DBCC CHECKDB has the ability to perform parallel checking of objects. However, it absolutely depends on the edition of SQL Server, it only happens when using enterprise edition.
Let’s see this in action. I propose the following tests for this blog post:
I could not read my error log on one of my local SQL Servers, when I executed the following code:
EXEC sp_readerrorlog
I received the below:
Msg 22004, Level 16, State 1, Line 2 Failed to open loopback connection. Please see event log for more information. Msg 22004, Level 16, State 1, Line 2 Error log location not found.
If you know about DBCC CHECKDB then most likely you will know about DBCC CHECKTABLE. Quite simply this command performs primitive system-catalog consistency checks, per-table consistency checks on the single table specified, and cross-table consistency checks on indexed views that reference the specified table. (Page 899 Microsoft SQL Server Internals 2012, Chapter 14, Page 899, Paul Randal)
With Halloween around the corner what better topic to discuss than phantom reads. A phantom read occurs when rows have been inserted after a read operation and becomes visible in a follow-up read operation within the same transaction.
So I had a corruption issue and I was thinking about running repair but I wanted to know what would potentially get deleted.
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