RE: GTT Locks
- From: Ravi Kulkarni <kulkarni.ravi@xxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Tue, 02 Mar 2004 18:37:44 -0600
Sorry .. I should have mentioned. I am on 9204(solaris8).
Is this a "New Feature" of 92 then ?
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Connor McDonald
Sent: Tuesday, March 02, 2004 6:28 PM
To: oracle-l@xxxxxxxxxxxxx
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@xxxxxxx> 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@xxxxxxxxx
"GIVE a man a fish and he will eat for a day. But TEACH him how to fish,
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