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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 - PowerPoint PPT Presentation
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Implementing Oracle9i Data Guard
Michael NewSenior Technical Consultant
ThinkSpark
Session id: 36226
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
Maximum Availability
Maximum Performance
None
Some
None
None
YesMinimal
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 LOGGINGIdentical sitesinit.oraOracle NetSRLsMonitoring
FORCE LOGGING Mode New feature to Release 9.2 Prevents unlogged direct writes from
propagating to standby Overrides NOLOGGING transactions
FORCE LOGGINGIdentical sitesinit.oraOracle NetSRLsMonitoring
Identical Sites
Logical structures – partition names, directories/files, privileges, accounts, etc.
Network configurations– Oracle– O/S
Hardware environments
FORCE LOGGINGIdentical sitesinit.oraOracle NetSRLsMonitoring
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 … Disable ARCHIVE_LAG_TARGET Unset DB_CREATE_ONLINE_LOG_DEST_n Tune CONTROL_FILE_RECORD_KEEP_TIME
FORCE LOGGINGIdentical sitesinit.oraOracle NetSRLsMonitoring
Initialization Parameters
LOG_ARCHIVE_DEST_2 attributes– OPTIONAL– LGWR– ASYNC– NOAFFIRM– REOPEN– MAX_FAILURE– DELAY– NET_TIMEOUT
FORCE LOGGINGIdentical sitesinit.oraOracle NetSRLsMonitoring
Oracle Network…
Static SID registration Connect-time failover Alternate standby location Session Data Unit (SDU) setting
FORCE LOGGINGIdentical sitesinit.oraOracle NetSRLsMonitoring
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 LOGGINGIdentical sitesinit.oraOracle NetSRLsMonitoring
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 LOGGINGIdentical sitesinit.oraOracle NetSRLsMonitoring
Monitoring OEM Data Guard Diag Pack events Alert log ORA- errors Alert log non ORA- errors V$ views - scripts (White Paper, Appendix 3)
FORCE LOGGINGIdentical sitesinit.oraOracle NetSRLsMonitoring
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_overview.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/DataGuardTechnologyOverview.pdf
– Data Guard Primary Site & Network Configuration Best Practices: http://otn.oracle.com/deploy/availability/pdf/MAA_DG_NetBestPrac.pdf
Reminder – please complete the OracleWorld online session survey
Thank you.
AQ&Q U E S T I O N SQ U E S T I O N SA N S W E R SA N S W E R S
Implementing Oracle9i Data Guard
Michael NewSenior Technical Consultant
ThinkSpark
Session id: 36226
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/.