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15.15.3. Creating Index Keys

As part of every table-write operation (INSERT, UPDATE, DELETE), the storage engine is required to update its internal index information.

The method used to update indexes will vary from storage engine to storage engine, depending on the method used to store the index.

In general, the storage engine will have to use row information passed in functions such as write_row(), delete_row(), and update_row() in combination with index information for the table to determine what index data needs to be modified, and make the needed changes.

The method of associating an index with its row will depend on your storage approach. The BerkeleyDB storage engine stores the primary key of the row in the index while other storage engines often store the row offset.


 
 
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