Problem with large SGA

Oracle v8.1.7.4
OpenVMS 7.3-2

We recently increased the size of our SGA from 40gig to over 100gig by increasing our shared pool and block buffer cache. Everything has gone very well.

One side effect we have encountered is that the time it takes to put all our tablespace into HOT backup
(ALTER TABLESPACE xxxxx BEGIN BACKUP;)
has gone from 1 hour to about 3.5 hours. In retrospect, this makes some sense as the buffer cache is examined for blocks from the specific
tablespace to be written to disk; more cache to examine so it takes more time.

Oracle has confirmed this. We have received the "expected behavior" answer regarding this issue.

Anybody have any ideas on how to minimize the impact of this?

Dan Hubler
Database Administrator
Aurora Healthcare
daniel.hubler_at_aurora.org

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