Not the cause, but at the very least the place to start is LAST_DDL_TIME for base tables in dba_objects. Igor ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Stephens, Chris Sent: Thursday, September 21, 2006 10:45 AM To: ORACLE-L Subject: invalid views One of our developers is noticing that several of his views have become invalid each day over the past serveral days. He claims that no ddl is occuring on the base tables and that know functions the views are dependant on are changing. Is there any way to track down the cause of the invalidations? Thanks! CONFIDENTIALITY NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient or the employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by email reply.