RE: GTT Locks
- From: Ravi Kulkarni <kulkarni.ravi@xxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Wed, 03 Mar 2004 11:15:18 -0600
John,
The table GTT needs to be a Global Temporary table.
SQL> create table gtt (n1 number);
needs to be
SQL> CREATE GLOBAL TEMPORARY TABLE GTT (n1 number) on commit preserve rows;
Thanks,
Ravi.
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Jonathan Lewis
Sent: Wednesday, March 03, 2004 12:51 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: GTT Locks
9.2.0.4:
SQL> create table gtt (n1 number);
Table created.
Elapsed: 00:00:00.00
SQL> select sid, username from v$session where user_name = 'TEST_USER';
SID USERNAME
---------- ------------------------------
16 TEST_USER
1 row selected.
Elapsed: 00:00:00.00
SQL> select * from V$lock where sid = 16;
no rows selected
Elapsed: 00:00:00.00
SQL> insert into gtt values(1);
1 row created.
Elapsed: 00:00:00.00
SQL> select * from V$lock where sid = 16;
ADDR KADDR SID TY ID1 ID2 LMODE REQUEST
CTIME BLOCK
-------- -------- ---------- -- ---------- ---------- ---------- ----------
------ ----------
67B84268 67B84374 16 TX 196647 7419 6 0
0 0
67B4E074 67B4E088 16 TM 30492 0 3 0
0 0
2 rows selected.
Object 30492 is the table definition for the GTT,
so I'm not reproducing your result.
In passing - has anyone got a system with an
object_id in excess of 2^22 ? If so, what happens
when you use a GTT. The OBJ column from x$BH
for GTT data is reported as the relative data block
address of the first block of the segment - and if
you have a 'default' build this means a GTT could
use the value power(2,22) + 8. So what happens
if you have got through 4 million or so table, partition
and index definitions, and have a real object at that
number ?
Regards
Jonathan Lewis
http://www.jlcomp.demon.co.uk
The Co-operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html
March 2004 Hotsos Symposium - The Burden of Proof
Dynamic Sampling - an investigation
March 2004 Charlotte OUG (www.cltoug.org) CBO Tutorial
April 2004 Iceland
June 2004 UK - Optimising Oracle Seminar
----- Original Message -----
From: "Ravi Kulkarni" <kulkarni.ravi@xxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Sent: Tuesday, March 02, 2004 10:51 PM
Subject: GTT Locks
> 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.
>
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