LSR pool: Buffer statistics

Table 1. LSR pool: Buffer statistics
DFHSTUP name	Field name	Description
Buffer Size	A08BKBSZ	The size of the buffers that are available to CICS®. Buffers can be specified through: The DEFINE LSRPOOL command of resource definition online A CICS calculation at the time the LSRPOOL is built buffers to use. 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

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Last updated: Thursday, 27 June 2019