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about system databases.


about system databases.

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naidu6
naidu6
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when system databases like model and msdb are in suspect mode,will sql server will be up and running or live?

thanks in advance.
GilaMonster
GilaMonster
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If SQL cannot open and recover master and model successfully, SQL's startup process will fail. If MSDB can't be opened and recovered, SQL Agent will not be able to run.

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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naidu6
naidu6
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Gail, what i mean is,when sql server is running fine,then suddenly model and msdb went into suspect mode during this time will sql server work fine or not?

here :

when msdb is in suspect mode what will happen?
when model goes to suspect mode what will happen?
GilaMonster
GilaMonster
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Well they can't just 'go suspect'

Suspect mode requires that SQL encounters corruption during a transaction rollback or during crash recovery. Typically, because the system databases (other than MSDB) aren't changed much, there aren't many rollbacks and corruption would much more likely be encountered during crash recovery on startup.

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


naidu6
naidu6
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what if system databases go suspect mode due to corruption during transaction rollback or during crash recovery.that time will the sql server will be alive?



Suspect mode requires that SQL encounters corruption during a transaction rollback or during crash recovery. Typically, because the system databases (other than MSDB) aren't changed much, there aren't many rollbacks and corruption would much more likely be encountered during crash recovery on startup.
GilaMonster
GilaMonster
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As I said earlier...

GilaMonster (7/15/2013)
If SQL cannot open and recover master and model successfully, SQL's startup process will fail. If MSDB can't be opened and recovered, SQL Agent will not be able to run.


Open and recover = open database, run crash 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

We walk in the dark places no others will enter
We stand on the bridge and no one may pass


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