DBCC Checks For Large Databases

David Alcock gives a couple methods for performing consistency checks against gigantic databases:

One way to achieve this is to  split up the consistency checks covering smaller objects and native functionality allows us to do just that, we can perform the checks at the table level or indeed if they are implemented at the filegroup level too using the DBCC CHECKFILEGROUP command.

How to go about this is pretty straightforward; take the list of tables, split them into equal(ish) groups. The groups now form a pool of objects and within a nightly (or daily) window perform the check on each object in the pool. This effectively spreads a database consistency check over multiple days, you avoid the impact on production activities but also ensure all objects are checked over time.

Read on for the solution.  I’m also a big fan of Minion CheckDB, which is designed to handle this type of scenario as well.

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