Oracle Database 11 g - Online Public Access Catalog

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428 CHAPTER 10 ■ DATA GUARD7. Switch the binary to the new Oracle software version. At this point, both sites will berunning the new version of Oracle software.8. Start up in mount mode.9. Start MRP, and make sure that both databases are in sync.Your database will be synchronized again running the new version of Oracle software. Youcan perform a switchover again to bring the primary database back to the original data center.At this point, both sites are running the new version of Oracle software with the original DataGuard configuration.Improvements in Redo TransportOne of the changes made to the redo log transport mechanism in Oracle now defaults to asynchronousmode. In Oracle Database 11g, the default behavior of the log transport mechanismis set to asynchronous mode. One way to confirm the new default asynchronous redo transportmode is to invoke the Data Guard command-line interface (DGMGRL) and review the verboseoutput from the SHOW command. You will notice that the last line of the following output(logxptmode=async) reflects the asynchronous mode of redo transport:DGMGRL> show database verbose dba11gdrDatabaseName:dba11gdrRole:PHYSICAL STANDBYEnabled:YESIntended State:APPLY-ONInstance(s):DBA11gDRProperties:DGConnectIdentifier= 'dba11gdr'ObserverConnectIdentifier = ''LogXptMode= 'async'The redo transport mechanism in Oracle Database 11g can also take advantage of authenticationusing SSL. The redo transport network transmission sessions can now use the remotelogin password file to perform encrypted SSL connections.Block Change Tracking SupportOracle Database 10g introduced the block change tracking feature to improve incrementalbackup performance. Block change tracking enables fast incremental RMAN backups byreading and backing up only the changed data blocks during incremental backups. OracleDatabase 11g allows for block change tracking on the Data Guard configuration. To enableblock change tracking, you can submit a SQL statement similar to the following example on thestandby database:
CHAPTER 10 ■ DATA GUARD 429SQL> alter database enable block change tracking using file '+DATA';Database altered.This example enables block change tracking and places the file in the DATA diskgroup.■Note Use of real-time query or RMAN block-change tracking on a Data Guard standby database requiresa license for Oracle Active Data Guard.BCT enabled on the standby database provides greater ammunition to leverage backupsat the disaster recovery site. Performing backups on the disaster recovery site can offloadresources on the primary data center.RMAN Understands Data Guard ConfigurationsPreviously, DBAs had to create a standby controlfile from the primary database and push thecontrolfile using sftp/scp to the standby database server to create a physical standby database.Oracle Database 11g eliminates this step. Using the RMAN repository, you are able to registerthe physical standby database. Once you register the standby database with RMAN, RMAN has theability to resynchronize file names and update the information back in the controlfile byperforming a reverse resynchronization. This is an automatic process on physical standbydatabases.Improved Integration with RMANThere are numerous improvements made to RMAN integration with Data Guard. The majorityof these improvements revolve around the db_unique_name parameter and the ability to maintainsite persistence. Improvements relative to RMAN and Data Guard integration include theability to do the following:• Restore a standby controlfile from an existing controlfile backup.• Set up persistent configuration at the site level instead of connecting to a database as atarget using the new db_unique_name option.• Back up, restore, and recover works transparently with any database configuration.• Back up the spfile based on db_unique_name.• Define a backup accessibility group.Please refer to Chapter 6 for additional details.Compressed Redo TrafficOracle Database 11g introduces the capability to compress redo log data as it transports overthe network to the standby databases. This is an important feature for Data Guard implementers
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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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■CONTENTSxvImprovements in Redo T
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About the Authors■SAM ALAPATI is
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xxii■ACKNOWLEDGMENTSNothing I do
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xxiv■INTRODUCTIONPerformance Mana
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226 CHAPTER 5 ■ DATABASE SECURITY
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266 CHAPTER 6 ■ BACKUP AND RECOVE
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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 317DBA11g1
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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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CHAPTER 7 ■ DATA PUMP 333DBMS_OUT
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CHAPTER 9■ ■ ■Storage Managem
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