SQL, LUNs and SQL maintenance (index rebuilds & re-organization)

[marcconeley]

Hi Guys,

I am looking for some guidance here.

I have a number of SQL 2005/8 servers with iSCSI LUNs on our NetApp filer, and I am using SnapManagerSQL for backup.

Are there any implications to running routine maintenance tasks on the databases? I am talking about the defualt ones available via the "Maintenance Task Wizard" in SQL manager - so no database defrags or anything like that. Specifically I am talking about:

- database integrity checks.

- re-organize index tasks

- re-build index tasks

- update statistics tasks

I have been asked to scedule these SQL jobs on some of our larger databases - but I am concerned about high amounts of block changes which could result in larger snapshots or performance issues.

I can't find anything regarding this in the SMSQL guides - just the normal "don't perform defrags" etc.

Help appreciated!

Marc 😉

[nimalraj6]

I am also after the same information and would appreciate any input from the NetApp Gurus here.

Thanks,

Nimal

[abhisek]

Hi Marc ,

Please take full backup from SMSQL before and after performing the database maintenance tasks. If the iSCSI LUN layout for the database had been done properly then I do not see any performance impact from a I/O standpoint.

In SMSQL we have the option to run DBCC checkdb to preserve the db consistency.

You may also want to do some sizing to find more about this.

Regards,

Abhishek

[marcconeley]

Hi Abhishek,

So performing rebuilds or re-organisation of SQL indexes doesn't cause large amounts of I/O or block level changes like a typical defrag does?

(and yes, my iSCSI LUN layout is correct).

Thanks,

Marc