Oracle database high availability Overview Of High Availability (Importance Of High Availability, Causes Of Downtime), Oracle Database High Availability Architecture (Oracle Database 10g, Oracle Database 10g with RAC,.), Determining Your High Availability Requirements. | ORACLE DATABASE HIGH AVAILABILITY OUTLINE Overview Of High Availability Oracle Database High Availability Architecture Determining Your High Availability Requirements OVERVIEW OF HIGH AVAILABILITY What is Availability ? Availability is the degree to which an application, service, or functionality is available upon user demand. Main characteristics of Availability: Reliability: system must have less errors in both hardware and software – including database, web servers, and application. OVERVIEW OF HIGH AVAILABILITY Recoverability: there may have many choices in recovering from a failure. Hence, the most appropriate action is also to satisfy business requirements most Timely error detection: although a system can be recovered from an outage in time manner, time to monitor corrupt components can be costly and cause your SLA (service level agreement) not met. Continuous operation: maintenance activities should be allowed to perform continuous data access with little or no . | ORACLE DATABASE HIGH AVAILABILITY OUTLINE Overview Of High Availability Oracle Database High Availability Architecture Determining Your High Availability Requirements OVERVIEW OF HIGH AVAILABILITY What is Availability ? Availability is the degree to which an application, service, or functionality is available upon user demand. Main characteristics of Availability: Reliability: system must have less errors in both hardware and software – including database, web servers, and application. OVERVIEW OF HIGH AVAILABILITY Recoverability: there may have many choices in recovering from a failure. Hence, the most appropriate action is also to satisfy business requirements most Timely error detection: although a system can be recovered from an outage in time manner, time to monitor corrupt components can be costly and cause your SLA (service level agreement) not met. Continuous operation: maintenance activities should be allowed to perform continuous data access with little or no downtime and transparent to end users. 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. OVERVIEW OF HIGH AVAILABILITY Causes Of Downtime Unplanned: Computer failure Storage failure Human error Data corruption Site failure Planned: System changes Data changes OVERVIEW OF HIGH AVAILABILITY Causes Of Downtime Unplanned: Computer failure A computer failure outage occurs when the system running the database becomes unavailable because it has shut down or is no longer accessible. Example: Database system hardware failure Operating system failure Oracle instance failure Network interface failure OVERVIEW OF HIGH AVAILABILITY Causes Of Downtime Unplanned: Storage .
