Partitionining perfortmance degraded drastically after upgrading the database from Oracle 102.0.4 to Oracle 11.2.0.3
- From: "Mandal, Ashoke" <ashoke.k.mandal@xxxxxxxxxxxxx>
- To: "oracle-l-bounce@xxxxxxxxxxxxx" <oracle-l-bounce@xxxxxxxxxxxxx>, "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 9 Jan 2015 13:58:10 +0000
Greetings All,
I have upgraded one of my 2TB databases with partitioned tables & indexes from
Oracle 10.2.0.4 to Oracle 11.2.0.3 recently and experiencing severe poor query
performance. The response time of the queries have increased by 20-25 times.
Before the upgrade to 11g
PGA_AGGREGATE_TARGET=6GB
SGA_TARGET=4GB
SGA_MAX_SIZE=6GB
After the upgrade to 11g
MEMORY_TARGET=6GB
PGA_AGGREGATE_TARGET=0
SGA_TARGET=0
SGA_MAX_SIZE=1GB
My understanding is that if I set SGA_TARGET and PGA_AGGREGATE_TARGET
parameters to 0 then Oracle manages theses as per the MEMORY_TARGET parameter
in 11g.
Q. Is it true that the SGA can't grow more than 1GB since SGA_MAX_SIZE is still
set to 1GB?
Q2. Will the performance improve by setting SGA_TARGET to 4GB by default?
Q3. Should I also set the PGA_AGGREGATE_TARGET to GB as it was prior the
upgrade?
Q4. Any known issue of partitioning performance impact after you upgrade a 10g
database to 11g?
Please let me know if you any suggestions to resolve this issue
Appreciate your help in advance,
Ashoke
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