Avoid increasing SGA

Question

Hi,
My database suffers recently a lack of SGA memory (I have suffered some ora error related with it). As you can see in my statspack report:
Instance Efficiency Percentages (Target 100%)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Buffer Nowait %: 100.00 Redo NoWait %: 100.00
Buffer Hit %: 95.68 In-memory Sort %: 100.00
Library Hit %: 99.41 Soft Parse %: 98.72
Execute to Parse %: 52.22 Latch Hit %: 99.99
Parse CPU to Parse Elapsd %: 93.46 % Non-Parse CPU: 99.95
Shared Pool Statistics Begin End
Memory Usage %: 93.27 75.92
% SQL with executions>1: 22.06 21.30
% Memory for SQL w/exec>1: 31.68 31.12
Initially (we have increased them) the memory usage is high, but the % of SQL with executions > 1 is very low. This probably means that a lot of SQL can't be reused due to bad work of SQL programmers (basically not use of bind variables). There is some method to detect which kind of sentences should be rewritten in order to order programmers to re-write it?
There is some method to avoid this issued and avoid to be largering the shared_pool_size ad infinitum?
Thanks

Answer 1

1) check top 5/10 sql and try to tune / rewrite them .
2) try cursor_sharing = similar/force parameter ,and see is there any improvement.
Cheer,
Virag Sharma
http://virag.sharma.googlepages.com/
http://viragsharma.blogspot.com/