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Before getting started, let's first define the meaning of the term HA. HA indicates that data is provided when dependent applications require data. The purpose is to eliminate or avoid downtime as much as possible.

Before getting started, let's first define the meaning of the term DB2 9.5 high availability (HA. HA indicates that data is provided when dependent applications require data. The purpose is to eliminate or avoid downtime as much as possible. One term related to HA is Disaster Recovery (DR). The difference between DR and HA is that it focuses on protecting data and preventing data loss due to catastrophic faults. This article only focuses on HA.

Terms and Client/Server database architecture

Terms and Client/Server database architecture

We will first discuss some terms and concepts, which are important for understanding the high availability of DB2 9.5.

A database solution consists of three parts of software:

User Application

Client Software

Database Engine

In addition to software, to get an effective solution, you must have other resources:

Server hardware

Network Connection

Disk Storage

Operating System

All these aspects must be taken into account when designing an HA solution. An HA solution may not be created only when the database engine is highly available. The design of an HA solution is not entirely a technical problem. It must also consider other factors, such as the cost, skill requirements, and management requirements of the solution.

Database applications are based on clients/servers. Whether an application can produce consistent results depends on the integrity of the database software. Although this is obvious, it is important to select and design a solution.

The above content is an introduction to the DB2 9.5 high availability solution. I hope you will get something better.