Check allocation

Check Allocation corresponds to the dbcc checkalloc command. This command checks the selected database to see that:

All pages are correctly allocated
No page is allocated that is not used
No page is used that is not allocated

To fix allocation errors, check Fix allocation errors. Adaptive Server automatically places the database in single-user mode while executing dbcc checkalloc and then returns the database to multiple-user mode when processing is complete.

The report shows the amount of space allocated and used by each database table. The output consists of a block of data for each table, including the system tables, and the indexes on each table. For each table or index, it reports the number of pages and extents (8-page blocks of allocated space) used.

Because this dbcc option uses a large amount of overhead, run it in periods of low activity.