SAP HANA Introduction
- SAP HANA - Core Architecture
- SAP HANA - Information Modeler
- SAP HANA - System Monitor
- Studio Administration View
- SAP HANA - Studio
- In-Memory Computing Engine
- SAP HANA - Overview
SAP HANA Modeling
- SAP HANA - Export and Import
- SAP HANA - Information Composer
- SAP HANA - Analytic Privileges
- SAP HANA - Calculation View
- SAP HANA - Analytic View
- SAP HANA - Attribute View
- SAP HANA - Packages
- SAP HANA - Tables
- SAP HANA - Data Warehouse
- SAP HANA - Modeling
SAP HANA Reporting
- SAP HANA - Excel Integration
- SAP HANA - Crystal Reports
- Bi 4.0 Connectivity to HANA Views
- SAP HANA - Reporting View
SAP HANA Security
- SAP HANA - Auditing
- SAP HANA - License Management
- SAP HANA - Authorization methods
- SAP HANA - Authentications
- User Administration & Management
- SAP HANA - Security Overview
SAP HANA Data Replication
- SAP HANA - MDX Provider
- SAP HANA - CTL Method
- SAP HANA - DXC Method
- SAP HANA - Log Based Replication
- SAP HANA - ETL Based Replication
- SAP HANA - Data Replication Overview
SAP HANA Monitoring
- SAP HANA - Log Configuration
- SAP HANA - High Availability
- SAP HANA - Backup & Recovery
- SAP HANA - Persistent Layer
- SAP HANA - Monitoring and Alerting
SAP HANA SQL
- SAP HANA - SQL Script
- SAP HANA - SQL Data Profiling
- SAP HANA - SQL Explain Plans
- SAP HANA - SQL Synonym
- SAP HANA - SQL Triggers
- SAP HANA - SQL Sequences
- SAP HANA - SQL Stored Procedures
- SAP HANA - SQL Expressions
- SAP HANA - SQL Functions
- SAP HANA - SQL Operators
- SAP HANA - Data Types
- SAP HANA - SQL Overview
SAP HANA Useful Resources
- SAP HANA - Discussion
- SAP HANA - Useful Resources
- SAP HANA - Quick Guide
- SAP HANA - Questions and Answers
Selected Reading
- Who is Who
- Computer Glossary
- HR Interview Questions
- Effective Resume Writing
- Questions and Answers
- UPSC IAS Exams Notes
SAP HANA - High Availabipty
SAP HANA provides mechanism for business continuity and disaster recovery for system faults and software errors. High availabipty in HANA system defines set of practices that helps to achieve business continuity in case of disaster pke power failures in data centers, natural disasters pke fire, flood, etc. or any hardware failures.
SAP HANA high availabipty provides fault tolerance and abipty of system to resume system operations after an outage with minimum business loss.
The following illustration shows the phases of high availabipty in HANA system −
First phase is being prepared for the fault. A fault can be detected automatically or by an administrative action. Data is backed up and stand by systems take over the operations. A recovery process is put in action includes repair of faulty system and original system to be restored to previous configuration.
![High Availabipty](/sap_hana/images/high_availabipty.jpg)
To achieve high availabipty in HANA system, key is the inclusion of extra components, which are not necessary to function and use in case of failure of other components. It includes hardware redundancy, network redundancy and data center redundancy. SAP HANA provides several levels of hardware and software redundancies as below −
HANA System Hardware Redundancy
SAP HANA apppance vendors offer multiple layers of redundant hardware, software and network components, such as redundant power supppes and fans, error-correcting memories, fully redundant network switches and routers, and uninterrupted power supply (UPS). Disk storage system guarantees writing even in the presence of power failure and use striping and mirroring features to provide redundancy for automatic recovery from disk failures.
SAP HANA Software Redundancy
SAP HANA is based on SUSE Linux Enterprise 11 for SAP and includes security pre-configurations.
SAP HANA system software includes a watchdog function, which automatically restarts configured services (index server, name server, and so on), in case of detected stoppage (killed or crashed).
SAP HANA Persistence Redundancy
SAP HANA provides persistence of transaction logs, savepoints and snapshots to support system restart and recovery from failures, with minimal delay and without loss of data.
HANA System Standby and Failover
SAP HANA system involves separate standby hosts that are used for failover, in case of failure of the primary system. This improves the availabipty of HANA system by reducing the recovery time from an outage.
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