Hello, the DB maintenance does a lot of things, but in general the main task is to aggregate statistic data according to the polling settings and deleting the old data. When enabled, the DB maintenance can also perform SQL indexes rebuilt. Periodic run is recommended to keep your database in good condition (smaller tables are much easier to query, and so on). For more information, please reffer to the admin guide (e.g. here at page 341 http://www.solarwinds.com/documentation/Orion/docs/OrionAdministratorGuide.pdf)
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