100% CPU Used When Memory Advisor tab in Enterprise Manager is Selected (Doc ID 1321123.1)

Last updated on SEPTEMBER 15, 2016

Applies to:

Oracle Server - Enterprise Edition - Version: 10.1.0.2 to 11.2.0.2.0 - Release: 10.1 to 11.2
Information in this document applies to any platform.

Symptoms

When the Memory Advisor Tab in Enterprise Manager is selected, the operation seems to hang and it may take 100% CPU.

The query executed when the Memory Advisor Tab is selected is:-
SELECT   component ,
final_size,
end_time
FROM v$sga_resize_ops
WHERE initial_size <> final_size
ORDER BY end_time;


When the same query is run from SQLPLUS it takes lot of time to execute and the process will take 100% CPU.

Changes

OPTIMIZER_MODE=FIRST_ROWS

From 10g, the default value for OPTIMIZER_MODE parameter is ALL_ROWS

Cause

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