Raj, >Any pointers to good articles on using and sizing P_A_T? config is >9204/AIX/RAC. In one of the DBs a sr. dba has PAT enabled, but >occasionally the DB throws ora-4031 and we end up bouncing the Might be worth checking for the presence of LARGE_POOL_SIZE.... PQ buffers use the large pool (along with MTS, RMAN and a few others?) John Kanagaraj <>< DB Soft Inc Phone: 408-970-7002 (W) Fear connects you to the Negative, but Faith connects you to the Positive! I Jn 4:18 ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** -- http://www.freelists.org/webpage/oracle-l