Classic!
--- "Fink, Dan" <[EMAIL PROTECTED]> wrote: > Here's an excellent real life example of why BCHR is not a good > tuning > metric and you should focus on reducing I/Os. > A simple fix for a query and here is the resulting email to the > client, who > understands that BCHR is not good. A little techie humor... > > I have good news and I have bad news. > > The good news is that the elapsed query time and total I/Os for the > latest > iteration dropped significantly. > > Old --> 1:42 min 2,715,659 i/os (15,925 physical) > > New --> 22 seconds 3318 i/os (2861) > > However, the bad news is that the Buffer Cache Hit Ratio dropped > dramatically! > > Old --> 99.36% > > New --> 13.77% > > So, I have undone all the changes I made and will begin looking at > other > methods to improve performance! > > __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Rachel Carmichael INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- 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).
