Implementing Oracle9i Data Guard Michael New Senior 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 ModeData loss Divergence Maximum Protection Maximum Availability Maximum Performance Protection ModeData loss Divergence Maximum Protection Maximum Availability Maximum Performance None Some None Yes Minimal

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 …  Disable ARCHIVE_LAG_TARGET  Unset DB_CREATE_ONLINE_LOG_DEST_n  Tune CONTROL_FILE_RECORD_KEEP_TIME   FORCE LOGGING  Identical sites  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, , ext.  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 – – Data Guard Overview: w.html

Next Steps  Relevant web sites to visit for more information – Data Guard Technical White Paper on OTN: – Data Guard Technology Overview Presentation on OTN: nologyOverview.pdf nologyOverview.pdf – Data Guard Primary Site & Network Configuration Best Practices: estPrac.pdf estPrac.pdf

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A Q & Q U E S T I O N S A N S W E R S

Implementing Oracle9i Data Guard Michael New Senior 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)

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