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About Indexes. Indexes are optional structures associated with tables and clusters that allow SQL statements to execute more quickly against a table. Just as the index in this manual helps you locate information faster than if there were no index, an Oracle Database index provides a faster access path to table data.
File Indexing: All modern operating systems include file-indexing services. This is a process that crawls through your entire hard drive, examining each file â and the text inside it â and making a database. When you use your operating systemâs search feature, you get instant search results from the database.