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Don Burleson Blog 







Oracle Performance Checklist

Oracle Tips by Burleson Consulting
Don Burleson


As a consultant, I follow a standard procedure when I come into a new shop with a database that I have never seen before.  My goal is to quickly identify and correct performance problems.  Here is a summary of the things that I look at first:
1 - Install STATSPACK first, and get hourly snaps working.
2 - Get an SQL access report (or plan.sql), an spreport during peak times, and statspack_alert.sql output.
3 -  Look for silver bullet fixes: 
  • partial schema statistics (using dbms_stats)
  • missing indexes
  • optimizer_index_cost_adj=(between 20-60 for OLTP systems)
  • optimizer_index_caching=xx (depending on RAM for index caching)
  • optimizer_mode=first_rows (for OLTP)
  • hash_area_size too small (too many nested loop joins)
4 - Fully utilize server RAM - On a dedicated Oracle server, use all extra RAM for db_block_buffers (db_cache_size) less PGA's and 20% RAM reserve for OS.
5 - Get the bottlenecks - See STATSPACK top 5 wait events - OEM performance pack reports - TOAD reports
6 - Look for Buffer Busy Waits resulting from table/index freelist shortages
7 - See if large-table full-table scans can be removed with well-placed indexes
8 - If tables are low volatility, seek an MV that can pre-join/pre-aggregate common queries.  Turn-on automatic query rewrite
9 - Look for non-reentrant SQL - (literals values inside SQL from v$sql) - If so, set cursor_sharing=force

10 - Monitor over time - The ongoing STATSPACK reports should show any new performance problems.

If you do Oracle tuning, you will need Mike Ault collection of 400+ scripts.  Mike has priced his collection of 465 scripts at $39.95, less than a dime per script.  You can download them immediately at this link:


   Don Burleson



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