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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Your opinion please...RBS
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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
"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_at_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_at_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_at_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-printableReceived on Tue Dec 12 2000 - 12:07:20 CST
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<P><FONT SIZE=3D2>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. </FONT></P>
<P><FONT SIZE=3D2>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></FONT></P>
<BR>
<P><FONT SIZE=3D2>Lisa Rutland Koivu</FONT>
<BR><FONT SIZE=3D2>Oracle Database Administrator</FONT>
<BR><FONT SIZE=3D2>Qode.com</FONT>
<BR><FONT SIZE=3D2>4850 North State Road 7</FONT>
<BR><FONT SIZE=3D2>Suite G104</FONT>
<BR><FONT SIZE=3D2>Fort Lauderdale, FL 33319</FONT>
</P>
<P><FONT SIZE=3D2>V: 954.484.3191, x174</FONT>
<BR><FONT SIZE=3D2>F: 954.484.2933 </FONT>
<BR><FONT SIZE=3D2>C: 954.658.5849</FONT>
<BR><FONT SIZE=3D2><A HREF=3D"http://www.qode.com" =
TARGET=3D"_blank">http://www.qode.com</A></FONT>
</P>
<P><FONT SIZE=3D2>"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."</FONT></P>
<BR>
<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Emine ATES [<A =
HREF=3D"mailto:emineates_at_postmaster.co.uk">mailto:emineates_at_postmaster.c= o.uk</A>]</FONT>
<BR><FONT SIZE=3D2>Sent: Tuesday, December 12, 2000 11:44 AM</FONT>
<BR><FONT SIZE=3D2>To: Multiple recipients of list ORACLE-L</FONT>
<BR><FONT SIZE=3D2>Subject: Re: Your opinion please...RBS</FONT>
</P>
<BR>
<P><FONT SIZE=3D2>Dear Lisa</FONT>
<BR><FONT SIZE=3D2>I think your problem is having too few rollback =
segments .</FONT>
<BR><FONT SIZE=3D2>As you know Oracle shares transactions between =
rolback segments acc to their active transaction count.In your case =
</FONT>
<BR><FONT SIZE=3D2>you have only one rollback segment so all =
transactions must share it. You can make it bigger and bigger, but you = should</FONT>
<BR><FONT SIZE=3D2>also think about transaction table of it, there may =
be congestion on the transaction table of rbs.</FONT>
<BR><FONT SIZE=3D2>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.</FONT></P>
<P><FONT SIZE=3D2>Good luck</FONT>
<BR><FONT SIZE=3D2>-- </FONT>
<BR><FONT SIZE=3D2>Please see the official ORACLE-L FAQ: <A =
HREF=3D"http://www.orafaq.com" = TARGET=3D"_blank">http://www.orafaq.com</A></FONT>
<BR><FONT SIZE=3D2>-- </FONT>
<BR><FONT SIZE=3D2>Author: Emine ATES</FONT>
<BR><FONT SIZE=3D2> INET: emineates_at_postmaster.co.uk</FONT>
</P>
<P><FONT SIZE=3D2>Fat City Network Services -- (858) =
538-5051 FAX: (858) 538-5051</FONT>
<BR><FONT SIZE=3D2>San Diego, =
California -- Public Internet = access / Mailing Lists</FONT>
<BR><FONT =
SIZE=3D2>---------------------------------------------------------------= -----</FONT>
<BR><FONT SIZE=3D2>To REMOVE yourself from this mailing list, send an =
E-Mail message</FONT>
<BR><FONT SIZE=3D2>to: ListGuru_at_fatcity.com (note EXACT spelling of =
'ListGuru') and in</FONT>
<BR><FONT SIZE=3D2>the message BODY, include a line containing: UNSUB =
ORACLE-L</FONT>
<BR><FONT SIZE=3D2>(or the name of mailing list you want to be removed =
from). You may</FONT>
<BR><FONT SIZE=3D2>also send the HELP command for other information =
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