Re: Logical standby issues

  • From: Mark Bole <makbo@xxxxxxxxxxx>
  • Date: Mon, 31 Oct 2005 15:53:36 -0800

Laimutis Nedzinskas wrote: 


Need some help or opinions regarding Oracle logical standby database.

Environment:

Logical standby, version 10, release 1, patch 4.
Primary and standby are tight coupled (maximum availability mode).
[...]

1) Deletion of consumed archive logs both on the standby and the primary site:[...]

2) Time from time standby breaks but this is more due to the schema patches.[...]

3) DB Guard leakes PGA memory on the primary. It leaked it for a fact(by OS reports), it was not V$-view bug. Had to disable it. Not really happy about that.

[item 4 missing in original] 

5) Primary is not happy about unexpected standby restarts.[...]

6) To sum up: something's a bit shaky in my environment at least. Should I give up with maximum availability mode and reduce the database to maximum performance mode? I am interested to hear from others.

Are you using the logical standby as a front-line disaster recovery database? My recommendation is to use physical standby instead, as there are too many ways that a logical standby can deviate from the primary, both intentionally and otherwise. These potential deviations are not a good thing when you are trying to resume operations exactly where the primary left off.

Could you explain your item (3) a little more? Which process or setting did you disable?

I was hoping to see a more helpful reply than this one, but haven't yet.

--
Mark Bole
http://www.bincomputing.com



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