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12 Dell EMC PowerVault ME4 Series and Microsoft Exchange Server 2016 | 3925-BP-EX
2.9.2 Online database scanning (checksumming)
The checksumming process can run in two different modes on the active database copies:
Default option: This has checksumming run in the background 24x7. This option is intended for most
databases which can require time periods to complete a checksum. Exchange scans the full database no
more than once a day and will generate an alert if it does not finish scanning within seven days.
Second option: This runs as the last task in the custom-scheduled mailbox database maintenance process.
The amount of time it runs can be configured by altering the schedule calendar, which is recommended for
databases that are less than 500 GB in size. This allows these databases to finish scanning quickly, having
less impact to the continuous BDM process. The schedule can be modified in the database properties under
the maintenance section.
For more information, see technet.microsoft.com.
2.9.3 Database fragmentation
Defragmentation of the information storage database occurs after information within the database is deleted,
leaving a data-free page still within the file. Defragmentation has performance implications if not addressed
properly, so it is advantageous to use the built-in information store maintenance.
Fragmentation is limited and contiguity is maintained through the background processes that run to manage
the databases.