RE: library cache pin problem.

From: Steve Adams <steve.adams_at_ixora.com.au>
Date: Thu, 03 May 2001 05:13:39 -0700
Message-ID: <F001.002F8285.20010503050047@fatcity.com>

Hi Riyaj,

The grant needs to invalidate the cached meta data for DBMS_PIPE in the library cache. The X pin is required for the invalidation.

@ Regards,
@ Steve Adams
@ http://www.ixora.com.au/
@ http://www.christianity.net.au/

-----Original Message-----
Sent: Thursday, 3 May 2001 4:11
To: Multiple recipients of list ORACLE-L

I am trying to grant execute on dbms_pipe package to user userA. My session was hanging. So I went to v$session_wait to find why my session is hanging. My session was waiting for library cache pin. I looked at x$kglpn, x$kglob and saw that my statement was requesting the library cache pin on exclusive mode(3) and few sessions were executing PL/SQL blocks with calls to dbms_pipe.unpack_message (so holding the same library cache pin in shared mode). My questions is why would 'grant' will request the library cache pin in exclusive mode. I am not even granting to the same user who is holding the pin. Any ideas ?

SQL> l
  1 SELECT
  2 a.KGLPNMOD, a.KGLPNREQ, b.username, c.KGLNAOBJ,   3 c.KGLOBTYP
  4 FROM

  5  x$kglpn a,
  6  v$session b,
  7  x$kglob c

  8 WHERE
  9 a.KGLPNUSE = b.saddr and
10 --upper(c.KGLNAOBJ) like upper('%testpkg%') and 11 a.KGLPNHDL = c.KGLHDADR
12* and c.kglnaobj='DBMS_PIPE'
SQL> /
  KGLPNMOD KGLPNREQ USERNAME KGLNAOBJ KGLOBTYP

---------- ---------- -------------------- -------------------- ----------
         2          0 TEST_USER3           DBMS_PIPE                     9
         2          0 TEST_USER3           DBMS_PIPE                    11
         2          0 TEST_USER3           DBMS_PIPE                     9
         2          0 TEST_USER3           DBMS_PIPE                    11
         2          0 TEST_USER3           DBMS_PIPE                     9
         2          0 TEST_USER3           DBMS_PIPE                    11
         0          3 SYS                  DBMS_PIPE                     9
         2          0 TEST_USER3           DBMS_PIPE                     9
         2          0 TEST_USER3           DBMS_PIPE                    11

Thanks
Riyaj "Re-yas" Shamsudeen
Certified Oracle DBA
i2 technologies www.i2.com

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Author: Steve Adams
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Received on Thu May 03 2001 - 07:13:39 CDT