Question with lock script - phantom objects

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Mon, 06 Oct 2003 07:29:30 -0800
Message-ID: <F001.005D22BE.20031006072930@fatcity.com>

Hi all,

I am using following script to see locks in the DB. Do you see any problems with it?

• cut here ===================== connect / as sysdba set linesize 200 feedback off heading on pagesize 100 column sid format a9 column res heading 'Resource Type' format a15 trunc column id1 format 9999999 noprint column id2 format 9999999 noprint column lmode heading 'Lock Held' format a14 column request heading 'Lock Req.' format a14 column serial# format 99999 column username format a10 column terminal heading Term format a8 column table_name format a20 trunc column owner format a10 column inst_id format a5 select --+ no_merge(l) no_merge(s) (select instance_name from sys.gv_$instance where instance_number = l.inst_id) inst_id, l.sid || ',' || s.serial# sid, s.username, replace(s.terminal,'WTS-') terminal, decode(l.type,
  'RW','RW-Row Wait Enq',
  'TM','TM-DML Enq',
  'TX','TX-Trans Enq',
  'UL','UL-User',l.type||'-System') res,
  t.name table_name,u.name owner, l.id1,l.id2, decode(l.lmode,1,'No Lock', 2,'Row Share', 3,'Row Excl', 4,'Share', 5,'Shr Row Excl', 6,'Excl',null) lmode, decode(l.request,1,'No Lock', 2,'Row Share', 3,'Row Excl', 4,'Share', 5,'Shr Row Excl', 6,'Excl',null) request from sys.gv_$lock l, sys.gv_$session s, sys.user$ u,sys.obj$ t where l.sid = s.sid and s.type != 'BACKGROUND' and t.obj# = l.id1 and u.user# = t.owner# and l.inst_id = s.inst_id / prompt set feedback on prompt exit
• cut here =====================

Btu here is the problem ... once in a while (aka many times a day) when we run this script, we see objects as locked by some user which should NEVER be even accessed. We have one schema that deals with out affiliates, and it is practically independent of other schema in the database. Still sometimes we see objects within the affiliate schema beign accesses by other users who have nothing to do (or the code they execute has nothing to do) with the objects displayed in the list.

One peculier thing I have noted, is affiliate schema used private synonyms and the objects listed in the lock scripts are _always_ private synonyms pointing to objects in the affiliate schema and the private synonym belongs to the user who is _not_ the locking user.

e.g.

ABC1 47,820 BROWNBRE BRS02 TX-Trans Enq SYSTEM_NETWORK_HIST MURPHYM Excl

here locking user ius brownbre locking system_network_hist owned by murphym. Actually the table is owned by affiliate and murphym has a private synonym to the table.

Any clues? DB is 9202 RAC.
TIA
Raj

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Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art !

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Author: Jamadagni, Rajendra
  INET: Rajendra.Jamadagni_at_espn.com

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Received on Mon Oct 06 2003 - 10:29:30 CDT