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version_ghost_record_count


version_ghost_record_count

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Sean Pearce
Sean Pearce
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Hi,

I understand that [version_ghost_record_count] as retrieved from sys.dm_db_index_physical_stats shows the ghost records count sustained by a snapshot isolation transaction in an allocation unit.

My question is this:
I am seeing version ghost records in one of my databases but the database has Snapshot Isolation switched off. Is this possible?



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GilaMonster
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Sean Pearce (9/13/2013)
I am seeing version ghost records in one of my databases but the database has Snapshot Isolation switched off. Is this possible?


Yes. :-D

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Sean Pearce
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Thanks Gail. And the reason is?



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The snapshot isolations aren't the only things that use versioning. Off the top of my head online index rebuilds use versioning and triggers use the row version store. I know there's more things, but can't remember right now.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
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Sean Pearce
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Do you think SCOPE_IDENTITY() could be one of the reasons?



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No.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass


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