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(Bob Brown)
(Bob Brown)
Posted Tuesday, October 09, 2012 7:05 AM
Say Hey Kid
Group: General Forum Members
Last Login: Friday, April 19, 2013 10:27 AM
Points: 690,
Visits: 1,100
Thanks.
Post #1370374
sestell1
sestell1
Posted Tuesday, October 09, 2012 7:21 AM
SSC Eights!
Group: General Forum Members
Last Login: Today @ 10:09 AM
Points: 832,
Visits: 1,206
Very interesting, thanks for the question!
Post #1370387
arthurolcot
arthurolcot
Posted Tuesday, October 09, 2012 7:23 AM
SSCommitted
Group: General Forum Members
Last Login: Yesterday @ 9:04 AM
Points: 1,722,
Visits: 1,404
Nice, learnt something new today. Thanks.
Post #1370389
KWymore
KWymore
Posted Tuesday, October 09, 2012 8:40 AM
SSCrazy
Group: General Forum Members
Last Login: Today @ 8:52 AM
Points: 2,574,
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Thanks for the question!
Post #1370427
saurabh.x.sinha
saurabh.x.sinha
Posted Tuesday, October 09, 2012 8:59 AM
Grasshopper
Group: General Forum Members
Last Login: Friday, May 17, 2013 7:28 AM
Points: 19,
Visits: 81
Summary !!
By default, SQL Server updates index statistics automatically. Frequency of automatic updates depends on number of rows in the table. If you allow SQL Server to update statistics automatically it will use the following rules:
1. If a table has 6 or fewer rows, statistics will be updated after 6 changes
2. If a table has 500 or fewer rows, statistics will be updated after 500 changes
3. If a table has more than 500 rows, statistics will be updated after 20% of the total rows plus 500 rows are changed (INSERTED, UPDATED or DELETED)
4. SQL Server uses the rowmodctr column of the sysindexes table to determine the number of changes since the last update of statistics
Post #1370441
LadyRuna
LadyRuna
Posted Tuesday, October 09, 2012 9:03 AM
SSC Eights!
Group: General Forum Members
Last Login: Today @ 9:16 AM
Points: 811,
Visits: 170
Thanks for posting this! I'd been hoping that there was a secret way of forcing SQL to automatically update stats more frequently. Our usual solution has always been to create a SQL job that runs update stats frequently... but this trace flag may be just the trick. I'll try it out on a test server....
Post #1370444
asifkareem
asifkareem
Posted Tuesday, October 09, 2012 10:46 AM
SSChasing Mays
Group: General Forum Members
Last Login: Yesterday @ 3:07 PM
Points: 606,
Visits: 136
Thanks For good Question, its allow reading to different Article before you are going to attempt. but at the end +1
Post #1370485
SQLRNNR
SQLRNNR
Posted Tuesday, October 09, 2012 12:38 PM
SSCoach
Group: General Forum Members
Last Login: Yesterday @ 1:07 PM
Points: 18,733,
Visits: 12,332
saurabh.x.sinha (10/9/2012)
Summary !!
By default, SQL Server updates index statistics automatically. Frequency of automatic updates depends on number of rows in the table. If you allow SQL Server to update statistics automatically it will use the following rules:
1. If a table has 6 or fewer rows, statistics will be updated after 6 changes
2. If a table has 500 or fewer rows, statistics will be updated after 500 changes
3. If a table has more than 500 rows, statistics will be updated after 20% of the total rows plus 500 rows are changed (INSERTED, UPDATED or DELETED)
4. SQL Server uses the rowmodctr column of the sysindexes table to determine the number of changes since the last update of statistics
FWIW - In SQL 2008 and up it uses colmodctr to track those changes.
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 #1370537
Miles Neale
Miles Neale
Posted Wednesday, October 10, 2012 3:51 PM
SSCommitted
Group: General Forum Members
Last Login: Yesterday @ 9:51 AM
Points: 1,891,
Visits: 936
I answered with hope there was such a thing and won. Excellent!
Not all gray hairs are Dinosaurs!
Post #1371147
Britt Cluff
Britt Cluff
Posted Wednesday, October 24, 2012 8:25 PM
SSCommitted
Group: General Forum Members
Last Login: Wednesday, October 24, 2012 8:17 PM
Points: 1,558,
Visits: 247
Good question. Thanks for submitting.
http://brittcluff.blogspot.com/
Post #1376751
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