HI,everybody: recently i found some errors in pg_log when i do some pressure testing,looks like "2013-01-05 21:48:29.870 CST,"postgres","wedding",15850,"172.25.10.28:37100",50e82f2d.3dea,1,"SELECT",2013-01-05 21:48:29 CST,19/80509,0,ERROR,55000,"currval of sequence ""t_wedding_wedding_id_seq"" is not yet defined in this session" ,,,,,," SELECT currval('t_wedding_wedding_id_seq')as weddingId ",,,"" 2013-01-05 21:48:29.984 CST,"postgres","wedding",15856,"172.25.10.28:37123",50e82f2d.3df0,1,"SELECT",2013-01-05 21:48:29 CST,25/91770,0,ERROR,55000,"currval of sequence ""t_wedding_wedding_id_seq"" is not yet defined in this session" ,,,,,," SELECT currval('t_wedding_wedding_id_seq')as weddingId " the code is begin; insert into t_wedding(wedding_id,share_id,share_type,user_id,wedding_time) select nextval('t_wedding_wedding_id_seq') ,#ShareId#,#shareType#,#userId#,#weddingTime# <selectKey resultClass="int" keyProperty="weddingId"> SELECT currval('t_wedding_wedding_id_seq')as weddingId </selectKey> ; COMMIT; the column wedding_id type is serial + primary key, and i set the sequence cache from 1 to 50,errors still exists,but reduced。 I use ibatis,but it seems not support returning wedding_id !!! MY environment: Postgres 9.1.2 ibatis pgbouncer ( Transaction mode ) Postgres-9.1-901.jdbc4.jar as my drive As i used *begin * to wrapped it as a transaction, then why zhe errors still occurs ? -- View this message in context: http://postgresql.1045698.n5.nabble.com/currval-of-sequence-xxx-seq-is-not-yet-defined-in-this-session-tp5738893.html Sent from the PostgreSQL - general mailing list archive at Nabble.com. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general