DFHSTUP name | Field name | Description |
---|---|---|
Buffer Size | A08BKBSZ | The size of the buffers that are available to CICS®.
Buffers can be specified through:
Reset characteristic: not reset
|
Number | A08BKBFN | The number of buffers of each size available to CICS:
Reset characteristic: not reset
|
Lookasides | A08BKBFF | The number of read requests that VSAM was able
to satisfy without initiating an I/O operation; that is, the requested
record, whether index or data, was already present in one of the buffer
resident CIs. This means that no physical I/O must be done to put
the control interval in the buffer. The tuning methodology usually employed involves either increasing the number of buffers of a particular CI size until the ratio of lookasides to READs stops increasing significantly or, conversely, reducing the number of buffers until the ratio of lookasides to READs begins to drop significantly. For most data sets, successful lookaside hits on indexes are more likely. These statistics are obtained from VSAM and represent the activity after the pool was created. Note that these statistics are not reset by CICS under any circumstances. Reset characteristic: not reset
|
Reads | A08BKFRD | The number of I/O operations to the buffers that
VSAM was required to initiate to satisfy the CICS application's
activity. This figure represents failures to find the control interval
in the buffers. These statistics are obtained from VSAM and represent the activity after the pool was created. Note that these statistics are not reset by CICS under any circumstances. Reset characteristic: not reset
|
User writes | A08BKUIW | The number of user-initiated I/O WRITE operations
from the buffers that VSAM was required to initiate to satisfy the CICS application's
activity. These statistics are obtained from VSAM and represent the activity after the pool was created. Note that these statistics are not reset by CICS under any circumstances. Reset characteristic: not reset
|
Non-user writes | A08BKNUW | The number of non-user initiated I/O WRITE operations
from the buffers that VSAM was forced to initiate due to no buffers
being available for reading the contents of a CI. These statistics are obtained from VSAM and represent the activity after the pool was created. Note that these statistics are not reset by CICS under any circumstances. Reset characteristic: not reset
|