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Oracle cursor_sharing=force

Oracle Tips by Burleson Consulting


An Oracle9i database had experienced poor performance immediately after a new manufacturing plant was added to the existing database. Since the AWR was not available in version 9i, a standard STATSPACK  report was used to isolate the top five wait events which looked similar to this:

Top 5 Wait Events
~~~~~~~~~~~~~~~~~                                   Wait     % Total
Event                                     Waits  Time (cs)   Wt Time
---------------------------------- ------------ ------------ -------
enqueue                                  25,901      479,654   46.71
db file scattered read               10,579,442      197,205   29.20
db file sequential read                   724,325      196,583    9.14
latch free                            1,150,979       51,084    4.97
log file parallel write                 148,932       39,822    3.88

A review of the SQL section of the STATSPACK report revealed that almost all of the SQL used literals in the WHERE clause of all queries.

     WHERE customer_state = ‘Alabama’ and customer_type = ‘LAWYER’;

The cursor_sharing parameter was the only fast solution because the application was a vendor package with dynamically generated SQL and it could not easily be changed without using Optimizer Plan Stability (Stored Outlines), a very time-consuming task. 

Setting cursor_sharing  =force greatly reduced the contention on the library cache and reduced CPU consumption.  The end users reported a 75 percent improvement in overall performance.


This is an excerpt from my latest book "Oracle Tuning: The Definitive Reference". 

You can buy it direct from the publisher for 50%-off and get instant access to the code depot of Oracle tuning scripts:



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