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Resetting DMVs
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Resetting DMVs
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Steve Jones - SSC Editor
Steve Jones - SSC Editor
Posted Wednesday, March 13, 2013 12:13 AM
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Comments posted to this topic are about the item
Resetting DMVs
Follow me on Twitter:
@way0utwest
Forum Etiquette: How to post data/code on a forum to get the best help
Post #1430231
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
Posted Wednesday, March 13, 2013 2:20 AM
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I agree wholeheartedly with this post.
Trying to troubleshoot a crashed SQL Server instance, without DMV data, is an extremely difficult task.
____________________________________________
Space, the final frontier? not any more...
All limits henceforth are self-imposed.
“libera tute vulgaris ex”
Post #1430249
David.Poole
David.Poole
Posted Wednesday, March 13, 2013 2:48 AM
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Well said. Index usage stats are particularly revealing.
I'm in the process of deprecating and consolidating systems and key weapon in the arsenal is being able to proove categorically that the data has not been read in any way other than by system processes.
LinkedIn Profile
Post #1430255
Gary Varga
Gary Varga
Posted Wednesday, March 13, 2013 3:17 AM
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I agree. Also, default to save and make it configurable as those databases which may require it to be off are exactly the ones with a professional DBA to evaluate the choice.
Gaz
-- Stop your grinnin' and drop your linen...they're everywhere!!!
Post #1430263
Simon D Richards
Simon D Richards
Posted Wednesday, March 13, 2013 5:24 AM
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This would work, especially if there is a default retention time for the data, any data beyond that would be cleared out by a garbage collector, and any databases that need extra special trouble shooting can be extended, for analysis.
This would also save all the un-managed systems that exist out there from becoming bloated with months of unused dmv data.
Post #1430311
Jeff Moden
Jeff Moden
Posted Wednesday, March 13, 2013 5:50 AM
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That got me thinking. Why is this data removed? I'm sure some of the data is stored in memory and automatically reset, but is this the best way to handle this data? Wouldn't it be better to persist this data and allow the DBA to reset values when they were ready?
BWAA-HAA!!! I really have to laugh at this one. Welcome to the nature of "Agile" programming.
If enough people bitch about it, maybe they'll make it so 2 or 3 revs from now. Hmmm... ironically, that would put it out around 2020, the year of "perfect vision".
--Jeff Moden
"
RBAR
is pronounced "ree-bar" and is a "Modenism" for "
R
ow-
B
y-
A
gonizing-
R
ow".
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."
For better, quicker answers on T-SQL questions, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537/
For better answers on performance questions, click on the following...
http://www.sqlservercentral.com/articles/SQLServerCentral/66909/
Post #1430326
Stephen_W_Dodd
Stephen_W_Dodd
Posted Wednesday, March 13, 2013 7:20 AM
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Couldn't you accomplish the same thing with extended events?
Post #1430371
TravisDBA
TravisDBA
Posted Wednesday, March 13, 2013 8:02 AM
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Because these DMV's are directly tied into the Performance Dashboards that people use everyday in order to get an updated POINT IN TIME look at their SQL Server and their databases. Secondly, these DMV's just don't have enough cache available for historical performance, that's why. Even if the cache was large enough, as you stated there would probably be performance issues that would result from doing that anyway. However, you can set up a "DMV repository" by just creating specific jobs to warehouse all DMV results in a specific repository at particular intervals that could be stored in msdb or somewhere else like a DBA Utility database for example. Here is a link that will give you a good starting point for doing just that:
http://www.sqlserverpath.org/2012/03/31/better-dba-dashboards-using-dmv-monitors-14/
"Technology is a weird thing. It brings you great gifts with one hand, and it stabs you in the back with the other. ...
"
Post #1430404
aleksey2001
aleksey2001
Posted Wednesday, March 13, 2013 10:49 AM
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Microsoft will implement it eventually. Just like Oracle did few years ago. Oracle has a separate AWR repository to store this type of information. Just wait =)
Post #1430526
SQLRNNR
SQLRNNR
Posted Wednesday, March 13, 2013 12:28 PM
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Jeff Moden (3/13/2013)
That got me thinking. Why is this data removed? I'm sure some of the data is stored in memory and automatically reset, but is this the best way to handle this data? Wouldn't it be better to persist this data and allow the DBA to reset values when they were ready?
BWAA-HAA!!! I really have to laugh at this one. Welcome to the nature of "Agile" programming.
If enough people bitch about it, maybe they'll make it so 2 or 3 revs from now. Hmmm... ironically, that would put it out around 2020, the year of "perfect vision".
+1
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
Posting Data Etiquette - Jeff Moden
Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp
Post #1430571
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