ORACLE DATABASE HIGH AVAILABILITY & ORACLE 11GR2 DATA GUARD

1. ORACLE DATABASE HIGH AVAILABILITY&ORACLE 11GR2 DATA GUARD Güneş EROL

2. OUTLINE • Overview Of High Availability • Oracle Database High Availability Architecture • Determining Your High Availability Requirements

3. Overview Of High Availability • What is Availability ? • Availability is the degree to which an application, service, or functionality is available upon user demand.

4. Overview Of High Availability • Importance Of High Availability • Support enterprises to gain their competitive advantages by providing capability of continuously accessing to critical business data. • Much downtime (surpass the threshold) can cause • Direct cost: lost productivity, lost revenue. • Indirect cost: damaged customer relationships, bad publicity, and lawsuits.

5. Main Attributes of Availability:

6. Overview Of High Availability • Causes Of Downtime • Unplanned: • Computer failure • Storage failure • Human error • Data corruption • Site failure • Planned: • System changes • Data changes

7. Oracle MaximumAvailability Architecture (MAA)

8. Oracle MaximumAvailability Architecture (MAA) • Oracle Database 11g with Data Guard * • Oracle Database 11g with RAC ** • Oracle Database 11g with RAC and Data Guard – MAA ***

9. Oracle Database 11g with Data Guard • Data Guard provides a comprehensive set of services that create, maintain, manage, and monitor one or more standby databases to enable Oracle databases to survive disasters, failures, errors and data corruption. • Two types of standby databases: • Physical standby database • Logical standby database • Three type of Data Guard Protection Modes: • Maximum Protection • Maximum Avaliablity • Maximum Performance

10. Oracle Database 11g with Data Guard

11. Oracle Database 11g with Data Guard • Physical standby database provide these advantages: • Protection from user errors and logical corruption • Protection from disasters and site failures if located remotely • Standby database can diverge for reporting or testing purposes and resynchronize with its primary database once complete • Backups can be taken from the physical standby database instead of the production database, relieving the load on the production database • Enable rolling database upgrades of the production database

12. Oracle Database 11g with Data Guard • Logical standby database provide these advantages: • Logical Standby Database is an open, independent, active database • A logical standby database can be used for other business purposes in addition to disaster recovery. • Users can access a logical standby database for queries and reporting purposes. • Not all Data Types supported(e.g., BFILE, Collections (including VARRAYS and nested tables), Encrypted columns)

13. Data Guard protection modes

14. Oracle Database 11g with Data Guard SYNC&ASYNC

15. Oracle Database 11gFeatures • The Active Data Guard option, first available with Oracle Database 11g, • Snapshot Standby • A logical standby database has the additional flexibility of being open read-write • Heterogenous Platform Support

16. Oracle Database 11gFeatures • The Active Data Guard option, first available with Oracle Database 11g, enables a physical standby database to be open read-only while redo transport and standby apply are both active..

17. Oracle Database 11gFeatures • Snapshot Standby enables a physical standby database to be open read-write for any activity that requires a read-write replica of production data (e.g., testing). • A Snapshot Standby continues to receive, but not apply, redo generated by the primary. Redo is applied automatically when the Snapshot Standby is convertedback to a physical standby database.

18. Oracle Database 11gFeatures • A logical standby database has the additional flexibility of being open read-write. While data maintained by SQL Apply cannot be modified, you can add additional local tables, create local index structures to optimize reporting, use the standby database as a data warehouse, or use it to transform information used to load data marts

19. Oracle Database 11g with RAC • This architecture provides the following benefits: • Fast node (measured in minutes) and instance failover (measured in seconds) • Rolling patch upgrades • Multiple active instance availability and scalability across multiple nodes

20. Oracle Database 11g with RAC • Oracle Database 11g with RAC architecture uses Real Application Clusters and is an inherently high availability system

21. Oracle Database 11g with RAC and Data Guard – MAA • RAC and Data Guard provide the basis of Oracle Database 11g – Maximum Availability Architecture (MAA). • Symmetric sites also enable processes and procedures to be kept the same between sites, making operational tasks easier to maintain and execute.

22. Oracle Database 11g with RAC and Data Guard – MAA

23. Determining Your High Availability Requirements • Analysis Framework for Determining High Availability Requirements • Business Impact Analysis • Cost of Downtime • Recovery Time Objective (RPO) • Recovery Point Objective (RTO)

24. Determining Your High Availability Requirements • Planning and Implementing a Highly Available Enterprise

25. + 117% Read-write service + 70% Read-only service PERFORMANCE AND SCALABILITY • More scalable • Better performance: • Eliminate contention betweenread-write and read-only workload • Simplify performance tuning 2,610 1,530 Transactions / sec 630 290 Read-onlyoffloaded to standby All services run on primary database

26. PERFORMANCE AND SCALABILITY +250% transactions per second on Primary +110% performance per second on Read process