| Subject | RE: [firebird-support] Page Buffers - how do you know if you've got it wrong? |
|---|---|
| Author | Dunbar, Norman (Capgemini) |
| Post date | 2011-06-08T06:54:33Z |
Morning Maya,
don't use Classic flavoured Firebird which, I believe, is "sensitive"
(for want of a better word) to the number of buffers.
There was a thread some time back on this list about a really slow
"reawakening from hibernation" on a Windows system where the server I
think, went to sleep until someone connected. Then it took "ages" to
restart and run the first request from the client.
Ann and the OP did a back and forth conversation and the end result was
that the OP reduced his buffer count and all was well. I wrote up the
gist of the conversation and uploaded it to the docs location as a new
Firebird manual. You can read it online here:
http://www.firebirdsql.org/file/documentation/reference_manuals/referenc
e_material/html/fbcache-cache.html, or get the pdf here:
http://www.firebirdsql.org/file/documentation/reference_manuals/referenc
e_material/Firebird-Cache.pdf - it *might* help. This is a short
document but it tries to explain how to use the MON$ tables to figure
out whether you need a bigger or smaller cache. As with many things
database, it pays to have a working test setup.
HTH
Cheers,
Norm. (At work!)
Norman Dunbar
Contract Senior Oracle DBA
Capgemini Database Team (EA)
Internal : 7 28 2051
External : 0113 231 2051
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>> These page buffers confuse me greatly, and it seems thePersonally, I've never changed the number of buffers, but then again, I
>> correct calculation is a tricky process.
>>
>> QUESTION: how do you know if you have it wrong? ie. too high
>> or too low? What happens exactly?
don't use Classic flavoured Firebird which, I believe, is "sensitive"
(for want of a better word) to the number of buffers.
There was a thread some time back on this list about a really slow
"reawakening from hibernation" on a Windows system where the server I
think, went to sleep until someone connected. Then it took "ages" to
restart and run the first request from the client.
Ann and the OP did a back and forth conversation and the end result was
that the OP reduced his buffer count and all was well. I wrote up the
gist of the conversation and uploaded it to the docs location as a new
Firebird manual. You can read it online here:
http://www.firebirdsql.org/file/documentation/reference_manuals/referenc
e_material/html/fbcache-cache.html, or get the pdf here:
http://www.firebirdsql.org/file/documentation/reference_manuals/referenc
e_material/Firebird-Cache.pdf - it *might* help. This is a short
document but it tries to explain how to use the MON$ tables to figure
out whether you need a bigger or smaller cache. As with many things
database, it pays to have a working test setup.
HTH
Cheers,
Norm. (At work!)
Norman Dunbar
Contract Senior Oracle DBA
Capgemini Database Team (EA)
Internal : 7 28 2051
External : 0113 231 2051
Information in this message may be confidential and may be legally privileged. If you have received this message by mistake, please notify the sender immediately, delete it and do not copy it to anyone else.
We have checked this email and its attachments for viruses. But you should still check any attachment before opening it.
We may have to make this message and any reply to it public if asked to under the Freedom of Information Act, Data Protection Act or for litigation. Email messages and attachments sent to or from any Environment Agency address may also be accessed by someone other than the sender or recipient, for business purposes.
If we have sent you information and you wish to use it please read our terms and conditions which you can get by calling us on 08708 506 506. Find out more about the Environment Agency at www.environment-agency.gov.uk