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Function documentation General Database Parameters Locate the document in its SAP Library structure

Use

The following overview describes the general database parameters. For more information about other database parameters, see Special Database Parameters, Support Database Parameters and Structure linkliveCache Parameters.

Caution

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

General database parameters

Parameter

Description

CACHE_SIZE

Size of the I/O Buffer Cache (in pages)

INSTANCE_TYPE

Database instance type; defined when the database instance is created and cannot be changed later.

KERNELVERSION

Version of the database software; this parameter is changed implicitly if a new version of the database software is installed.

LOG_MIRRORED

Specifies whether the log area is mirrored (Log Mode). The parameter is relevant only for creating a mirror volume using Database Manager CLI. When a mirror volume is created using the Database Manager GUI, this value is changed implicitly.

LOG_SEGMENT_SIZE

Size of a log segment (in pages). If a log segment is full, a lock backup is started automatically, if this option is activated.

MAXBACKUPDEVS

Maximum number of files or tape devices in a group of parallel backup media

MAXCPU

Maximum number of processors to which the database system can distribute user tasks. Note that your computer’s operating system resources have to be available for other processes, not only for the database system.

MAXDATAVOLUMES

Maximum number of data volumes

MAXLOCKS

Maximum number of entries in the lock list

MAXLOGVOLUMES

Maximum number of log volumes

MAXUSERTASKS

Maximum number of user tasks that are active at the same time and therefore the maximum number of database sessions. If this number is reached, then no additional users can log onto this database instance. We recommend that you monitor MAXUSERTASKS. Overconfiguration leads to increased address space requirement (particularly when using shared memory).

MCOD

MCOD = Multiple Components One Database; indicates whether the database is being used by more than one application (for SAP systems).

RESTART_SHUTDOWN

Specifies whether the database instance automatically transferred to the ONLINE operational state when the operating system is started, and if it should be stopped automatically when the operating system is shut down.

RUNDIRECTORY

Run directory on the database instance

 

 

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