Measure Reference Manual

FILE-TYPE
One of these values, which indicates the file type:
Unstructured0
Relative1
Entry-sequenced2
Key-sequenced3
OCB-NUMBER
Identification number of the open control block (OCB).
OPENER-CPU
CPU number of the process that opened the measured file.
OPENER-PIN
Process identification number of the process that opened the measured file.
OPENER-SYSTEM-NAME
Name of the system that opened the measured file.
RECORD-TYPE
Type of internal counter record used to record the instrumentation for the DISCOPEN entity.
If the value is 0, the file opened was either a temporary file, a program (object file), or an edit
file. For these types of files, a short form internal record is used, and values are not recorded for
certain counters. For more information, see Usage Notes for All DISCOPEN Entities (page 215).
STORAGE-POOL
Name of the SMF storage pool to which the measured disk is assigned (process name of the storage
pool process).
Common Counter Field DDL Definitions for DISCOPEN Entities
These counter fields are used in both styles of DDL records.
Fields are listed alphabetically.
BLOCK-SPLITS
Number of blocks split during writes to the file.
A block split occurs when you add or lengthen a record in a key-sequenced file and the data block
can no longer contain the entire record. Splitting a data block can cause the index block above
the data block to split as well.
You should keep block splits to a minimum because they require several I/O operations, but you
cannot entirely avoid them when inserting many new records in a key-sequenced file.
Counter type: Incrementing.
CACHE-HITS
Number of times a read operation found the required block in cache, which saves a disk I/O.
If you write a partially filled block to disk, the disk process must read the block (possibly incrementing
this counter), merge the new data into the block, and then write the block to disk. If you write to
DISCOPEN 213