DBCC CHECKALLOC is a database console command (DBCC) in Microsoft SQL Server that can be used to check the allocation and structural integrity of the data and index pages in a database. Checking the allocation and structural integrity of the pages can be useful for identifying and correcting issues with the database that could cause errors or performance issues.
To use DBCC CHECKALLOC, you must specify the name of the database you want to check the allocation and structural integrity of the pages for. You can also specify the NOINDEX option to skip checking the indexes, and the FAST option to perform a minimal check of the pages.
Here is an example of how to use DBCC CHECKALLOC to check the allocation and structural integrity of the pages in the “MyDatabase” database:
-- Check the allocation and structural integrity of the pages in the "MyDatabase" database
DBCC CHECKALLOC ('MyDatabase');
Here is an example of how to use DBCC CHECKALLOC to check the allocation and structural integrity of the pages in the “MyDatabase” database, but skip checking the indexes:
-- Check the allocation and structural integrity of the pages in the "MyDatabase" database, but skip checking the indexes
DBCC CHECKALLOC ('MyDatabase', NOINDEX);
Here is an example of how to use DBCC CHECKALLOC to perform a minimal check of the pages in the “MyDatabase” database:
-- Perform a minimal check of the pages in the "MyDatabase" database
DBCC CHECKALLOC ('MyDatabase', FAST);
The output of DBCC CHECKALLOC will be a list of any issues found with the allocation or structural integrity of the pages in the database.
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