--- In firebird-support@yahoogroups.com, Jesus Garcia wrote:

>
> Two days ago, we moved from one server with interbase 2009 windows 2003 and
> 4 Gb RAM to Firebird 2.5.2 Superclassic, 16 Gb RAM
> The database is around 21 Gb, and yesterday seems all was running fine.
>
> Today, i have checked Firebird.log and i have seen that there is an error
> of type
> 1296554 page type 4 lock denied (216), and page type 4 lock denied in
> another page, that are logged from .
>
> viewing monitoring tables, i have seen on transaction opened for 4 hours,
> and i have tried to delete de attachment. When i have deleted it, firebird
> has crashed and around 130 users has been dropped. After that in
> Firebird.log, i see no information about the crash, and i don't know what
> can happen, and what to do, and where look up for the reason of the problem.

Tune OS to produce crash dumps.

> After that crash, I see in the log page 1296554, page type 4 lock
> conversion denied (215), and don'n know what to do with this errors.
>
> Another problem is that transactions_id jumps, 20000, and 30000 in one
> minute.

This is your starting point - find why it "jumps", fix it and you'll never
see "lock conversion denied" errors like above.

Regards,
Vlad