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Oracle Database High Availability Brandon Kuschel Jian Liu Source: Oracle Database 11g Release 2 High Availability An Oracle White Paper November 2010 http://www.oracle.com/technetwork/database/features/availability/ twp-databaseha-11gr2-1-132255.pdf Overview Human Error Protection • Oracle Flashback Technologies • Oracle Recovery Manager Data Corruption Protection • Fast Recovery Area • Oracle Secure Backup • Data Recovery Advisor Storage Failure Protection • Automatic Storage Management Site Protection • Oracle Data Guard • Oracle GoldenGate Oracle Database's HA Solution Set Human Error Protection • Example: Bug in SQL statement • Isolation: Preventing errors via access control • Faster recovery with Flashback technologies • Undo: Query • Undo: Versions Query: SELECT * FROM emp VERSIONS BETWEEN TIMESTAMP time1 AND time2 WHERE… • Transaction Query: SELECT * FROM FLASHBACK_TRANSACTION_QUERY WHERE XID = transactionID • Undo Transaction - Atomicity • Full Table • Undo Drop • Entire Database Data Corruption Protection • Ex: Fault during single read/write operation • Two-Phase Commit • Prepare: Write to log and lock table • Commit: Write to disk if ready then log as committed • Prevent corruption by setting parameters • Wide range of backup options • RMAN (Oracle Recovery Manager) • Configure backup and recovery policy • Verify backups aren't corrupt • Fast recovery backup • Stored on disk onsite - secondary storage • Only the newest files are stored here • Tertiary (remote) backup • Backups are copied to tape or uploaded to Amazon S3 • Data Recovery Advisor • Identifies the available recovery options Storage Failure Protection Ex: Disk drive crash ASM (Automatic Storage Management) • Database-specific RAID • Block Repair • Automatically: relocate valid blocks from the mirrored copy • Manually: relocate specific blocks • Rolling Upgrades • Keeping application online while upgrading ASM • ACFS and ADVM • ASM Cluster File System • • Extends ASM functionality to support all non-Oracle database files ASM Dynamic Volume Manager • Provides a general purpose volume management platform for 3rd party file system Site Protection • Ex: fire, storm, power outage • Oracle Data Guard options: • Standby database up-to-date • Standby database is a snapshot • Use standby to perform planned maintenance in a rolling fashion Standby database options • Oracle GoldenGate – Distributed databases • All databases are active for reading/writing • Oracle Streams Structure of distributed database References Oracle Database 11g Release 2 High Availability: http://www.oracle.com/technetwork/database/features/availability/twp-databaseha-11gr2-1-132255.pdf Using Oracle Flashback Transaction Query http://docs.oracle.com/cd/B28359_01/appdev.111/b28424/adfns_flashback.htm#ADFNS01005 Oracle Recovery Manager http://www.oracle.com/technetwork/database/features/availability/rman-overview-096633.html Oracle Secure Backup http://www.oracle.com/technetwork/products/secure-backup/overview/index.html ASM in Oracle Database 10g http://www.oracle-base.com/articles/10g/automatic-storage-management-10g.php Oracle Data Guard 11g http://www.oracle.com/technetwork/database/features/availability/twp-dataguard-11gr2-1-131981.pdf Oracle GoldenGate 11g http://www.oracle.com/us/products/middleware/data-integration/goldengate11g-ds-168062.pdf?ssSourceSiteId=otnen Two-Phase Commit Mechanism http://docs.oracle.com/cd/B28359_01/server.111/b28310/ds_txns003.htm
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