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GV$ QUERY FAILS WITH ORA-19202 ORA-12850 (Doc ID 2361532.1)

Last updated on MARCH 01, 2019

Applies to:

Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

NOTE: In the images and/or the document content below, the user information and data used represents fictitious

data from the Oracle sample schema(s) or Public Documentation delivered with an Oracle database product. Any similarity to actual persons, living or dead,

is purely coincidental and not intended in any manner.

 

When attempting to SELECT XMLTYPE(
  CURSOR(
  SELECT 'Source: ENG-OSS_OSSPMP03_BlockingSessions.sql' report, welvih.*
  FROM (WITH lk
  AS ( SELECT 'Session with SID '
  || s.SID
  || ' (Instance: '
  || l.inst_id
  || ' Prog: '
  || s.PROGRAM
  || ' User: '
  || s.username
  || ' Machine: '
  || s.machine
  || ') is '
  || DECODE(l.BLOCK, 0, 'waiting for', 'blocking')
  || ' the object: '
  || object_name
  || ' (LOCK_TYPE: '
  || DECODE(l.TYPE
  ,'RT', 'Redo Log Buffer'
  ,'TD', 'Dictionary'
  ,'TM', 'DML'
  ,'TS', 'Temp Segments'
  ,'TX', 'Transaction'
  ,'UL', 'User'
  ,'RW', 'Row Wait'
  ,l.TYPE)
  || ' LOCK_MODE: '
  || DECODE(l.lmode
  ,0, 'None'
  ,1, 'Null'
  ,2, 'Row Share'
  ,3, 'Row Excl.'
  ,4, 'Share'
  ,5, 'S/Row Excl.'
  ,6, 'Exclusive'
  ,LTRIM(TO_CHAR(lmode, '990')))
  || ' LOCK_STATUS: '
  || DECODE(l.BLOCK, 0, 'Not Blocking', 1, 'Blocking', 2, 'Global')
  || ')'
  TEXT
  ,s.SID
  FROM gv$lock l
  JOIN gv$session s
  ON (l.inst_id = s.inst_id
  AND l.SID = s.SID
  AND s.username != 'SYS')
  JOIN gv$locked_object o
  ON (o.inst_id = s.inst_id
  AND s.SID = o.session_id)
  JOIN dba_objects d ON (d.object_id = o.object_id)
  WHERE (l.id1, l.id2, l.TYPE) IN (SELECT id1, id2, TYPE
  FROM gv$lock
  WHERE request > 0)
  AND L.CTIME > 60
  ORDER BY id1, id2, ctime DESC)
  SELECT -- OK Alarm
  'osspmp03' APPLICATION
  ,'BlockingSession_<*>' OBJECT
  ,'ENG-OSS' MESSAGE_GROUP
  ,0 SEVERITY
  , -- Info(4), Warning(1), Critical(2)
  'No blocking session found' TEXT
  ,'' INSTRID
  ,'' NOTIFICATION
  ,'' SN
  ,'' TYPE
  ,'' PERF_CURRENT
  ,'' PERF_WARNING
  ,'' PERF_CRITICAL
  ,'' PERF_MAX
  FROM DUAL
  WHERE NOT EXISTS (SELECT TEXT FROM lk)
  UNION ALL
  SELECT 'osspmp03' APPLICATION
  , 'BlockingSession_'
  || SID
  OBJECT
  ,'ENG-OSS' MESSAGE_GROUP
  ,CASE WHEN TEXT LIKE '%CPDADMIN%' THEN 4 ELSE 1 END SEVERITY
  , -- Info(4), Warning(1), Critical(2)
  TEXT
  ,'' INSTRID
  ,'' NOTIFICATION
  ,'' SN
  ,'' TYPE
  ,'' PERF_CURRENT
  ,'' PERF_WARNING
  ,'' PERF_CRITICAL
  ,'' PERF_MAX
  FROM lk) welvih)).getClobVal()
  viewname
  FROM DUAL;,
the following error occurs.

ERROR
-----------------------

ERROR:
ORA-19202: Error occurred in XML processing
ORA-12850: Could not allocate slaves on all specified instances: 4 needed, 1
allocated
ORA-06512: at "SYS.XMLTYPE", line 343
ORA-06512: at line 1

The inner cursor works fine - only fails with SELECT XMLTYPE

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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