Data Guard: attribute of element “FAST_START_FAILOVER” is undefined
Today a question came up on the Oracle list forum where the poster was complaining about the observer that start failing on an Oracle 126.96.36.199 under linux (RHEL 5) 64 bit with protection mode set as “max_availability”, I will re-formulate my answer here via this article as far as someone might be interested in more formal answer with a little bit of details
So far the Data Guard configuration with Broker is working fine and even redo is shipping from primary and applied on standby database. Here is the status so far…
DGMGRL> show configuration verbose; Configuration - aosb2_dg_config Protection Mode: MaxAvailability Databases: aosb2_wurlali - Primary database Warning: ORA-16819: fast-start failover observer not started aosb2_watt - (*) Physical standby database Warning: ORA-16819: fast-start failover observer not started (*) Fast-Start Failover target Fast-Start Failover: ENABLED Threshold: 600 seconds Target: aosb2_watt Observer: (none) Lag Limit: 30 seconds (not in use) Shutdown Primary: TRUE Auto-reinstate: TRUE Configuration Status: WARNING DGMGRL>
Broker configuration status returned with a warning, because the Fast-start-failover observer has not been started on both primary and standby databases. You can see below values of Threshold, FastStartFailoverTarget, Lag Limit configured as well.
DGMGRL> show database verbose AOSB2_wurlali; Database - aosb2_wurlali Role: PRIMARY Intended State: TRANSPORT-ON Instance(s): AOSB2 Database Warning(s): ORA-16819: fast-start failover observer not started Properties: DGConnectIdentifier = 'aosb2_wurlali' ObserverConnectIdentifier = '' LogXptMode = 'SYNC' DelayMins = '0' Binding = 'optional' MaxFailure = '0' MaxConnections = '1' ReopenSecs = '300' NetTimeout = '30' RedoCompression = 'DISABLE' LogShipping = 'ON' PreferredApplyInstance = '' ApplyInstanceTimeout = '0' ApplyParallel = 'AUTO' StandbyFileManagement = 'AUTO' ArchiveLagTarget = '0' LogArchiveMaxProcesses = '4' LogArchiveMinSucceedDest = '1' DbFileNameConvert = '' LogFileNameConvert = '' FastStartFailoverTarget = 'aosb2_watt' InconsistentProperties = '(monitor)' InconsistentLogXptProps = '(monitor)' SendQEntries = '(monitor)' LogXptStatus = '(monitor)' RecvQEntries = '(monitor)' ApplyLagThreshold = '0' TransportLagThreshold = '0' TransportDisconnectedThreshold = '30' SidName = 'AOSB2' StaticConnectIdentifier = '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=wurlali.hhs.nl)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=AOSB2_wurlali_DGMGRL)(INSTANCE_NAME=AOSB2)(SERVER=DEDICATED)))' StandbyArchiveLocation = '/u03/oradata/AOSB2/archiving/' AlternateLocation = '' LogArchiveTrace = '0' LogArchiveFormat = '%t_%s_%r.arc' TopWaitEvents = '(monitor)' Database Status: WARNING DGMGRL>
Then started the observer from the different host and below are the errors as XML conversion failed..
DGMGRL> start observer; Corrupted document <FAST_START_FAILOVER enabled="yes" MIV="1" OBID="944550964" threshold="600" obsv_recn="0" auto-reinstate="yes"><PRIMARY name="aosb2_wurlali">aosb2_wurlali</PRIMARY><STANDBY name="aosb2_watt">aosb2_watt</STANDBY></FAST_START_FAILOVER> Error: LPX-00106: Warning: attribute "obsv_recn" of element "FAST_START_FAILOVER" is undefined Error: ORA-16591: unknown field "obsv_recn" in document Error: ORA-16593: XML conversion failed Failed. DGMGRL>
11:59 AM email@example.com:~/AOSB2(observer) $ tail -f dgmgrl.log Error: LPX-00106: Warning: attribute "obsv_recn" of element "FAST_START_FAILOVER" is undefined Error: ORA-16591: unknown field "obsv_recn" in document Error: ORA-16593: XML conversion failed
User haven’t found enough useful information either from the metalink or even by google search to fix, As this issue is related to 188.8.131.52(released in Oct 2013) and may not be the listed bugs? Now enquired user with several questions and finally by the investigation came to know observer version is been used is 184.108.40.206.
firstname.lastname@example.org:~/AOSB2(observer) $ dgmgrl sys/<password>H@AOSB2_wurlali DGMGRL for Linux: Version 220.127.116.11.0 - 64bit Production Copyright (c) 2000, 2009, Oracle. All rights reserved. Welcome to DGMGRL, type "help" for information. Connected. DGMGRL>
Of course connectivity goes well but it will not allow you to start observer, The observer(client kit) should be either same version or it can be higher version than the database(RDBMS), Moreover the client kit/observer can run in any platforms as well. After notifying to user about the versions and compatibility, user able to start observer after the installation with 18.104.22.168.