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SQL Server 2008
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SQL Server 2008 Administration
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Understanding Latches\Locks
Understanding Latches\Locks
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SQLSACT
SQLSACT
Posted Wednesday, August 15, 2012 8:32 AM
Ten Centuries
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Last Login: Yesterday @ 8:22 AM
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Hi All
I'm trying to understand Latch\Lock Waits in SQL Server
If I am seeing waits with a wait type of %latch%
Does this mean that a process is waiting to place a Latch on a resource or is that a process is waiting on a resource that currently has a latch on it?
If I am seeing waits with a wait type of %LCK%
Does this mean that a process is waiting to place a Lock on a resource or is that a process is waiting on a resource that currently has a Lock on it?
I'm struggling to understand this
Thanks
Post #1345301
GilaMonster
GilaMonster
Posted Wednesday, August 15, 2012 9:30 AM
SSC-Dedicated
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Latch waits means the process has requested a latch on some structure and is waiting for the latch to be granted
Lock waits means the process has requested a lock on some structure and is waiting for the lock to be granted
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
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
Post #1345348
SQLSACT
SQLSACT
Posted Wednesday, August 15, 2012 10:55 AM
Ten Centuries
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GilaMonster (8/15/2012)
Latch waits means the process has requested a latch on some structure and is waiting for the latch to be granted
Lock waits means the process has requested a lock on some structure and is waiting for the lock to be granted
Thanks
The cause of the actual wait could be anything, right? It doesn't mean that something already has a latch on the resource and therefore other processes have to wait to put a latch on the same resource. Is this right?
Post #1345403
GilaMonster
GilaMonster
Posted Wednesday, August 15, 2012 10:59 AM
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No, it means exactly that.
Latch waits will be because another process has an incompatible latch already granted (usually, there are other latch waits for other reasons)
Lock waits will be because another process has an incompatible lock already granted.
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
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
Post #1345405
SQLSACT
SQLSACT
Posted Wednesday, August 15, 2012 12:40 PM
Ten Centuries
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GilaMonster (8/15/2012)
No, it means exactly that.
Latch waits will be because another process has an incompatible latch already granted (usually, there are other latch waits for other reasons)
Lock waits will be because another process has an incompatible lock already granted.
Thanks
there are other latch waits for other reasons
Is this where PageIOLatches come in?
Post #1345467
GilaMonster
GilaMonster
Posted Wednesday, August 15, 2012 1:01 PM
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Last Login: Yesterday @ 4:08 PM
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Mostly, yes.
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
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
Post #1345489
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