Performance Tunning

Hello
I use this query to find the LIST OF THE LOCKED OBJECT

SELECT a.type,
Owner of substr (a.Owner, 1, 30),
a.SID,
Subject substr (a.Object, 1, 30)
ACCESS $ v one
WHERE a.owner NOT IN ('SYS', 'PUBLIC')
ORDER BY 1,2,3,4

It showing record 9475 is this straight becauze some slow EEG database time.

I have another problem in a different database that generates a lot of trc file, in the file dir udump

Thank you
MAAN

Hello

Documentation says Oracle

«v$ ACCESS displays information about locks that are currently taxed on the library cache objects.» The locks are imposed to ensure that they are not aged in the cache of the library so that they are required for the execution of SQL".

It is provides information what objects are held level access will hide library in the special case of sessions. It does not provide the information that it possΦde a lock or not.

Session - 1 as a dba

SQL> select owner,type,count(*)
  2  from v$access
  3  where owner='SCOTT'
  4  group by owner,type;

no rows selected

Session - scott 2

SQL> desc emp
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 EMPNO                                     NOT NULL NUMBER(4)
 ENAME                                              VARCHAR2(10)
 JOB                                                VARCHAR2(9)
 MGR                                                NUMBER(4)
 HIREDATE                                           DATE
 SAL                                                NUMBER(7,2)
 COMM                                               NUMBER(7,2)
 DEPTNO                                             NUMBER(2)

SQL> select * from emp where rownum < 2;

     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM
---------- ---------- --------- ---------- --------- ---------- ----------
    DEPTNO
----------
      7369 SMITH      CLERK           7902 17-DEC-80        800
        20

Session - 1

SQL> col type for a20
SQL> /

OWNER                TYPE                   COUNT(*)
-------------------- -------------------- ----------
SCOTT                TABLE                         1

If you check it has loaded in the library cache - as the object is accessed by the user. We will still continue with demo

SQL> grant all on emp to public;

Grant succeeded.

SQL> update emp
  2  set sal=sal+1000
  3  where empno=7369;

1 row updated.

SQL>

I did not commit the session.

Session - 3 - one access s/n

C:\Windows\system32>sqlplus /@test as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Thu Mar 24 12:32:35 2011

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> update scott.emp set sal=sal-100 where empno=7369;

It is passed, we will check session - 1 What is happeing

SQL> col owner for a20
SQL> col object for a20
SQL> col type for a20
SQL> select * from v$access where object='EMP';

       SID OWNER                OBJECT               TYPE
---------- -------------------- -------------------- ---------
        25 SCOTT                EMP                  TABLE
        24 SCOTT                EMP                  TABLE

It is only provides information session at which are currently access what are the objects of the library cache. If you check 25 SID and SId 24 both are perhaps to access the information, which is the trainer /waiter that we do not know. Now, if you check the v$ locked_object you can get the details.

If you check the base tables - it recovers since "x$ ktcxb"-information of transactions of the v kernel $ locked_object
When in access of $ v it retrieves information from x$ kglob and x$ kgldp - its generic kernel - object they access dependencies - architecture/logical point of view.

There will be cases occurs when locking contention access $ v is questioned through - because high latch activity goes on access tables x $.

Note-in order to understand things that I provided table core information do not have to access the core production database tables.

It could be that useful...

-Pavan Kumar N

Tags: Database

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