You can defragment a database table using Schema Tools. Defragmentation optimizes space used by the Pega Platform internal database tables to improve performance.
This operation can take some time to complete. After initiating an operation, you can view progress and verify completion by refreshing the landing page and clicking the History tab for the table.
In the header of Dev Studio, click.
Select the table that you want to defragment.
Click Defragment table in the right pane.