Field descriptions of the Structure Activity Section
PRODUCED BY CMF ANALYZER (v.r.mm RSL yymm ) COUPLING FACILITY ACTIVITY REPORT RPTSEQ 3 PAGE 17
BMC SOFTWARE, INC. XYZ COMPANY REPORT DATE: dd mmm yy 16.06
ACTL dd mmm yy 11.45.00 dd mmm yy 14.30.00 HQ LOCATION SYSTEM ID: ESAJ Z v.rr.n
BASED ON REC TYPE/# RECS/# SAMPLES/REC HOURS: 74-4/130/11.6K/16.13
COUPLING FACILITY = CF16 --------------------- STRUCTURE ACTIVITY SECTION ---------------------------------------------------
-------------------------------------------------- STRUCTURE = DFHCFLS_DFHRSTAT ---------------------------------------------------
TYPE = LIST SIZE = 96291K ENCRYPTED = NO
SYSTEM ------------------ REQUESTS ------------------- -------------- QUEUED REQUESTS ---------------
NAME TYPE PER COUNT % OF -SERVICE TIME-- DELAY # % ----- DELAY TIME ------
SEC ALL AVG STD DEV REASON REQ REQ /REQ S DEV /ALL
-------- ------- ------- --------- ----- ------- ------- -------- ------- ----- ------- ------- -------
SJSC ALL 0 0 0 0 0 NO SCH 0 0 0 0 0
SYNC 0 0 0 0 0
ASYNC 0 0 0 0 0
CNVAS 0 0 0 DUMP 0 0 0 0 0
SUPPR 0 0 0
-------- ------- ------- --------- ----- ------- ------- -------- ------- ----- ------- ------- -------
SUMMARY ALL 0 0 0 0 0 NO SCH 0 0 0 0 0
SYNC 0 0 0 0 0
ASYNC 0 0 0 0 0
CNVAS 0 0 0 DUMP 0 0 0 0 0
SUPPR 0 0 0The following table describes each field on the Structure Activity Section of the Coupling Facility Activity Report.
Field | Description | |
|---|---|---|
STRUCTURE | Name of the structure, up to 16 characters long Note When there are multiple instances of the same structure, the activity data of all instances is combined. | |
TYPE | First user connecting to a structure specifies its type Possible values for this field are as follows:
If there is no activity against a structure from any connected system, its type is listed as UNK (for unknown). | |
SIZE | Structure size in either K or M, if the size in K is a multiple of 1024 or greater than 99999 | |
ENCRYPTED (PTF BQM1388 applied) | Whether the CF structure is encrypted Possible values are:
| |
SYSTEM NAME | Name of the system that is originating the requests against this structure | |
REQUESTS - TYPE | Type of requests: synchronous (SYNC), asynchronous (ASYNC), originated as synchronous but converted to asynchronous (CNVAS), suppressed (SUPPR) ALL is the total for all request types. | |
REQUESTS - PER SEC | Rate per second of requests that originated from a system against this structure, viewed by request type | |
REQUESTS - COUNT | Number of requests that originated from a system against this structure, viewed by request type | |
REQUESTS - % OF ALL | Percentage of requests of a type that originated from a system, compared with the total number of requests from all systems against this structure | |
REQUESTS - SERVICE TIME - AVG, STD DEV | Average number of microseconds that are required to complete a request (excluding queue time) and its standard deviation The service time of synchronous-converted-to-asynchronous (CNVAS) requests is included in that of asynchronous (ASYNC) requests. | |
QUEUED REQUESTS - DELAY REASON | Reason that a request gets queued Possible values for this field are as follows:
| |
QUEUED REQUESTS - # REQ | Total number of requests to this structure that are delayed in this interval | |
QUEUED REQUESTS - % REQ | Percentage of requests to this structure that are delayed in this interval | |
DELAY TIME / REQ | Average delay time for each delayed request in microseconds | |
DELAY TIME S DEV | Standard deviation of the average delay time for delayed requests | |
DELAY TIME / ALL | Average delay time for all requests to the structure in microseconds This number indicates how delays are affecting overall request activity to the structure. | |
EXTERNAL CONTENTION - REQ TOTAL | Total number of requests to the structure 1 | |
EXTERNAL CONTENTION - DEFERRED | Number of requests to the structure that were unable to be completed within the request issuers thread 1 | |
EXTERNAL CONTENTION - TOTAL | Number of requests to the structure that were delayed due to lock contention 2 This number is a subset of DEFERRED. | |
EXTERNAL CONTENTION - FALSE | Number of requests to the structure that were delayed due to false lock contention 2 False lock contention occurs when a user-supplied hash value is used to map a lock request to a lock entry and multiple unique lock requests hash to a single lock table entry. This number is a subset of the total lock contention count. Note A high false lock contention count indicates either a poor hashing algorithm or an inadequate number of lock table entries. | |
DATA ACCESS - READS | Total number of read hits for a cache structure read request for the interval 3 | |
DATA ACCESS - WRITES | Total number of write hits for a cache structure write request for the interval 3 | |
DATA ACCESS - CASTOUTS | Total number of castouts for a cache structure for the interval 3 Castouts occur when changed data is written to DASD. The castout count can indicate the volume of changed data being removed from a store-in cache structure, such as the IBM Db2 global buffer pool structures. | |
DATA ACCESS - XI’s | Number of times that a data item residing in a local buffer pool was marked invalid by the coupling facility 3 The XI count indicates the amount of data sharing among the users of the cache structure and the amount of write or update activity against the cache data. | |
1 This field is applicable only to serialized list or lock structures.
2 This field is applicable only to lock structures.
3 This field is applicable only to cache structures.
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