not sure if the new node needs to reindex the blockchain itself or if the index database copies over as well.</p>
 35618: <p>I just reindexed after setting txindex=1. My data directory increased in size about 3GB, but it seems like it might be saving data in another location since moving the data directory to other nodes is asking me to reindex.</p>
 208: <p>The total extra size is around 27GB as of June 2020. You can check by looking at the size of the <code>$DATADIR/blocks/index</code> directory.</p>
<p>If you copy that directory, you'll copy the index with it.</p>
<hr />
<p>Historic data:</p>
<div class="s-table-container">
<table class="s-table">
<thead>
<tr>
<th style="text-align: right;">Date</th>
<th style="text-align: right;">GB</th>
<th>Reference</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: right;">2016-11-18</td>
<td style="text-align: right;">7</td>
<td>original answer</td>
</tr>
<tr>
<td style="text-align: right;">2017-05-08</td>
<td style="text-align: right;">11</td>
<td><a href="https://bitcoin.stackexchange.com/users/43135/ens">ens</a></td>
</tr>
<tr>
<td style="text-align: right;">2019-07-16</td>
<td style="text-align: right;">21</td>
<td><a href="https://bitcoin.stackexchange.com/users/97001/vasil-toshkov">Vasil Toshkov</a></td>
</tr>
<tr>
<td style="text-align: right;">2020-06-14</td>
<td style="text-align: right;">27</td>
<td><a href="https://bitcoin.stackexchange.com/users/24925/anonymous">Anonymous</a></td>
</tr>
</tbody>
</table>
</div>