To attempt to mitigate ORA-04030 crashes we've been experiencing, Oracle
has suggested lowering sga_target. Unfortunately, the log/trace files
have provided no clues at all as to what is causing this crash every 3-5
weeks. The server has 4GB of physical RAM, but is not using the /3GB
switch so Oracle can only access 2GB. Currently sga_target is set at
1.2GB. The server runs only this 1 instance of Oracle so Windows has
plenty of mem.

select * from v$sga_dynamic_free_memory gives 0 because
sga_target=sga_max_size so Oracle has no memory to grow if needed. It
shouldn't need to since 1.2GB should be way more mem than it needs for SGA.

Based on note 295626.1 I don't think I can reduce sga_target appreciably
without getting ORA-00827 (could not shrink sga_target to specified
value). Currently the sum of the min sizes

(select component, current_size/1024/1024 "CURRENT_SIZE",
 min_size/1024/1024 "MIN_SIZE",
 user_specified_size/1024/1024 "USER_SPECIFIED_SIZE"
from v$sga_dynamic_components)

is 1188 and sga_target is 1200.

Is there any way I can reduce sga_target to 1000 dynamically? Will I
just have to keep doing it in small steps of 12 for example?

--

Sincerely,
Michael Ray
Topshot Systems LLC
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