GTT Locks

From: Ravi Kulkarni <kulkarni.ravi_at_heb.com>
Date: Tue, 02 Mar 2004 16:51:42 -0600
Message-id: <0HTZ00KSZ0U7D6@sys98049.heb.com>

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

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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.

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Received on Tue Mar 02 2004 - 16:48:33 CST