library cache pin problem.

From: <Riyaj_Shamsudeen_at_i2.com>
Date: Wed, 02 May 2001 10:57:06 -0700
Message-ID: <F001.002F787E.20010502101056@fatcity.com>

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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