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SQL profiling catching-on

 
The use of vendor-based tools for tuning sets of SQL statements is catching-on in both Oracle and now, SQL Server:
 
In SQL Server 2000, the SQL Profiler can help you diagnose and fix SQL Server performance issues. This tool lets you trace events and play back the results, which can help you determine application and/or query problems, such as long-running queries or ineffective indexes.
Copying Oracle approach (and the name SQL profile) to empirical SQL tuning (tuning by testing execution speeds in he real-world).  Oracle's approach to SQL tuning with SQL profiles appears to be far more robust and sophisticated than the SQL Server offering.
 
Below we also see that the proactive, time-series approach to tuning (especially SQL tuning) is the wave of the future:
 
The main new features of SQL tuning in Oracle10g include the following:
  • Oracle10g now automatically collects and refreshes schema statistics using the dbms_stats package, and histogram collection is now easily automated with dbms_stats
  • One common cause of sub-optimal SQL is missing materialized view and indexes, especially function-based indexes. The SQLTuning Advisor and SQLAccess Advisor provide an easy method for identifying and tuning SQL with sub-optimal execution plans.
  • SQL Profiles are a great improvement of Optimizer Plan Stability (stored outlines).
  • The new dba_hist tables contain a wealth of historical information about historical SQL execution statistics.
  • Time-series analysis of object usage within SQL can give us important insights into holistic tuning for SQL statements.
     

 

 
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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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