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My job is to create and store reports created from log table. Application is in production for a few years now. After a while as log grows report generation becomes slower. Our solution was to delete some records from a log table after a while. I have the source code of application and I need to make log last longer before deletion , or if possible make reports generate faster.

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Best idea I know of is to keep your log in multiple tables. I guess you need to do a report only for defined time scope. Keep fresh data in one table and older data in different table. Your report generation time will be reduced.
Try pre-processing the data and then keeping only the report results vs complete data.
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