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Object documentation Database Parameters Locate the document in the library structure

Definition

Database parameters define fundamental properties of the database instance.

The following types of database parameters exist:

·        General Database Parameters

·        Special Database Parameters

·        Support Database Parameters

·        liveCache Database Parameters (for SAP liveCache database instances only)

Database parameters have a range of properties (see Properties of Database Parameters).

Default Parameter File

The default parameter file cserv.pcf (see Configuration Files) contains the default values, value ranges, calculation formulas and properties of the database parameters. The default parameter file and a database parameter file (initially filled with the default values) are installed with the database instance. When a user changes a database parameter, the database system saves the new value for the database parameter in the database parameter file.

Use

When creating a new database instance, you can use the system default for the database parameters, use the database parameters from a different database instance, or else import database parameters from a complete data backup. You can change the values of most database parameters later.

Caution

Changes to database parameters do not take effect until the database instance is restarted.

With the Database Manager CLI, you can change some database parameters even while the system is running.

The database system saves the values of the database parameters in binary format in the database parameter file of the database instance. To display or change the database parameters, use the Database Manager or, in SAP systems, the CCMS:

·        Database Manager GUI, Displaying and Changing Database Parameters

·        Database Manager CLI, Configuring Database Instances

·        Database Administration in CCMS: MaxDB, Structure linkParameters

·        Database Administration in CCMS: SAP liveCache Technology, Structure linkParameters

You can also use these tools to display the history of the values of the database parameters.

See also:

Creating and Configuring a Database Instance

 

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