Hi Bob,
In general, we recommend to apply the same configuration as at the old
server (even if it looks not very good), and compare the performance -
if there will be a problem, obviously it will be related with the new
hardware/OS.
If there will be the same performance, then you can tune firebird.conf.
If you don't know exactly how changes will work, change one parameter at
a time.
Also, you can get optimized configuration file from our web-site
http://ib-aid.com/en/optimized-firebird-configuration/
And, look at the hardware guide:
http://ib-aid.com/en/articles/firebird-hardware-guide/
Regards,
Alexey Kovyazin
IBSurgeon HQbird
We have a 127GB Firebird database that was running on Windows Server
2008 x64 with 16GB of RAM and Firebird SuperClassic v2.5.2.26539. The
database has a page size of 8192 and buffers of 6144, and ODS version
11.2.
Due to time constraints I could not do a backup+restore on the new
server, which is Windows 2012 with 32GB RAM and Firebird SuperClassic
v2.5.5.26952. However, most activity on this new server with the old
database is much slower than the old server. I'm only seeing about
1.5GB Private Bytes in use, jumping occasionally to 2.5GB with a
working set of 1.1GB and Virtual Size of 2.7 (as per Process Explorer).
The only changes that I have made to the stock Firebird.conf are as
follows:
DefaultDbCachePages = 384
FileSystemCacheSize = 50
TempBlockSize = 2048576
TempCacheLimit = 567108864
The database is comprised of many images up to 1.5MB in size, but they
are not accessed very often. The actual data size outside of these
images is probably 1/3 of the total DB size.
There are typically about 20 connections to the database servicing up
to 140 users, with a mix of read and write transactions, as well as
some reporting.
The header statistics look like this:
Database header page information:
Flags 0
Checksum 12345
Generation 106862144
Page size 8192
ODS version 11.2
Oldest transaction 103869407
Oldest active 103869408
Oldest snapshot 103869408
Next transaction 103870442
Bumped transaction 1
Sequence number 0
Next attachment ID 2991646
Implementation ID 26
Shadow count 0
Page buffers 6144
Next header page 0
Database dialect 3
Creation date Feb 2, 2014 22:06:05
Attributes force write
Variable header data:
Sweep interval: 0
*END*
I'm looking for some guidance as to how changes that should be made to
the Firebird configuration file and to the database when I do a
backup/restore. For instance, I'm sure that I want to jump to 16KB
pages, but what about buffers?
There are other services that run on this server, so I cannot use all
resources for the database. However, I believe it is provisioned well
enough that I can certainly use half of the resources - processor and
memory - without affecting the application server and web server that
are running on the same box.
Thank you for your time,
Bob M..
