October 24 2011

Informix: Shall we plan to backup logical logs on the RSS instances?

Tagged Under : , , ,

Question:
We want to initialize high-availability replication (HDR) and/or Remote Standalone Secondary (RSS) replication. Should we plan to backup logical logs on the secondary server instance(s)?

Reference URL:
http://www-01.ibm.com/support/docview.wss?uid=swg21516867&myns=swgimgmt&mynp=OCSSGU8G&mync=E

Applies to:
IDS 11.1, 11.50, 11.70

Answer:
The secondary server instances are in a continuous log apply status. You cannot execute a logical log backup on an HDR or RS secondary server.
This applies regardless of whether it is a read-only or updatable secondary.

The ontape and onbar logical log backup commands plus the message returned:

ontape

$ ontape -l
Logical restore failed – A Logical Restore is already in progress.

Program over.
onbar

$ onbar -b -l
DR: This command is not valid on a secondary server.