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SQL Server 2008
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Will shrinking the transaction log reduce the...
Will shrinking the transaction log reduce the size of a full backup?
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Jon.Morisi
Jon.Morisi
Posted Wednesday, October 10, 2012 12:39 PM
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Will shrinking the transaction log reduce the size of a full backup?
Post #1371082
GSquared
GSquared
Posted Wednesday, October 10, 2012 12:42 PM
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Depends on what you mean by "shrinking". If you mean truncating it, to "shrink" the data in it, then yes. If you mean shrinking the file but leaving the data alone (just getting rid of some free space in it), then no.
Keep in mind that truncating the transaction log is almost always a really, really bad idea.
- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
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Post #1371084
Jon.Morisi
Jon.Morisi
Posted Wednesday, October 10, 2012 2:00 PM
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OK that's what I thought. The T-log grew due to a bad query so now it's >1% used. I was hoping I could shrink to reduce the backup size. Oh well, I'll have to get the vendor to archive some data.
Thanks!
Post #1371106
Jeff Moden
Jeff Moden
Posted Wednesday, October 10, 2012 9:25 PM
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Jon.Morisi (10/10/2012)
OK that's what I thought. The T-log grew due to a bad query so now it's >1% used. I was hoping I could shrink to reduce the backup size. Oh well, I'll have to get the vendor to archive some data.
Thanks!
When's the last time you did a full rebuild of all indexes?
--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 #1371192
Jon.Morisi
Jon.Morisi
Posted Wednesday, October 10, 2012 9:58 PM
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They're done weekly. I'm actually working through testing ola's scripts on it.
Post #1371197
GilaMonster
GilaMonster
Posted Thursday, October 11, 2012 2:14 AM
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No, neither shrinking the log nor explicitly truncating it will reduce database backup size. The portion of the log included in a full backup is usually just from the start of the oldest open transaction at the point the full backup starts until the end of the backup (can be more if there's replication, CDC or async mirroring)
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 #1371266
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