Differential Backup

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Differential Backup

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crazy4sql

Posted Monday, February 08, 2010 1:50 AM

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Hi Guys,
Just a quick question, is it advisable to have differential backup in production environment and what should be its frequency if you taking full backup daily midnight and log backup after every 15 min?

Regards
Ashish

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Ashish

Post #861474

Dinesh Asanka

Posted Monday, February 08, 2010 2:02 AM

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in your senario, you don't need diff backups. But there are places which has only one full backup for a week. take diff. backup daily mid night. log backups during day time

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Post #861484

free_mascot

Posted Monday, February 08, 2010 2:34 AM

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Again it depends on how critical the data is and you need to justify taking differential backup.

In your environment taking differential backup will only help when you need to recover the data on production. It will help you to reduce the down time by reducing the restore of T-log backups.

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Post #861503

maechismo_8514

Posted Monday, February 08, 2010 3:37 AM

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Dinesh Asanka (2/8/2010)

in your senario, you don't need diff backups.

That's a wrong piece of advise.

But there are places which has only one full backup for a week. take diff. backup daily mid night. log backups during day time

Totally depends on his business requirements and the recovery period that they have set to. Differential backups are an added advantage on database recovery at a DR scenario and also it does not lead to confusion. It is better and recommended to have atleast one differential backup during the mid-day.

Post #861528

crazy4sql

Posted Monday, February 08, 2010 3:42 AM

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Thanks for so quick response.
But my only point is running differential backup for big database and highly transactional database, will impact the performance....

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Ashish

Post #861530

Tush

Posted Monday, February 08, 2010 6:16 AM

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Adding additional differential backup on your existing backup policy may impact your performance(schedule it at non-peak hours).. and not to mention,you will have to preserve it to achieve the recovery..

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Post #861593

GilaMonster

Posted Monday, February 08, 2010 6:36 AM

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Krishna Potlakayala (2/8/2010)

It is better and recommended to have atleast one differential backup during the mid-day.

Why?

Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Post #861608

maechismo_8514

Posted Monday, February 08, 2010 8:26 AM

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GilaMonster (2/8/2010)

Krishna Potlakayala (2/8/2010)

It is better and recommended to have atleast one differential backup during the mid-day.

Why?

Woudn't be a better option to restore Full backup then differential which was taken during the mid day and then all subsequent transaction log backups, instead of going through those bunch of Tlogs for every 15 mins. :)

Post #861722

GilaMonster

Posted Monday, February 08, 2010 8:35 AM

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Maybe, maybe not.

Depends how big the DB is, how long it takes to backup full, diff or log, how long the restores take, what the downtime allowance of the DB is, how much storage space is available, how long backups are retained, how much of a performance impact the diff backup has, etc.
There's no absolute right or wrong answer.

Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Post #861736

maechismo_8514

Posted Monday, February 08, 2010 8:45 AM

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True Gail, completely agree on that. I dint want to complicate him and advised as a possible solution that he'd better has a differential backup during the mid day which may reduce some labor intensive work.

Post #861747

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