BPCSIZE - Cache Size for Natural Buffer Pool

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# BPCSIZE - Cache Size for Natural Buffer Pool

This Natural profile parameter specifies the size of the buffer pool cache (in KB) for a Natural local buffer pool.

Possible settings | `0` | If `BPCSIZE=0` is set, no buffer pool cache is used.
`100 - 2097148` (2 GB - 4 KB) | The buffer pool cache size in KB for cache in data space; that is, with `C64``=OFF`. Note The specified value is rounded to the next 4 KB boundary.
`100 - 58720256` (56 GB) | The buffer pool cache size in KB for cache "above the bar"; that is, with `C64``=ON`. Note The specified value is rounded to the next 1 MB boundary.
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

Notes:

1. This Natural profile parameter is applicable under z/OS (not for Com-plete and not for IMS TM).
2. It corresponds to the `CSIZE` subparameter of the `BPI` profile parameter or `NTBPI` macro.
3. Internally, the `BPCSIZE` specification is converted into the equivalent `BPI` specification, for example: `BPCSIZE=4000` is converted into `BPI=(TYPE=NAT,SEQ=0,CSIZE=4000)`.
4. If the value specified exceeds the possible maximum, the possible maximum value will be taken instead.
5. The `BPCSIZE` parameter applies to the primary Natural buffer pool (`TYPE``=NAT`, `SEQ``=0`) only. In the case of a Natural global buffer pool, it is ignored. If there is a primary buffer pool with `SEQ=0` in the Natural parameter module, only the cache size setting of this buffer pool is updated.
6. In multi-user environments (for example, under CICS), the `BPCSIZE` parameter affects the very first Natural session only, which initializes the Natural local buffer pool.
7. 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`.
8. For more information, see Buffer Pool Cache in the Operations documentation.