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HELP= Rebuild index & Update STATISTICS


HELP= Rebuild index & Update STATISTICS

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hydbadrose
hydbadrose
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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
Perry Whittle
Perry Whittle
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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" ;-)
GTR
GTR
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Perry is correct, ACID property holds good here.

EnjoY!
GilaMonster
GilaMonster
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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, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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hydbadrose
hydbadrose
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Thank you so much all for the reply! So it rolls back even for the job fails for some reason?
Perry Whittle
Perry Whittle
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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" ;-)
GilaMonster
GilaMonster
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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, MVP, M.Sc (Comp Sci)
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


Perry Whittle
Perry Whittle
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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" ;-)
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