High Waits for "SGA: allocation forcing component growth" and Slow Database Performance in 10g (Doc ID 1170814.1)

Last updated on APRIL 23, 2016

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.1 to 10.2.0.5 [Release 10.2]
Oracle Database - Enterprise Edition - Version 10.1.0.4 to 10.1.0.4 [Release 10.1]
Information in this document applies to any platform.
Checked for Relevance 16-MAY-13

Symptoms

Slow database performance in peak hours.

The AWR shows the following in Top 5 waits table.

Event                                    Waits Time(s) Avg Wait(ms) % Total Call Time Wait Class
CPU time                                           113                           85.4
db file sequential read                  6,831       7            1               5.4 User I/O 
SGA: allocation forcing component growth   196       3           16               2.3 Other
db file scattered read                   2,723       2            1               1.5 User I/O
kksfbc child completion                     17       1           56                .7 Other 

The top waits sections show "SGA: allocation forcing component growth" during peak time which is not there in normal load.

Cause

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