fb_jamaa wrote:

> The exception crops up when i access any of the MON$* tables, even with a
> mere select statement, but not with other tables. Once i access the MON$*
> tables, new attachments to the database hang, and a detach from the
> database with the current client also hangs

Just a guess, but I'd say that Firebird doesn't actually do any
monitoring until the first time you access a MON$ table, but once you
do, every time you log in/execute a statement/etc it has to update the
MON$ tables internally. If you've made the file read-only, it can't do
that...

Dean.