> Each morning I produce graphs... I think this is key. Having historical data graphically presented helps to establish the norm and when there may be performance issues to investigate. This follows step 2 of Gaja's "Oracle Performance Tuning 101 Methodology" which says, "Measure and document current performance."
To do this I created a DBA monitoring HTML display tool which gets data from V$SYSSTAT and V$SYSTEM_EVENT once a minute, stores it in a round robin database and displays it with RRDTool. I've accumulated 2 months of this data and it's amazing how lightweight it is. With graphs it's easy to see when something's amiss. We capture expensive SQL via StatsPack every 15 minutes and I have correlated a spike on a graph to specific SQL executed 2 hours earlier. Now I'm trying to decide on my next enhancement: 1) HTML/GUI interface to StatsPack data or; 2) Drill down to V$SESSION_WAIT ??? Steve Orr Bozeman, Montana -----Original Message----- Sent: Thursday, May 09, 2002 5:23 PM To: Multiple recipients of list ORACLE-L Importance: High In general There are two problems in using the "top five waits" out of statspack: it reports idle waits; no matter how well-tuned your database there will always be a top five. The numbers presented show total time-waited in csecs for the time period. As Jared said we don't know the time period. We don't know the average wait time. I have learned some rudimentary gnuplot skills. Each morning I produce graphs of what went on the in the databases the previous day on and hour by hour basis. If something is really askew I break the hour down into ten minute blocks. This helps me to better recognize patterns of database usage. Ian MacGregor Stanford Linear Accelerator Center [EMAIL PROTECTED] -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Orr, Steve INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
