liveCache Database Parameters 
Use
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.
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
SAP customers can find a detailed description of the liveCache database parameters in SAP note 833216.
liveCache Database Parameters
Parameter |
Meaning |
Parameter Can Be Changed with the Database Manager CLI While in Operation |
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. |
Yes |
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. |
No |
OMS_HEAP_LIMIT |
Defines the maximum size of the OMS heap (in KB) |
No |
OMS_HEAP_THRESHOLD |
Defines memory usage by the OMS heap (in %) |
No |
OMS_VERS_THRESHOLD |
Defines memory usage by the OMS heap (in KB) |
No |
See also:
Database
Administration in CCMS: SAP liveCache