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How to Diagnose and Fix Wait Locks


How to Diagnose and Fix Wait Locks

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Scorpion_66
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Comments posted to this topic are about the content posted at http://www.sqlservercentral.com/columnists/ckirkwood/wait_types.asp



ckempste
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Fantastic article.. thanks for the insight into some of the lower level commands, most appreciated.


Chris Kempster
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Author of "SQL Server Backup, Recovery & Troubleshooting"
Author of "SQL Server 2k for the Oracle DBA"
joachim.verhagen
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Great article.
Can you tell what to do with the resultset of dbcc sqlperf(waitstats)
I saw that it is accumulative, so you have to take the up time into account.
But what is the unit of measurement and the difference between "wait time" and "signal wait time"?



Klaas-Jan
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Good article , nice to have all waittypes described



skasarla
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Great Article and very good insight into tackling the lock waits in a transactional system.



Scorpion_66
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Yes, joachim.verhagen, it is cumulative. The measurement is in milliseconds. The difference between Wait time and Signal Wait time is basically the difference in waiting on something and communicating about waiting on something, to put it in simple terms.



ckempste
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Hi all

Some things to remember..

a) measures physical io, not logical, flush buffers when testing
b) force checkpoints when testing writes to force log flush

before trying it all on prod

Cheers

Ck


Chris Kempster
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Author of "SQL Server Backup, Recovery & Troubleshooting"
Author of "SQL Server 2k for the Oracle DBA"
Prakash Heda
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Best diagnone i have ever seen. No one can beet this..............
Thumbs up............Prakash

Prakash

Prakash Heda
Lead DBA Team - www.sqlfeatures.com
Video sessions on Performance Tuning and SQL 2012 HA
Scorpion_66
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I'm blown away by the responses to my article, and very much appreciate the comments posted, but does anyone know anything about the waits I didn't talk about. I would very much like to "fill in the gaps" so to speak. What I have is simply what I've garnered over the years, and to date, I have been unsuccessful in ever finding any real documentation on any of the ones not in BOL.



Edited by - Scorpion_66 on 11/28/2002 9:44:59 PM



Yukas
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This must be in BOL IMUO (In My UNHonest Opinion)



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