RE: GTT Locks

From: Ravi Kulkarni <kulkarni.ravi_at_heb.com>
Date: Tue, 02 Mar 2004 18:37:44 -0600
Message-id: <0HTZ00KZD5QXD6@sys98049.heb.com>

Sorry .. I should have mentioned. I am on 9204(solaris8). Is this a "New Feature" of 92 then ?

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Connor McDonald Sent: Tuesday, March 02, 2004 6:28 PM
To: oracle-l_at_freelists.org
Subject: Re: GTT Locks

I don't observe your results on a system here (8174) - the entry appears in v$locked_object.

SQL> insert into GTT values (1);

1 row created.

SQL> select object_name, object_type, a.object_id, b.locked_mode from dba_objects a,   2 v$locked_object b where a.object_id=b.object_id;

OBJECT_NAME                              OBJECT_TYPE         OBJECT_ID LOCKED_MODE
---------------------------------------- ------------------ ---------- -----------
GTT                                      TABLE                  102302           3

hth
connor

• Ravi Kulkarni <kulkarni.ravi_at_heb.com> wrote: > 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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  ---

Connor McDonald

Co-author: "Mastering Oracle PL/SQL - Practical Solutions" - available now
web: http://www.oracledba.co.uk
web: http://www.oaktable.net

email: connor_mcdonald_at_yahoo.com

"GIVE a man a fish and he will eat for a day. But TEACH him how to fish, and...he will sit in a boat and drink beer all day"                                   

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Received on Tue Mar 02 2004 - 18:34:34 CST