Ok thanks for this info. By default, I used Forced Writes OFF, I think
I would change it ;)

For Vista performance problem, its definitly not with Forced Writes.

Maybe an antivirus ?

Regards

Alexandre

--- In firebird-support@yahoogroups.com, "Leyne, Sean" <Sean@...> wrote:
>
>
>
> > - when Firebird is ended abnormally (ie UDF problem...) with a
> > database connected, it could corrupt it if forced writes is OFF ?
>
> Yes.
>
> Further if the physical server abends (power is lost for longer than UPS
> can support) then a corruption can occur.
>
>
> > - if you shutdown Firebird server normally, same problem or everything
> > is properly closed ?
>
> No. This should not be a problem, but it does depend on the OS.
>
> Some OS (like Windows) can buffer writes independent of the application.
>
>
> > and decrease of performance is 3x less always ?
>
> Yes, but don't think of the performance as degraded, think of the
> non-Forced Writes as DANGEROUS.
>
> Nothing comes for free, better slow database writes then a database
> which is corrupt!
>
> Also, the Forced Write 'penalty' can be minimized by using good disk
> controller *with* battery backed-up cache, which can allow you to enable
> the "write-back" feature of the controller. (Write-back immediately
> tells the OS that the disk write has occurred even though the controller
> may still have the write in its cache).
>
>
> Sean
>