Hi Karol,
This advice is based on our experience - disabling file cache for big
databases (definitely larger than RAM size) leads to slowness.
I don't have explanation for this on the theoretical level.
If you have real-world example when Firebird works faster without file
cache, please provide details about it.
Regards,
Alexey Kovyazin
IBSurgeon
On 09.01.2019 10:57, liviuslivius liviusliv...@poczta.onet.pl
[firebird-support] wrote:
Hi,
i have read on http://firebirdsql.org/
article "23 More Ways To Speed Up Firebird".
Can you explain me point "12. Don't forget to enable file cache with
big Firebird cache page".
I can imagine difference only in 2 situations.
1. When all attachments are disconnected and connected again.
Then yes, Windows cache can be more than benefit here - but we can
turn on linger to achive near the same.
2. Database is bigger than Firebird cache.
Than using also system cache can increase performance as there is a
chance that Windows will cache some portion of database not cached by
FB itself.
And Windows can decide then, if it neeed cache other files or some
portion of DB.
Is there any benefit of enabling system cache if Firebird cache is set
to bigger value than database itself?
I see oposite performance in such situation.
But difference is marginally from 0 to 5% difference - than i do not
know if there is any difference or i see some other process involved.
Arethere other situations when enabling system cache will benefit also?
regards,
Karol Bieniaszewski
