Glenn, The buffer cache hit ratio is meaning less, not only after startup but any time you calculate it. I am pretty sure that I am not the first one and probably not the last one saying that on this mailing list.
Now about the claim of why you need to wait until 10i to get this fixed, has probably something to do with the fact of how the SGA is allocated on the HP platform. Any change in the layout of the fixed SGA will mean a recompile of the code on HP. Now it looks to me that the upper 4 bytes of the 8 bytes have been set to -1: 18446744069434437169 FFFFFFFF012EEE31 18446744052688746229 FFFFFFFB1B0FF6F5 So you probably could adjust for that .... Anjo. Glenn Travis wrote: > I sent a message last week regarding our values in the v$sysstat table being WAY too >large; > physical_reads = 18,446,744,069,434,437,169 > db_block_gets, physical_reads_direct, physical_writes_direct also. > > This prevents us from running the db cache hit ratio queries. > > I logged a tar with Oracle and they said it was a bug (#1713403). It is caused by >an overflow in v$sysstat when the amount of generated redo grows over 2GB. They say >this bug can't be fixed (at least not until 10i!). I am running on 8.1.7 (HP-UX11). > > If you are on 8i, could you query the v$sysstat table and let me know if anyone else >is seeing this problem? > > col name for a20 > col value for 999,999,999,999,999,999,999 > select name,value from v$sysstat > where name in ('redo size', 'physical reads', 'db block gets') > / > NAME VALUE > -------------------- ---------------------------- > db block gets 18,446,743,996,920,309,855 > physical reads 18,446,744,052,688,746,229 > redo size 17,049,609,736 > > I find it unacceptable that Oracle would ignore this until 10i. The only time I can >get a cache hit ratio is when I first start up the database (which doesn't mean >anything). I know hit ratios are overrated and we look at waits more for performance >tuning (read all the articles), but it is still frustrating nonetheless. > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.com > -- > Author: Glenn Travis > 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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Anjo Kolk 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).