SQL very slow Performance after upgrade.

We have recently upgraded to 10.2.0.5 for 11.2.0.1, and the performance of some of our queries SQL slowed considerably. For example, a query that works almost instantly in 10 g takes more than 30 seconds to 11 g. When I run an autotrace, the LAST_CR_BUFFER_GETS in 10g is 1067 and 11 g, it's 621006!

I don't know why the exact same query would produce different results. I'm sure it's a matter of adjustment, but any ideas on where to start would be appreciated.

This command will gather his stats, but the default values can be different between 10g and 11g. You should check out what they are. Here are the ones I have change:

select dbms_stats.GET_PREFS('AUTOSTATS_TARGET') from dual;
select dbms_stats.GET_PREFS('CASCADE') from dual;
select dbms_stats.GET_PREFS('ESTIMATE_PERCENT') from dual;
select dbms_stats.GET_PREFS('METHOD_OPT') from dual;
select dbms_stats.GET_PREFS('NO_INVALIDATE') from dual;
select dbms_stats.GET_PREFS('GRANULARITY') from dual;
select dbms_stats.GET_PREFS('PUBLISH') from dual;
select dbms_stats.GET_PREFS('INCREMENTAL') from dual;
select dbms_stats.GET_PREFS('DEGREE') from dual;

And then I change them to:

EXEC DBMS_STATS.SET_GLOBAL_PREFS('AUTOSTATS_TARGET','ORACLE');
EXEC DBMS_STATS.SET_GLOBAL_PREFS('CASCADE','TRUE');
EXEC DBMS_STATS.SET_GLOBAL_PREFS('ESTIMATE_PERCENT','100');
EXEC DBMS_STATS.SET_GLOBAL_PREFS('METHOD_OPT','FOR ALL COLUMNS SIZE 1');
EXEC DBMS_STATS.SET_GLOBAL_PREFS('NO_INVALIDATE','FALSE');
EXEC DBMS_STATS.SET_GLOBAL_PREFS('GRANULARITY','ALL');
EXEC DBMS_STATS.SET_GLOBAL_PREFS('PUBLISH','TRUE');
EXEC DBMS_STATS.SET_GLOBAL_PREFS('INCREMENTAL','TRUE');

Your preferences may be different, but we do not use histograms and we always 100% of the data samples. Find out what the other parameters in the Oracle documentation.

Good reading on this topic [url http://www.ora00600.com/scripts/statistics/restore_schema_stats.html] restore schema stats and this one on [url http://www.ora00600.com/scripts/statistics/gather_system_stats.html] collect statistics of the system.

When you gather stats, you may need to clear the shared pool afterwards so that they SQL request are difficult, analyzed again and use the stats again. Use the ALTER SYSTEM FLUSH SHARED_POOL but probably better to do so in a period of low activity.

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    control file parallel write         2,981          0         12      4      0.5
    db file scattered read              3,464          0          5      1      0.6
    db file sequential read             1,756          0          2      1      0.3
    rdbms ipc reply                       137          0          2     16      0.0
    log file single write                 160          0          0      2      0.0
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    db file parallel write              3,904          0          0      0      0.7
    direct path read                    1,833          0          0      0      0.3
    direct path write                   1,833          0          0      0      0.3
    log file sequential read              160          0          0      0      0.0
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              -------------------------------------------------------------
    ^LSQL ordered by Gets for DB: OAPROD  Instance: OAPROD  Snaps: 551 -553
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    --------------- ------------ -------------- ------ -------- --------- ----------
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