Trying to understand the locking behavior of GTTs (Global Temporary Tables) : (GTT_T is a GTT. T is a regular table) SQL> insert into gtt_t values (1000); 1 row created. SQL> select object_name, object_type, a.object_id, b.locked_mode from dba_objects a, v$locked_object b where a.object_id=b.object_id; no rows selected SQL> insert into gtt_t select *from T; 1 row created. SQL> select object_name, object_type, a.object_id, b.locked_mode from dba_objects a, v$locked_object b where a.object_id=b.object_id; OBJECT_NAME OBJECT_TYPE OBJECT_ID OBJECT_ID LOCKED_MODE ---------------------------------------------------------------- GTT_T TABLE 204835 204835 3 The user acquires a lock on the GTT for performing DML ONLY when selecting from a Non-GTT. 1. How is this different from the first insert on GTT? (In either case, I noticed a 'TO' lock-type in v$lock) 2. Where can I find more info on GTT-peculiarities ? TIA, Ravi. ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------