Question

How to repair offline and suspect db in sybase

Asked by: motioneye

Hi,
So far I never encountered any as above, but I would like to know if sybase db get to suspect mode or corrupted what will be a step to repair it?

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Asked On
2009-10-15 at 08:53:04ID24815296
Topic

Sybase Database

Participating Experts
3
Points
500
Comments
3

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Answers

 

by: awa2008Posted on 2009-10-15 at 18:43:15ID: 25586427

 

by: Joe_WoodhousePosted on 2009-10-16 at 08:32:54ID: 25590486

The Troubleshooting Guide really is your best guide here.

There is usually not very much you can do to repair databases. Only some of the dbcc commands have "fix" options, and they're all very slow to run. For any database of reasonable size my best advice is to not even attempt a repair and just restore from backup.

Of course, if the backup is also corrupted you're in trouble. Likewise if you don't have the ability to replay transactions since the last full backup was taken. Thus an appropriate Sybase DR plan considers both of these problems and tries to mitigate them in advance. Basically you can't assume you will be able to repair a corrupted database at all.

Sometimes you're able to do tricks like get the data out of a corrupt table if the corruption is on an index - you can select into a new table, forcing a table scan.

 

by: BenSladePosted on 2009-10-19 at 14:45:33ID: 25609326

Also, if you use warm standby replication, page level corruptions typically won't replicate to the warm standby copy of the database.    Unfortunately, clusters (multiple computers using sharing disks) don't provide any protection against db corruption.

In addition to Sybase page level corruption, you also have to worry about application level data corruption.   Ie., somebody changes some client code and starts writing bad values to the database, but it doesn't get noticed for a few months.   The only way to protect against this is to institute intelligent db dump archiving policies.  Eg., Save daily dumps for a few months, save monthly full dumps for several years.

The only major db corruption I've seen in the past few years has been because of Hitachi disk drives (HUA72101 disks, aka Ultrastar A7K1000) using their own internal write cache (by default), which caused lost writes during a power loss (even though the drive told the operating system that the write had completed!)

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