ORACLE DATABASE HIGH AVAILABILITY ORACLE 11 GR 2

ORACLE DATABASE HIGH AVAILABILITY & ORACLE 11 GR 2 DATA GUARD 1 Güneş EROL

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

OVERVIEW OF HIGH AVAILABILITY § What is Availability ? Availability is the degree to which an application, service, or functionality is available upon user demand. 3

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 Ø Ø Direct cost: lost productivity, lost revenue. Indirect cost: damaged customer relationships, bad publicity, and lawsuits. 4

MAIN ATTRIBUTES OFAVAILABILITY: Attribute Why Important 1. Redundancy with isolation No single point of failure, failures stay put 2. Zero data loss Complete protection, no recovery concerns 3. Extreme performance Deploy for any application 4. Automatic failover Fast, predictable 5. Full systems utilization Fast recovery, high return on investment 6. Management simplicity Reliable, reduced administrative costs 5

OVERVIEW OF HIGH AVAILABILITY § Causes Of Downtime Unplanned: Ø Ø Ø § Computer failure Storage failure Human error Data corruption Site failure Planned: Ø Ø System changes Data changes 6

ORACLE MAXIMUM AVAILABILITY ARCHITECTURE (MAA) 7

ORACLE MAXIMUM AVAILABILITY ARCHITECTURE (MAA) Oracle Database 11 g with Data Guard * Oracle Database 11 g with RAC ** Oracle Database 11 g with RAC and Data Guard – MAA *** 8

ORACLE DATABASE 11 G 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 9

ORACLE DATABASE 11 G WITH DATA GUARD 10

ORACLE DATABASE 11 G WITH DATA GUARD • Physical standby database provide these advantages: Ø Ø Ø 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 11

ORACLE DATABASE 11 G WITH DATA GUARD • Logical standby database provide these advantages: Ø Ø 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) 12

DATA GUARD PROTECTION MODES 13

ORACLE DATABASE 11 G WITH DATA GUARD SYNC&ASYNC 14

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

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

ORACLE DATABASE 11 G FEATURES 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 converted back to a physical standby database. 17

ORACLE DATABASE 11 G FEATURES A logical standby database has the additional flexibility of being open read-write. While data maintained by SQL Apply cannot be modified, you can 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 18

ORACLE DATABASE 11 G 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 19

ORACLE DATABASE 11 G WITH RAC § Oracle Database 11 g with RAC architecture uses Real Application Clusters and is an inherently high availability system 20

ORACLE DATABASE 11 G WITH RAC AND DATA GUARD – MAA • • RAC and Data Guard provide the basis of Oracle Database 11 g – 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. 21

ORACLE DATABASE 11 G WITH RAC AND DATA GUARD – MAA 22

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) 23

DETERMINING YOUR HIGH AVAILABILITY REQUIREMENTS • Planning and Implementing a Highly Available Enterprise 24

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

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

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