Entering content frame

Function documentation liveCache Database Parameters Locate the document in the library structure

Use

Note

The database system uses liveCache database parameters only for SAP liveCache database instances.

For more information about other database parameters, see General Database Parameters, Special Database Parameters and Support Database Parameters.

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.

Prerequisites

You use a SAP liveCache database instance.

Features

Note

SAP customers can find a detailed description of the liveCache database parameters in SAP note 833216.

liveCache Database Parameters

Parameter

Meaning

How can I change this Parameter?

MIN_RETENTION_TIME

MAX_RETENTION_TIME

Defines (in minutes) when the garbage collectors start deleting the history data (undo log entries and links to them)

The garbage collectors start deleting the history data in the following cases:

·        When the data area is more than 90% full, the garbage collectors delete all history data that is older than MIN_RETENTION_TIME.

·        When the data area is less than 90% full, the garbage collectors delete all history data that is older than MAX_RETENTION_TIME.

See History Management.

Parameter can be changed with the Database Manager CLI while in operation

OMS_HEAP_COUNT

Defines whether the OMS heap is divided into segments

If the OMS heap is not subdivided, the internal heap memory management locks the entire OMS heap whenever a DB procedure requests or releases memory.

Restart required after change

OMS_HEAP_LIMIT

Defines the maximum size of the OMS heap (in KB)

Restart required after change

OMS_HEAP_THRESHOLD

Defines memory usage by the OMS heap (in %)

Restart required after change

OMS_VERS_THRESHOLD

Defines memory usage by the OMS heap (in KB)

Restart required after change

See also:

Structure linkDatabase Administration in CCMS: SAP liveCache Technology documentation.

 

Leaving content frame