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Status Future consideration
Workspace Informix
Components Informix Server
Created by Guest
Created on Sep 29, 2014

Improve performance of L1/L2 backups

Current, for L1 (or L2) backups we need to read all pages. This is highly inefficient and there are alternatives for implementing this.
In the PMR we've been told this matches old FEA idsdb00010525. In this the proposed solution was to maintain a timestamp in the partition header. This could be used to avoid partitions not changed since the last backup. The downside of this solution would be that for big partitions with just a few changed pages we would still include them on the list.

Another possibility would be to implement something like Oracle's Block Change Tracking which is described in detail here:

http://www.pythian.com/documents/Pythian-oracle-block-change.pdf

and in the Oracle product documentation.
This would be the best approach from an efficiency perspective, and we could do it in the bitmap pages (which would need to be extended).
The downside of this would be that the physical page layout (for the bitmaps would need to be changed).

Either soultion would be MUCH better than what we have now. First one would work for static historic data... and seems simpler to implement (an INSERT and DELETE already need to change the partition header... not sure about an UPDATE or other activities)

Customer complains that there isn't much advantage in using L1 as they're very slow.