Has anyone come across the "invalid type" type when querying v$access? If so, do you have any idea what might be causing it? I've searched google and metalink and absolutely nothing. Just more people asking about it. Go figure. I'm attempting to refresh a MV and have tried a number of different session parameters, but doing some digging I keep on seeing "invalid type" in v$access when it's querying a particular table. I'm also seeing the wait event "read by other session" on this table (ISO_BIDS) as well when refreshing the MV. Oracle 10.2.0.4 AIX 6.1.4 This is from a query that joins v$access and v$session. Session 217 is the MV refresh. Session 251 is another process running that is accessing the ISO_BIDS table. OWNER OBJECT_NAME TYPE SID SERIAL# USERNAME OSUSER STATUS ------------ -------------------- ---------- ---------- ---------- ------------ ------------ -------- MFSDB ISO_BIDS INVALID TY 217 46581 USER1 USER1 ACTIVE MFSDB ISO_BIDS TABLE 217 46581 USER1 USER1 ACTIVE MFSDB ISO_BIDS INVALID TY 251 8712 USER2 USER2 ACTIVE MFSDB ISO_BIDS TABLE 251 8712 USER2 USER2 ACTIVE Thanks in advance! Jeremy -- //www.freelists.org/webpage/oracle-l