I think I have found the problem, and as allways Firebird runs fine. What confused me was the difference between times of transacctions, but the problem comes from a asp.net process that is continuosly creating transactions and running one query.
Sorry for waste your time and thank you for your cooperation. Regards, Jesús ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
