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2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
2.Oracle’S High Availability Vision
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2.Oracle’S High Availability Vision

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  • 1. 1
  • 2. Oracle’s High-Availability Vision: What’s New in Oracle Database 11g Release 2 Kadir UYAR Oracle Türkiye Teknoloji Satış Danışmanlığı
  • 3. Oracle High Availability Architecture 1. Scale-Out & Low-Cost – High-volume hardware – All components active 2. Application Oriented – Protect and recover application objects – Enable online application changes 3. Integrated & Simple – Availability integrated into all components – Automated 4. Complete & Open – Handles all planned and unplanned downtime – Pluggable components 3
  • 4. Oracle’s Database HA Server Failures Unplanned Downtime Data Failures System Changes Planned Data Downtime Changes App Changes 4
  • 5. Best-of-Breed Server Protection At Lowest Cost Server Real Application Failures Unplanned Clusters (RAC) Downtime Data Failures System Changes Planned Data Downtime Changes App Changes 5
  • 6. Real Application Clusters HR SALES ERP • Scale workloads across multiple low cost servers • Consolidate into fewer servers and databases • Runs all Oracle database applications • Built-in HA 6
  • 7. New in 11.2 RAC One Node Virtualization Benefits for Oracle Databases • A virtualized single instance database – Omotion - live migration of instances across servers • Move services, then shutdown transactional – Built-in cluster failover for high availability • Better than OS level virtualization – Rolling database patches – Manage fewer Operating Systems • 10 DBs on a node does not mean 10 Operating Systems to manage – Rolling OS upgrades 7
  • 8. Best-of-Breed Data Failure Protection At Lowest Cost Human Server Errors Failures Unplanned Flashback Data Downtime Data Corruptions RMAN Failures Oracle Secure Storage Backup Failures System ASM Changes Site Data Guard Planned Failures Streams Data Downtime Changes App Changes 8
  • 9. Traditional Flashback Technologies Recovery 80 Error Detection & Correction 60 Recovery Time • Flashback revolutionizes error recovery 40 – View ‘good’ data as of a past point-in-time – Simply rewind data changes 20 Flashback – Time to correct error equals time to make error 0 Correction Time = Error Time + f(DB_SIZE) • Low impact, easy – simple commands, no complex procedure • Flashback Query, Table, Transaction, Database, Drop • SQL> flashback database to <timestamp>; • Enhancements in 11.2: New in 11.2 • Flashback database performance & monitoring optimizations • Flashback archive support for schema evolution 9
  • 10. Oracle Backup & Recovery Integrated Disk, Tape & Cloud Backup Oracle Enterprise Manager • Recovery Manager (RMAN) manages Database Backup & Recovery Oracle Secure Backup • Intrinsic knowledge of database file RMAN formats and recovery procedures • Block validation • Online block-level recovery • Unused block compression Tape Drive • Online, multi-streamed backup • Native encryption Fast Recovery Area Cloud Data Files 10
  • 11. New in 11.2 Multiple RMAN Compression Levels More Cost Savings • Backup compression: popular way to save on storage • Multiple RMAN backup compression levels – Choose between compression levels & backup throughput • [BASIC] | HIGH | MEDIUM | LOW 11
  • 12. Oracle Secure Backup Enterprise Tape Backup Management Oracle Enterprise Manager Tape Backup for Oracle Secure Backup Oracle Environment File System Data Oracle Database • Built-in Oracle Integration RMAN Integration • 25 – 40% faster than leading competition • 4X less expensive Tape Virtual than comparable products Library Tape • Supports Oracle Database Library (VTL) 11g through Oracle9i 12
  • 13. Oracle Secure Backup Cloud Module Offsite Database Backups in the Cloud Database Files / Fast Recovery Area RMAN RMAN Oracle Secure Backup Cloud Compression / Module Amazon S3 Encryption • Oracle Secure Backup Cloud module: Backup databases to Amazon Cloud – Complements local disk and/or tape backup – Eliminates IT management overhead of a disaster recovery site 13
  • 14. Automatic Storage Management (ASM) Stores & Manages All Data Database Application 3rd Party FS ASM Disk Group • ASM dynamic volume manager supports file systems • ASM directly supports Clusterware files – Cluster Repository, Voting Disk • Built-in mirroring protects from disk failures • Enables auto-repair from corrupt blocks using a valid mirror copy 14
  • 15. New in 11.2 ASM Cluster File System Oracle Management of File System Data • Manage both database & file system data – E.g.: Oracle & Application binaries, trace files, alert logs, BFILEs, image files, etc. • Clustered or local file system – Data stored in ASM – Inherits all ASM manageability benefits • Online disk add/drop/rebalance • Integrated mirroring • Cross-platform Shared File System • Read-Only Snapshots – Up to 63 point-in-time space efficient copies of file system • Linux and Windows only in first release 15
  • 16. Active-Active Availability Minimizing Downtime During Site Failures Human Server Errors Failures Unplanned Data Downtime Data Corruptions Failures Storage Failures Site Data Guard Failures GoldenGate Streams 16
  • 17. Oracle Data Guard Best Disaster Recovery Open R/O with Dallas Physical Standby Active Data Guard Sync or Async Redo Shipping Production Redo Database Apply Network Backup DIGITAL DATA STORAGE DIGITAL DATA STORAGE Broker Open R/W for Logical peripheral writes Transform Standby Chicago Redo to SQL SQL Apply Boston 17
  • 18. New in 11.1 Active Data Guard Offload Queries to Standby Real-time Queries Concurrent Real-Time Continuous Redo Query Shipment and Apply Primary Physical Database Standby Database • Queries on standby database concurrent with apply • Available with Physical Standby in 11.1 – Handles all data types, very fast, operationally simple • Eliminates cost of DR – All hardware used for production load 18
  • 19. New in 11.2 Oracle Active Data Guard Read Scalability, with DR Queries Scalable Reader • Up to 30 active Farm standby databases Queries • Flexible options to Updates Queries scale read performance • Add more active Queries standby databases • Scale active standby databases using Production Database Oracle RAC 19
  • 20. New in 11.2 Oracle Active Data Guard Auto Block Protection • Automatically repair block corruptions online • Primary repaired from standby and vice-versa Read/Write Real-time Workload Reporting Primary Continuous redo shipping validation & apply Active Standby Database Database 20
  • 21. New in 11.1 Snapshot Standby Test with Production Data Before Deployment Physical Standby • Use Standby Database for testing Apply Logs and development – Eliminates cost of DR – Justify full scale test and DR Open Back out environments by combining into one Database Changes • Preserves zero data loss while in test/dev mode Snapshot Standby – But no real time query or fast failover Perform Testing • Similar to storage snapshots, but: – Provides DR at the same time Continuous Redo Shipping – Single copy of storage 21
  • 22. New in 11.2 Oracle Data Guard Better Application Availability • Automate client failover with role-based services and FAN Auto-start of FAN primary enabled database JDBC and OCI services clients Wide Area Network (ASYNC) Fast notification of application Primary clients Database Standby New Primary Database 22
  • 23. New in 11.2 Oracle Active Data Guard Ensure Service Levels for Query Latency • Automatically enforce service levels for standby queries • Query receives error if data delay exceeds SLA • Applications can redirect query to primary Read/Write Real-time Workload Reporting Primary Continuous redo shipping validation & apply Active Standby Database Database 23
  • 24. New in 11.2 Additional Data Type Support Both Data Guard SQL Apply & Streams • Additional Data Type support: – Basic Table Compression – OLTP Table Compression – SecureFiles • Without deduplication – Online Table Redefinition – Extended data type support for SDO_GEOMETRY (SQL Apply) 24
  • 25. Comprehensive Data Guard Monitoring Using Enterprise Manager 10g Release 5 • Critical Data Guard metrics reported on HA console 25
  • 26. Oracle Streams Built-in Oracle Database Replication Solution Source Target Database Database Propagate Redo Capture Apply1 Logs Apply2 Transparent • Active-active databases with automatic Gateway conflict detection & optional resolution Non-Oracle • Provides HA for custom apps where update Database conflicts can be avoided or managed 26
  • 27. New in 11.2 XStream Fast Real-Time Programmatic Access to Data Changes • Extended Streams - XStream – API for fast real-time access to changes in Oracle database – Client attaches directly to Streams apply process using OCI/Java – Outbound server (XStream Out) • Stream changes out of the Oracle database – Inbound server (XStream In) XStream • Stream changes from external sources into an Oracle database 27
  • 28. New in 11.2 Better Streams Performance • Performance optimizations of uni-directional Streams extended to one-to-many • Faster transformations – Statement DML Handlers • Up to 4x faster than procedural DML handlers – New Declarative Transformation - Keep Columns • Extensive tuning throughout Streams • Improved JMS integration and faster Streams Advanced Queuing – AQ dequeue is 30%-100% faster than previous releases 28
  • 29. GoldenGate • Best-in-class leader in real-time data solutions • Continuous Availability for heterogeneous systems • Real-time data access for Reporting • Real-time data for BI, EPM, Exadata • Zero-downtime migrations / upgrades to Oracle Database and Applications Real-time information • Over 400 customers with 4,000+ implementations across Fortune 500 companies: Financial Services, Communications, Healthcare, Public Sector, Retail & Utilities industries Real-time Access • Top 3 of 5 largest commercial banks • Top 3 of 3 busiest ATM networks • Top 7 of 10 financial data services companies • Top 4 of 5 telecommunications providers • Top 3 of 5 largest food & drug stores 29
  • 30. GoldenGate for Heterogeneous Platforms Databases O/S and Platforms Capture: • Windows 2000, 2003, XP Oracle • Linux DB2 • Sun Solaris Microsoft SQL Server • HP NonStop Sybase ASE • HP-UX Teradata • HP TRU64 Enscribe • HP OpenVMS SQL/MP • IBM AIX SQL/MX • IBM z/OS Delivery - all listed above, plus: HP Neoview, Netezza, Greenplum, and any ODBC compatible databases ETL products JMS message queues MySQL TimesTen 30
  • 31. GoldenGate and Streams Oracle GoldenGate Oracle Streams • GoldenGate is Oracle’s strategic replication solution • Streams continues to be a supported Oracle Database feature • Best Streams technology will be integrated into GoldenGate 31
  • 32. GoldenGate and Data Guard Heterogeneous Oracle Distributed Oracle Active Data Fully-active GoldenGate Guard Subset Replicas Oracle DB Primary Oracle DB Standby • Information Distribution & Consolidation, Application Upgrades & Changes – Use GoldenGate - heterogeneous, active-active, transformations, subsetting • Disaster Recovery / Data Protection / HA – Simple Full Oracle Database Protection • Use Active Data Guard • High-performance, simple, drop-in solution for HA and DR, readable at standby • Works for all apps and data types, including packaged apps that can’t be changed – Application desiring flexible HA, active-active, schema changes, platform changes • Use GoldenGate • Avoid or manage active-active conflicts at application level • Combine the two for full database protection and information distribution 32
  • 33. Best Online Planned Maintenance At Lowest Cost Server Failures Unplanned Downtime Data Failures System Online Reconfiguration Changes Rolling Upgrades Planned Data Online Redefinition Downtime Changes App Edition-based Changes Redefinition 33
  • 34. Online Reconfiguration Scaling on Demand • Servers – Add/Remove RAC nodes online – No data movement needed Database • Storage – Add/Remove ASM disks or arrays online – Automatically rebalance after storage change Storage • Clusterware, ASM – Upgrade Oracle Clusterware and ASM (11g) in an online manner 34
  • 35. Online Patching and Upgrades • Most one-off patches can be applied to a running Oracle instance – Linux-x86, Solaris 10, HP-UX 11i – [New in 11.2] Windows 32-bit and Windows 64-bit, AIX v6.1 [TL2 SP1] • More complex one-off patches can be deployed online using RAC rolling patches (available 10g onwards) • Database release/patchset upgrades, operating system upgrades, platform migrations can be applied in rolling fashion using Data Guard / GoldenGate / Streams • Data Center moves / SAN migration / Technology Refresh etc. can be done with minimal downtime using Data Guard / GoldenGate / Streams 35
  • 36. Online Index & Table Redefinition • All index changes can be done online – 11gR1 – table is never locked during online index creation • Tables can be Reorganized & Redefined online – Allows changing location, table type, partitioning, columns, column types – Contents can be transformed as they are copied Copy Transform Source Table Table Result Table Store Continuous Update Updates Queries & Tracking Transform Updates Updates 36
  • 37. New in 11.2 Edition-based Redefinition Overview • Enables online application patches and upgrades • Allows old and new version of application to co-exist even though schema is changed by new version • Capabilities primarily used by application developers 37
  • 38. New in 11.2 Edition-based Redefinition How Does it Work? Post-upgrade Edition • Maintains logical versions of changed database objects, through: – Edition – Editioning View – Crossedition Trigger Crossedition • PL/SQL code changes and view changes installed Triggers in the privacy of a new edition • New data changes made to new Pre-upgrade Edition columns/tables not seen by old edition • Editioning view exposes a private projection of a table into each edition • Crossedition trigger propagates changes made by old edition into new edition’s columns, or vice-versa 38
  • 39. End-to-End Availability 39
  • 40. Sun Oracle Database Machine • Grid is the architecture of the future • Highest performance, lowest cost, incrementally scalable • Redundant and Fault Tolerant • Sun Oracle Database Machine delivers the first and only complete grid architecture for all data management needs Oracle Database Server Grid • 8 High-performance compute Exadata Storage Server Grid servers • 14 High-performance storage servers InfiniBand Network • 5TB flash storage • 40 Gb/sec fault-tolerant unified • Data is mirrored across storage server and storage network servers © 2009 Oracle Corporation - Confidential 40 40
  • 41. Database Technology Drives Availability Real Active Application Data Guard Clusters ASM WAN Oracle Secure Fast Backup Recovery Area • Real-time remote standby open for • Protection from queries – Server Failures • Human error correction – Storage Failures – Database, table, row, transaction level – Network Failures – Site Failures • Online indexing and table redefinition • Online patching and upgrades 41
  • 42. Database Machine HA Metrics • Backup & Recovery – Backup shows extreme performance and scalability using Exadata – Full Database Backup to tape demonstrated at 7.8 TB/hr Limited by tape performance of 14 tape drives used in test – Incremental backup to tape at 10% change rate: 70TB/hr – Single RMAN backup channel runs full backup to disk at 2.5 TB/hr • Data Guard – Full DR demonstrated with uncompressed loads over 2TB/hour – Compressed tables reduce redo & net traffic enhancing Data Guard • 5 TB/hour load rates with Data Guard into compressed tables – 5 customers have implemented Data Guard on a Database Machine in first year 42
  • 43. Oracle High Availability Architecture 1. Scale-Out & Low-Cost – High-volume hardware – All components active 2. Application Oriented – Protect and recover application objects – Enable online application changes 3. Integrated & Simple – Availability integrated into all components – Automated 4. Complete & Open – Handles all planned and unplanned downtime – Pluggable components 43
  • 44. HA Sessions, Labs, & Demos by Oracle Development Sunday, 11 October – Hilton Hotel Imperial Ballroom B Tuesday, 13 October – Marriott Hotel Golden Gate B1 3:45p Online Application Upgrade 11:30a GoldenGate Zero-Downtime Application Upgrades Monday, 12 October – Marriott Hotel Golden Gate B1 1:00p GoldenGate Deep Dive: Architecture for Real-Time 11:30a Introducing Oracle GoldenGate Products Wednesday, 14 October – Moscone South Monday, 12 October – Moscone South 10:15a Announcing OSB 10.3, Room 300 1:00p Oracle’s HA Vision: What’s New in 11.2, Room 103 11:45a Active Data Guard, Room 103 2:30p Oracle Streams: What's New in 11.2, Room 301 5:00p Exadata Storage & Database Machine, Room 104 4:00p Database 11g: Performance Innovations, Room 103 5:30p Comparing Data Protection Solutions, Room 102 Thursday, 15 October – Moscone South Tuesday, 13 October – Moscone South 9:00a Empowering Availability for Apps, Room 300 11:30a Oracle Streams: Replication Made Easy, Room 308 12:00p Exadata Technical Deep Dive, Room 307 11:30a Backup & Recovery on the Database Machine, Room 307 1:30p Zero-Downtime DB Maintenance, Room 103 11:30a Next-Generation Database Grid Overview, Room 103 1:00p Oracle Data Guard: What’s New in 11.2, Room 104 Demos Moscone West DEMOGrounds 2:30p GoldenGate and Streams - The Future, Room 270 Mon & Tue 10:30a - 6:30p; Wed 9:15a - 5:15p 2:30p Backup & Recovery Best Practices, Room 104 2:30p Single-Instance RAC, Room 300 Maximum Availability Architecture (MAA), W-045 4:00p Enterprise Manager HA Best Practices, Room 303 Oracle Streams: Replication & Advanced Queuing, W-043 Oracle Active Data Guard, W-048 Hands-on Labs Marriott Hotel Golden Gate B2 Oracle Secure Backup, W-044 Monday 11:30a-2:00p Oracle Active Data Guard, Parts I & II Oracle Recovery Manager & Flashback, W-046 Thursday 9:00a-11:30a Oracle Active Data Guard, Parts I & II Oracle GoldenGate, 3709 44
  • 45. Complete List of New HA Features Oracle Database 11g Release 2 Oracle Database 11g Release 1 45
  • 46. Complete List of New HA Features Oracle Database 11g Release 2 Data Guard Data Guard (contd.) RAC • Active Data Guard: • SQL Apply support of OLTP • Server pools • Online block repair Compression, SecureFiles, XA • RAC One Node • Query SLA in RAC, Online Redefinition & • Omotion • Primary with 30 standbys Edition-based Redefinition, • Parallel local & remote SYNC SDO_GEOMETRY (EDS) ASM transport • Use logical standby as Streams source • Cluster File System • Retrieve remaining redo from primary before failover • OCR & Voting Disk in ASM • Improved client failover Streams • Role-based services Flashback • XStream IN & OUT • Broker support for ONS • Statement DML Handlers • Flashback Database: better • Support auto-client failover • Better infrastructure to track performance for direct loads for logical standby for JDBC, changes to table data • Flashback Database: enable OCI, ODP.Net • New Declarative while database is open • No shutdown of RAC instances Transformation: keep_columns • Flashback Database: better in old standby for switchover • Optimized one-to-many monitoring of progress • No shutdown moving from Max propagation • Flashback Transaction: track Availability to Max Protection • AQ: Improved JMS integration foreign key dependency • Comprehensive support for & performance improvements compressed redo transport • Support of OLTP Compression, SecureFiles, Online Redefinition 46
  • 47. Complete List of New HA Features Oracle Database 11g Release 2 Online Patching & Upgrades OSB 10.3 Grid Control 10.2.0.5 • Edition-based Redefinition • Server-less tape duplication • HA Console using Edition, Editioning View for VTL using NDMP tape • MAA Advisor and Crossedition Trigger copy • Minimal downtime ASM • Online Patching for Windows • Better automation for tape migration & RAC conversion & AIX vaulting • Streams dashboard and • Support for IPv6 as well as improved monitoring of Streams RMAN IPv4 configurations. • Multiple compression levels • Supports LTO-4 tape drive • Database Clone from existing encryption database backups • Target-less DUPLICATE • Manages encryption key • Comprehensive OSB • Optimized checks for seamlessly between native or DUPLICATE management LTO-4 encryption • OSB File System • Expanded DUPLICATE • More comprehensive backup / options Backup/Restore and reports restore monitoring • Task based workflow for mining • Enhanced tablespace point-in- • Verification of tape device time recovery using redo and archived logs configurations transportable tablespace and Data Pump • Improved flexibility of SET NEWNAME • Faster transportable database 47
  • 48. Complete List of New HA Features Oracle Database 11g Release 1 Clusters Data Guard - Generic Data Guard SQL Apply • Better performance, failover, Snapshot standby Support XMLType data type management Fast-Start Failover in secs (CLOB) • Seamless integration with XA Fast-Start Failover for Support Transparent Data and Microsoft Transaction asynchronous mode Encryption (TDE) Server Apply performance improved Fast Redo Transport • Optimized Cache Fusion significantly Redo Transport Compression for protocols Support Fine Grained Auditing gaps SYS user no longer required for Support Virtual Private redo shipping Database ASM Standby across Linux/Windows • Temporarily freeze I/O to on x86 Data Guard Redo Apply unresponsive storage and Active Data Guard replay writes when it returns Flashback New parallel media recovery • Rolling Upgrade for ASM doubles redo apply Flashback Transaction instances performance Flashback Data Archive Fast Incremental Backup Better RMAN integration 48
  • 49. Complete List of New HA Features Oracle Database 11g Release 1 Backup & Recovery Upgrades Streams Data Recovery Advisor • Online patching Support XMLType data type Intra-file parallel backup and • Transient logical standby (CLOB) restore Support Transparent Data Faster backup compression Online Redefinition Encryption (TDE) Duplicate database over the • Fast add column with default Apply performance improved network value significantly Integration with Windows • Invisible Indexes prevent Support AWR, ADDM, ASH Volume Shadow Copy premature use of newly created Streams Performance Advisor Services (VSS) API indexes Synchronous capture Integrated protection through • Online index build with NO Table Data Comparison ultra safe mode pause to DML JMS/AQ performance • No recompilation of dependent improvements objects • Easier to execute table DDL operations online 49
  • 50. Oracle GoldenGate Key Features in v10 • General – Across the Platforms – Event Marker Infrastructure – Start Delivery as of CSN (Commit Sequence Number) for efficient instantiation – Enhanced Memory Management – Deferred Apply – Array Fetching to increase initial load performance • Oracle – Additional data type support – Spatial, IOTs, Sequences, clustered table, object table – Support of Append hints (Apply only) – Increased Oracle DDL text maximum size to 2MB – Filtering by User for more efficient loop detection and capture task type separation (e.g. batch vs OLTP) – Expanded Support of ALO (Archive Log Only) mode for RAC environments • SQL Server – SQL Server 2008 Delivery – Capture of tables without primary keys (SQL Server 2005) • DB2 LUW – Support for Multi Dimensional Clustered Tables (MDC) – Support for Materialized Query Tables (MQT) • NSK – Support of HP Blades – Support Primary Key Updates from Open Systems (e.g. Oracle to NSK) • Teradata – Integration of Oracle GoldenGate Director with TMSM (Teradata Multi-System Manager) – Support of Teradata v13 – DDL replication – Support for additional platforms: Solaris 10, SUSE 9/10 – Full Unicode Support for Linux ODBC 50
  • 51. Resources • Oracle.com: http://www.oracle.com/ha • Oracle HA Customer Success Stories on OTN: http://www.oracle.com/technology/deploy/availability/htdocs/HA_CaseStudies.html • Maximum Availability Architecture (MAA): http://otn.oracle.com/goto/maa • MAA Assessment: http://www.oracle.com/goto/hasurvey 51
  • 52. QUESTIONS ANSWERS 52
  • 53. For More Information search.oracle.com or oracle.com 53
  • 54. 54
  • 55. 2. ŞĐFRE DÜNYADA 55

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