Message-Id: <10708.124351@fatcity.com> From: "Koivu, Lisa" Date: Tue, 12 Dec 2000 13:07:20 -0500 Subject: RE: Your opinion please...RBS This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------_=_NextPart_001_01C06466.5EA29DF2 Content-Type: text/plain; charset="iso-8859-1" Yes, the rule of thumb is if you have any waits, you have too few rbs's. But more than 26? That's more than I've seen in my tenure as a dba, and I've worked on databases and applications larger (and busier) than this. My gut feel is that it's harmless to add some more rbs's and increase sizes. Aw, what the heck. I already had my death scare for the day and my heart just stopped pounding about 10 minutes ago. Lisa Rutland Koivu Oracle Database Administrator Qode.com 4850 North State Road 7 Suite G104 Fort Lauderdale, FL 33319 V: 954.484.3191, x174 F: 954.484.2933 C: 954.658.5849 http://www.qode.com "The information contained herein does not express the opinion or position of Qode.com and cannot be attributed to or made binding upon Qode.com." -----Original Message----- From: Emine ATES [mailto:emineates@postmaster.co.uk] Sent: Tuesday, December 12, 2000 11:44 AM To: Multiple recipients of list ORACLE-L Subject: Re: Your opinion please...RBS Dear Lisa I think your problem is having too few rollback segments . As you know Oracle shares transactions between rolback segments acc to their active transaction count.In your case you have only one rollback segment so all transactions must share it. You can make it bigger and bigger, but you should also think about transaction table of it, there may be congestion on the transaction table of rbs. Therefore you should create more rbs Oracle says that rbs count should be transaction count / 4 but I think because you know your system requirements you can calculate as you wish. Good luck -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Emine ATES INET: emineates@postmaster.co.uk 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: ListGuru@fatcity.com (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). ------_=_NextPart_001_01C06466.5EA29DF2 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable RE: Your opinion please...RBS

Yes, the rule of thumb is if you have any waits, you = have too few rbs's.  But more than 26?  That's more than I've = seen in my tenure as a dba, and I've worked on databases and = applications larger (and busier) than this. 

My gut feel is that it's harmless to add some more = rbs's and increase sizes. Aw, what the heck.  I already had my = death scare for the day and my heart just stopped pounding about 10 = minutes ago.  <whew>


Lisa Rutland Koivu
Oracle Database Administrator
Qode.com
4850 North State Road 7
Suite G104
Fort Lauderdale, FL  33319

V: 954.484.3191, x174
F: 954.484.2933
C: 954.658.5849
http://www.qode.com

"The information contained herein does not = express the opinion or position of Qode.com and cannot be attributed to = or made binding upon Qode.com."


-----Original Message-----
From: Emine ATES [mailto:emineates@postmaster.c= o.uk]
Sent: Tuesday, December 12, 2000 11:44 AM
To: Multiple recipients of list ORACLE-L
Subject: Re: Your opinion please...RBS


Dear Lisa
I think your problem is having too few rollback = segments .
As you know Oracle shares transactions between = rolback segments acc to their active transaction count.In your case =
you have only one rollback segment so all = transactions must share it. You can make it bigger and bigger, but you = should
also think about transaction table of it, there may = be congestion on the transaction table of rbs.
Therefore you should create more rbs Oracle says = that rbs count should be transaction count / 4 but I think because you = know your system requirements you can calculate as you wish.

Good luck
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Emine ATES
  INET: emineates@postmaster.co.uk

Fat City Network Services    -- (858) = 538-5051  FAX: (858) 538-5051
San Diego, = California        -- Public Internet = access / Mailing Lists
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To REMOVE yourself from this mailing list, send an = E-Mail message
to: ListGuru@fatcity.com (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 =