Change number of data spaces for ISAM cache areas
Component: | BS2000 |
Functional area: | System control and optimization |
Domain: | FILE |
Privileges: | TSOS |
Function
The MODIFY-ISAM-CACHING command enables systems support to change the maximum number of data spaces for ISAM cache areas dynamically. ISAM creates these cache areas to add and manage cross-task ISAM pools.
The maximum number of usable data spaces can be increased only if the paging area is large enough. It may be necessary to enlarge the paging area up front.
Information on the maximum number of data spaces for ISAM cache areas and how they are used can be inquired using the SHOW-ISAM-CACHING command.
Format
MODIFY-ISAM-CACHING | Alias: MDISAMC |
CACHE-SIZE = *UNCHANGED / <integer 1..127> | |
Operands
CACHE-SIZE = *UNCHANGED / <integer 1..127>
Specifies the maximum number of data spaces for ISAM cache areas.
CACHE-SIZE = *UNCHANGED
The maximum number of data spaces for ISAM cache areas remains unchanged.
CACHE-SIZE = <integer 1..127>
Specifies the new maximum number of data spaces for ISAM cache areas. The existing value can be increased only if the paging area is large enough.
Return codes
(SC2) | SC1 | Maincode | Meaning/Guaranteed messages |
|---|---|---|---|
0 | CMD0001 | Command executed without errors | |
32 | DMS0A66 | Internal error while executing the command | |
64 | CMD0216 | Privileges error | |
64 | DMS0A67 | ISAM cache cannot be extended/reduced | |
129 | DMS0A68 | ISAM cache cannot be reduced at present |