Oracle Database 11 g - Online Public Access Catalog

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440 CHAPTER 10 ■ DATA GUARDCustomize Fast-Start Failover EventsOracle Database 11g Data Guard Broker introduces numerous enhancements to the DataGuard Manager command-line interface. Enhancements include the ability to customize whatinitiates the fast-start failover conditions. Prior to Oracle Database 11g, the fast-start failoverconditions were induced by database health checks provided by Oracle. Now, the fast-startfailover can be induced by certain configurable conditions. For example, the fast-restart failoverprocess can be initiated when the primary database archivelog destination runs out of space bysetting the fast_start_failover condition to the value of Stuck Archiver:DGMGRL> enable fast_start failover condition "Stuck Archiver"Succeeded.Alternatively, you can enable the fast_start failover condition for a specified ORA- errormessage. Although you would never want to fail over from just an ORA-600 error message, thefollowing example is provided to demonstrate the ease of specifying a generic ORA-600 errorcondition:DGMGRL> enable fast_start failover condition 600;Succeeded.If you issue the new show fast_start failover status command in Data Guard Broker, itreports that the ORA-600 error will initiate a failover:DGMGRL> show fast_start failover;Fast-Start Failover:Threshold:Target:Observer:Lag Limit:Shutdown Primary:Auto-reinstate:ENABLED45 secondsdba11gbpo40.dbaexpert.com30 secondsFALSETRUEConfigurable Failover ConditionsHealth Conditions:Corrupted ControlfileCorrupted DictionaryInaccessible LogfileStuck ArchiverDatafile OfflineYESYESNOYESYESOracle Error Conditions:ORA-00600: internal error code, arguments:[%s], [%s], [%s], [%s], [%s], [%s], [%s], [%s]Now, the show configuration verbose command also displays fast-start failover–relatedinformation.
CHAPTER 10 ■ DATA GUARD 441■Tip DBAs often get surprised when they realize that commands to DGMGRL can also be scripted. DBAs canissue commands in the command-line interface by invoking dgmgrl in Unix similar to what is shown here:DBA11g $ dgmgrl sys/oracle "edit database 'dba11g'set property faststartfailovertarget='DBA11gDR';"DGMGRL for Linux: Version 11.1.0.4.0 - BetaCopyright (c) 2000, 2005, Oracle. All rights reserved.Welcome to DGMGRL, type "help" for information.Connected.Property "faststartfailovertarget" updateddgmgrl sys/oracle "edit database 'dba11gdr'set property faststartfailovertarget='DBA11g';"Initiate Fast-Start Failover from ApplicationsOracle Database 11g also introduces the new DBMS_DG PL/SQL package, which can be customizedby applications to initiate a request for fast-start failover of the primary database. DataGuard Broker will perform some preliminary validations such as checking the readiness of thefailover state or checking that the lag limit is within the threshold on the primary database andcommunicates with the observer to initiate a failover. If no parameters are specified, the defaultstring of “Application Failover Requested” will be logged in the broker log file and in the databasealert log file. You can see from the function description here that the function expects acondition string for the fast-start failover:SQL> desc dbms_dgFUNCTION INITIATE_FS_FAILOVER RETURNS BINARY_INTEGERArgument Name Type In/Out Default?------------------- ------------- ---------------CONDSTR VARCHAR2 INThis function can return any one of the following return codes:• ORA-00000: Normal, successful completion.• ORA-16646: Fast-start failover is disabled.• ORA-16666: Unable to initiate fast-start failover on a standby database.• ORA-16817: Unsynchronized fast-start failover configuration.• ORA-16819: Fast-start failover observer not started.• ORA-16820: Fast-start failover observer is no longer observing this database.• ORA-16829: Fast-start failover configuration is lagging.You can query the V$FS_FAILOVER_STATS dynamic view on the primary database toobtain the cause of failure information and when it occurred, as shown here:
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The EXPERT’s VOIce ® IN ORACLEAl
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Contents at a GlanceAbout the Autho
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■CONTENTSixSQL*Plus New Features
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■CONTENTSxiEnterprise Manager Int
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■CONTENTSxiiiCombined Capture and
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xxii■ACKNOWLEDGMENTSNothing I do
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xxiv■INTRODUCTIONPerformance Mana
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CHAPTER 7■ ■ ■Data PumpDBAs a
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CHAPTER 7 ■ DATA PUMP 315if test
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CHAPTER 7 ■ DATA PUMP 319Encrypti
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CHAPTER 7 ■ DATA PUMP 323Remappin
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CHAPTER 7 ■ DATA PUMP 325SELECT d
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566 ■INDEXadvise failure command,
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