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Status Not under consideration
Workspace Db2
Created by Guest
Created on Sep 10, 2020

RELATED IDEAS

Allow start RESTORE on non-catalog db-partitions earlier

In a Multi-Partitioned databases, we currently need to restore each database partition individually, but, not all of them can be made in parallel.

Catalog Partition must be restored first. and it must complete before we can start restoring the remaining db-partitions.

This increases the RECOVERY time drastically. Normally, RESTORE operations takes longer to complete than the backup time. (1.5x to 2x times higher) ,
In a DPF system, this is even worst. If we are running in DPF, that's because the database is already HUGE, so the backup can take 5h , 10h to complete.

We have a DPF system at AMEX (26 db partitions) , that takes around 20h to restore.
8h to restore only the catalog db-partition + 12h to restore all other 25 db-partitions in parallel.

This is too much downtime.

This idea propose to allow starting restoring the other db-partitions before the catalog-partition restore gets completed.

The SYSCAT tablespace which I assume is the most important one, is normally small size, and gets restored pretty fast. So, Db2 should have all the necessary information to allow the remaining db-partitions restores to get started, while the other user-data tablespaces are still in progress in the catalog one.

Needed by Date Dec 31, 2020

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