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5 Configuring the Persistency Service

When examining the configuration of the Persistency Service, it is generally a good idea to consult the documentation relating to the underlying database management system. All explanations in this chapter relate to the database management system INFORMIX on the UNIX platform. The environment can be different for other database management systems or on other operating systems.

5.1 Setting up the database

The database is set up in several stages. First of all the system software of the database management system used must be installed as prescribed by the manufacturer [19]. In addition, IDs must be created for the administration of the database system. In this context, it is also important to consider the definition of roles (IDs) in the area of administration and security. Both the database server environment, for example INFORMIX Dynamic Server 2000, and that of the development environment, for example ESQL (in the client SDK), must be installed.

In the next phase, the resources assigned to the database system must be configured. This particularly includes system resources such as

–the number of needed semaphores,

–size and number of shared memory segments,

–configuration of disk memory (raw devices, RAID controller), and the

–definition of connections (connectivity) to the database server.

When using the INFORMIX database system, for example, the entries in the files /etc/hosts and /etc/services must match those in the sqlhosts file. In general, these global activities must be performed under the root administrator ID.

The next step is for the database administrator to structure the assigned disk resources (dividing into chunks), applying a structure (dbspaces, blobspaces) which can be used in the definition of the database schema and in the backup and recovery concept. The aim of this activity is to achieve an optimum solution under the aspects of fault tolerance, perfor- mance and availability. These activities are supported by appropriate tools, which are sup- plied with the database system. For example, here INFORMIX offers the onmode tool.

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Siemens V 4.0 manual Configuring the Persistency Service, Setting up the database
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