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SQL Server 2005
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Administering
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HELP= Rebuild index & Update STATISTICS
HELP= Rebuild index & Update STATISTICS
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hydbadrose
hydbadrose
Posted Thursday, March 18, 2010 3:01 PM
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Please advise, when you rebuild indexes if suppose the job failed due to some reason such as power outage, etc., what happens to the indexes? Does it get wiped from database?
Same question for update stat, what happens to statistics if during the execution if there is a power outage or job fails. Does the stats gets wiped from database? Please advise how it works. Thanks
Post #885932
Perry Whittle
Perry Whittle
Posted Thursday, March 18, 2010 4:07 PM
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the index which is being rebuilt is stored in a temporary area and brought in when the rebuild has finished to replace the existing index. An outage shouldnt really have any affect. The database consistency overall could be supsect but sql server takes care of this when starting up the database (using the transaction log file).
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"Ya can't make an omelette without breaking just a few eggs"
Post #885961
GTR
GTR
Posted Thursday, March 18, 2010 4:12 PM
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Perry is correct, ACID property holds good here.
EnjoY!
Post #885964
GilaMonster
GilaMonster
Posted Friday, March 19, 2010 3:36 AM
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As with any data modification, if the transaction is not committed and there's a server failure, the changes will all be rolled back as part of the database restart-recovery.
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 #886175
hydbadrose
hydbadrose
Posted Friday, March 19, 2010 9:33 AM
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Thank you so much all for the reply! So it rolls back even for the job fails for some reason?
Post #886487
Perry Whittle
Perry Whittle
Posted Friday, March 19, 2010 6:27 PM
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As Gail says "no commit, no dice"
it's also worth noting if the database is in simple or bulk-logged recovery the create\alter index is not fully logged!
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"Ya can't make an omelette without breaking just a few eggs"
Post #886805
GilaMonster
GilaMonster
Posted Saturday, March 20, 2010 3:57 AM
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Perry Whittle (3/19/2010)
it's also worth noting if the database is in simple or bulk-logged recovery the create\alter index is not fully logged!
Minimally logged, but that doesn't change the 'no commit, no change' rule.
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 #886870
Perry Whittle
Perry Whittle
Posted Saturday, March 20, 2010 4:16 AM
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yes, that goes without saying!
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"Ya can't make an omelette without breaking just a few eggs"
Post #886873
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