Another method would be to make use of application locks to actually create serial access to sequences. This can be achieved by using dbms_application_info to update v$session and then referring this value for releasing resources to one session at a time. I have used this logic in different scenarios to avoid two sessions from using the same resource. has worked perfectly. http://www.databasejournal.com/features/oracle/article.php/3321961/Use-Oracles-DBMSAPPLICATIONINFO-to-Prevent-Routines-from-Running-Simultaneously.htm Thanks! Amar Www.amar-Padhi.com -original message- Subject: Re: Grabbing sequence values blocks in consecutive order: Need a guaranteed method. -- //www.freelists.org/webpage/oracle-l