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Don Burleson Blog 







SGA: allocation forcing component growth Tips

Oracle Database Tips by Donald BurlesonNovember 16, 2015

Question:  see the following waits in my AWR for our prod instance:

Event Waits Time(s) Avg wait (ms) % DB time Wait Class

SGA: allocation forcing component growth 85,883 5,062 59 32.57 Other
cursor: pin S wait on X                   4,091 3,913 957 25.18 Concurrency
library cache load lock                     694 2,256 3251 14.52 Concurrency
library cache: mutex X                      883 1,626 1842 10.46 Concurrency
DB CPU                                      917 5.90

How do I resolve this SGA: allocation forcing component growth wait?

Answer: The SGA: allocation forcing component growth indicates that you can Automatic Memory Management (AMM) turned-on

This is an AMM message indicating that the size of sga_target or memory_target is too small, causing excessive AMM resize operations.

The solution is to turn off AMM and allocate your own db_cache_size and shared_pool_size and un-setting sga_target and memory_target.


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