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September 2015

Status of DBCC CheckDB

So you are checking your database with DBCC CheckDB and of course if you are like me you use the WITH NO_INFOMSGS parameter. But it turns out that CheckDB is taking longer to run that you expected, and you want to check and see what table is currently being checked.

Here is a quick SQL Script that I use to find the current table that is being checked by DBCC CheckDB

use [your database];
go

-- use this to find the session id of DBCC CheckDB
SELECT session_id, start_time, command, percent_complete, total_elapsed_time,
       estimated_completion_time, database_id, user_id, last_wait_type
  FROM sys.dm_exec_requests
 CROSS APPLY sys.dm_exec_sql_text(sql_handle)
 WHERE command like '%DBCC%';  

DECLARE @sessionID as integer = 53; -- enter the session ID of DBCC CheckDB Here

SELECT name, schema_id, type_desc
  FROM sys.objects
 WHERE object_id = (SELECT TOP 1 resource_associated_entity_id
                      FROM sys.dm_tran_locks
					 WHERE request_session_id = @sessionID
					   AND resource_type = 'OBJECT'
					   AND resource_associated_entity_id <> 50);



status of dbcc checkdb


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DBCC CheckDB All Databases

If you use the SQL Server maintenance plans to run DBCC Check DB, you are not allowed to include TempDB in your DBCC CheckDB sequence. For a while I was using maintenance plans, and ending up adding a separate job step to run TSQL to just check TempDB.

Rather than using two different steps, the regular maintenance plan, and a special step for Temp DB, I have instead dumped the regular maintenance plan step, and just used the following TSQL code to run DBCC CheckDB against all databases on the SQL Server.

Option 1: DBCC CheckDB All Databases using sp_msforeachdb

I have included Option 2 below since there are some pretty serious flaws in the sp_msforeachdb script as shown in option 1, specifically sp_msforeachdb will occasionally skip databases. It also has trouble with databases created with certain characters.  Anyway if you want it, here is, but I would recommend paging down to Option 2 which is much more reliable. I would like to thank Patrick Flynn who showed me the flaws in sp_msforeachdb.

The stored procedure sp_msforeachdb takes a parameter of query that will get run against all databases on your SQL Server Instance.


EXEC sp_msforeachdb 'DBCC CHECKDB(''?'') WITH NO_INFOMSGS;';

You can set it up as a maintenance plan like this:

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