Thank you for the replies :

>What is the size of the database pages?

>Have you checked the DB level Page Cache setting (the DB can have a different value from the config)?

>How much RAM is available for the VM?

Sean, theres 13gb of RAM, and no db with specific settings

Page size is 16k

>*EACH DATABASE* will be consuming up to (50000 * page size) on cache.

>Why do you set DefaultDbCachePages so high???? The Firebird server

>needs RAM for more things than just the cache.

Helen, pages are high only because I copied the suggested values from the config at https://ib-aid.com/br/optimized-firebird-configuration/

Since it is the first time we're using superserver we went for these recommended settings.

Isn't the page cache shared in this mode on firebird 3 (50000 pages for all dbs) ?

Also, I've set the temp directories now as you suggested.

And there is plenty of HD space available.

>Which version (exact buildnumber)?

Mark, server version is WI-V6.3.2.32703