How much value you have for sequence cache? Rather often default 20 is too low. Try at least thousands. Gints 2006/4/21, johan Eriksson <johan.eriksson@xxxxxxxxxxxx>: > Hi > > we have a table that looks like this: > > CREATE table t ( > n1 NUMBER NOT NULL, > n2 NUMBER NOT NULL, <skipped> -- //www.freelists.org/webpage/oracle-l