RE: HIT RATIO

From: Fink, Dan <Dan.Fink_at_mdx.com>
Date: Tue, 19 Nov 2002 11:29:07 -0800
Message-ID: <F001.00507082.20021119112907@fatcity.com>

Set up a dbms_job to run the command "select 'x' from dual;" every 10 seconds or so. I think you'll find that your hit ratio increases quite nicely.

Oh, the only potential downside is that your overall system performance might go down, way down! But your ratios are great!

It is kind of like taking your car into the mechanic and complaining it only goes 20 miles per hour. He runs some tests and says, "Everything is fine, there are not any performance problems because your gas mileage is 30 miles per gallon." The two are not related.

Seriously, don't focus on the ratio. Check out the great papers on www.hotsos.com, www.orapub.com and www.evdbt.com. And buy a copy of Oracle Performance Tuning 101 from Oracle Press. Focus on wait events, overall performance times and reducing i/o.

Dan Fink

-----Original Message-----

Sent: Tuesday, November 19, 2002 12:05 PM To: Multiple recipients of list ORACLE-L

Hi
One of my database showing hit ratio low (=75% approx).I increased the parameters.After last reboot hit ratio was looking great.Last reboot was last week.I am wondering again this ratio is 73% approx. How to fix this problem except Init.ora prameter change? Thx
-Seema

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Author: Seema Singh
  INET: oracledbam_at_hotmail.com

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Author: Fink, Dan
  INET: Dan.Fink_at_mdx.com

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