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Session id: 36226 Implementing Oracle9i Data Guard Michael New Senior Technical Consultant ThinkSpark Data Guard - Outline Concepts Architecture Best practices Implementation Concepts Differentiate High Availability approaches Enhanced protection modes – – – Maximum Protection Maximum Availability Maximum Performance Standby Redo Logs (SRLs) Automatic gap resolution Data Guard broker – – Data Guard Manager (OEM) Command-line interface (CLI) Concepts Protection Mode Data loss Divergence Maximum Protection None None Maximum Availability None Some Minimal Yes Maximum Performance Architecture Source: Oracle9i Data Guard Concepts and Administration Architecture Log Transport (LGWR, ARC, FAL, RFS) – – Archive log permissions, destinations, transmission, reception & transmission failure resolution LGWR or ARC can write from primary to standby Log Apply (MRP or LSP) – – Managed recovery (not read-only) mode SQL apply mode Role Management – – Primary or Standby Switchovers, graceful or forced failovers Data Guard Broker (DMON) Best Practices FORCE LOGGING mode Identical sites Initialization parameters Oracle network Standby redo logs (SRLs) Monitoring FORCE LOGGING Identical sites init.ora Oracle Net SRLs Monitoring FORCE LOGGING Mode New feature to Release 9.2 Prevents unlogged direct writes from propagating to standby Overrides NOLOGGING transactions FORCE LOGGING Identical sites init.ora Oracle Net SRLs Monitoring Identical Sites Logical structures – partition names, directories/files, privileges, accounts, etc. Network configurations – – Oracle O/S Hardware environments FORCE LOGGING Identical sites init.ora Oracle Net SRLs Monitoring Initialization Parameters…. Use SPFILE Initialization settings (except 4) No environment variables STANDBY_ARCHIVE_DEST=LOG_ARCHIVE_DEST1 LOG_ARCHIVE_DEST_3 = … ALTERNATE … LOG_ARCHIVE_DEST_1 = … ARCH … FORCE LOGGING Disable ARCHIVE_LAG_TARGET Identical sites Unset DB_CREATE_ONLINE_LOG_DEST_n Tune CONTROL_FILE_RECORD_KEEP_TIME init.ora Oracle Net SRLs Monitoring Initialization Parameters LOG_ARCHIVE_DEST_2 attributes – OPTIONAL – LGWR – ASYNC – NOAFFIRM – REOPEN – MAX_FAILURE – DELAY – NET_TIMEOUT FORCE LOGGING Identical sites init.ora Oracle Net SRLs Monitoring Oracle Network… Static SID registration Connect-time failover Alternate standby location Session Data Unit (SDU) setting FORCE LOGGING Identical sites init.ora Oracle Net SRLs Monitoring Oracle Network Same network file structure Listeners – – Database clients – stop stby lsnr Redo log & DBA traffic tnsnames.ora files – – – Local node database clients DBAs FORCE LOGGING Identical sites init.ora Oracle Net SRLs Monitoring Standby Redo Logs SRLs on all sites Same # SRLs on all sites Same SRL names on all sites Redo logs & SRLs the same size # SRL groups = 1 + (# redo log groups) SRL groups < MAXLOGFILES SRL members < MAXLOGMEMBERS FORCE LOGGING Identical sites init.ora Oracle Net SRLs Monitoring Monitoring OEM Data Guard Diag Pack events Alert log ORA- errors Alert log non ORA- errors V$ views - scripts (White Paper, Appendix 3) FORCE LOGGING Identical sites init.ora Oracle Net SRLs Monitoring Implementation…. FORCE LOGGING Identical sites – O/S clocks – /etc/hosts – Environment variables & DBA scripts Initialization parameters (SPFILE) Oracle network configuration files ARCHIVELOG mode & automatic archiving Backup primary database Create standby control file Implementation Copy backup to standby site Recover standby database – Mount standby database – Create SRLs – Start new listeners Recover standby Place standby in managed recovery mode Enable LOG_ARCHIVE_DEST_STATE_2 on primary Set protection mode on primary Verify standby works – – – – – Enable Data Guard broker Next Steps…. Michael New, [email protected], 800-846-4082, ext. 104 Recommended sessions – – Oracle Data Guard: Maximum Data Protection at Minimum Cost Data Guard SQL Apply: Back to the Future Recommended demos and/or hands-on labs – Using Data Guard Manager to Manage a Standby Database Next Steps…. See Your Business in Our Software – Visit the DEMOgrounds for a customized architectural review, see a customized demo with Solutions Factory, or receive a personalized proposal. Visit the DEMOgrounds for more information. Relevant web sites to visit for more information – – Oracle High Availability Guidelines & Recommendations: M. Burke, 2003, ThinkSpark – [email protected] Data Guard Overview: http://otn.oracle.com/deploy/availability/htdocs/odg_overvie w.html Next Steps Relevant web sites to visit for more information – – – Data Guard Technical White Paper on OTN: http://otn.oracle.com/deploy/availability/pdf/DG92_TWP.pdf Data Guard Technology Overview Presentation on OTN: http://otn.oracle.com/deploy/availability/pdf/DataGuardTech nologyOverview.pdf Data Guard Primary Site & Network Configuration Best Practices: http://otn.oracle.com/deploy/availability/pdf/MAA_DG_NetB estPrac.pdf Reminder – please complete the OracleWorld online session survey Thank you. QUESTIONS ANSWERS Session id: 36226 Implementing Oracle9i Data Guard Michael New Senior Technical Consultant ThinkSpark Implement B&R – DG is HA (not B&R) Solution B&R addresses database integrity & recovery DG is HA solution to reduce MTTR, premised on reliable B&R solution Without B&R, data loss possible with DG because of – – – – – Primary / secondary loss of network communication Standby maintenance downtime Hardware failure due to multiple devices Hardware failure during role reversal logical corruption (if propagated to the standby) ThinkSparkThinkSpark For more than 15 years, ThinkSpark has been a world-class technology partner to those businesses that have invested in Oracle technologies and solutions. ThinkSpark has delivered unmatched Oracle database expertise, Oracle systems integration skills, Oracle education services and Oracle license management insights to thousands of businesses across the country and around the globe. Headquartered in Dallas, ThinkSpark's more than 100 professionals serve clients across all industries through facilities in Austin, Dallas, Houston, Las Vegas, Oklahoma City and San Antonio. For more information about ThinkSpark, call (888) 262-6043 from the U.S., Canada and Mexico or visit ThinkSpark on the World Wide Web at http://www.thinkspark.com/.
