This Natural profile parameter is applicable under z/OS and z/VSE only (not for Com-plete and not for IMS TM).
It specifies the size of the buffer pool cache (in KB) for a local
Natural buffer pool. It corresponds to the CSIZE subparameter of
the BPI profile
parameter or NTBPI
macro.
| Possible settings | 0 |
Size of the buffer pool cache in KB.
If BPCSIZE=0 is set, no buffer pool cache is used.
|
|
|---|---|---|---|
4 to 2097148 |
(that is, 4 KB - 2 GB) for cache in
data space, that is, with C64=OFF.
|
||
100 to 58720256 |
(that is, 56 GB) for cache
"above the bar", that is, with C64=ON.
|
||
|
Note: |
|||
| Default setting | 0 |
By default, no buffer pool cache is used. | |
| Dynamic specification | yes | This parameter can only be specified dynamically. | |
| Specification within session | no | ||
The BPCSIZE parameter applies to the primary
Natural buffer pool (TYPE=NAT,
SEQ=0) only.
In the case of a global buffer pool, it is ignored. If there is a primary
buffer pool with SEQ=0 in
NATPARM, only the
CSIZE setting of this buffer pool is updated.
In multi-user environments (for example, under CICS), the
BPCSIZE parameter affects the very first Natural session only,
which initializes the local buffer pool.
The type of storage to be used for the buffer pool cache is determined by
profile parameter BPC64 or subparameter
C64 of profile
parameter BPI or
macro NTBPI.
Internally, the BPCSIZE specification is converted
into the equivalent BPI specification.
BPCSIZE=4000 |
is converted into: |
BPI=(TYPE=NAT,SEQ=0,CSIZE=4000) |
For more information see Buffer Pool Cache in the Operations documentation.
