WLM_GET_SERVICE_SUBCLASS_STATS table function - Return statistics of service subclasses

Example 1: Because every activity must be mapped to a DB2® service class before being run, you can monitor the global state of the system by using the service class statistics table functions and querying all of the service classes on all members. In the following example, a null value is passed for service_superclass_name and service_subclass_name to return statistics for all service classes, and the value -2 is specified for member to return statistics for all members:

 SELECT SUBSTR(SERVICE_SUPERCLASS_NAME,1,19) AS SUPERCLASS_NAME,
       SUBSTR(SERVICE_SUBCLASS_NAME,1,18) AS SUBCLASS_NAME,
       SUBSTR(CHAR(MEMBER),1,4) AS MEMB,
       CAST(COORD_ACT_LIFETIME_AVG / 1000 AS DECIMAL(9,3))
         AS AVGLIFETIME,
       CAST(COORD_ACT_LIFETIME_STDDEV / 1000 AS DECIMAL(9,3))
         AS STDDEVLIFETIME,
       SUBSTR(CAST(LAST_RESET AS VARCHAR(30)),1,16) AS LAST_RESET
  FROM TABLE(WLM_GET_SERVICE_SUBCLASS_STATS(CAST(NULL AS VARCHAR(128)),
       CAST(NULL AS VARCHAR(128)), -2)) AS SCSTATS
  ORDER BY SUPERCLASS_NAME, SUBCLASS_NAME, MEMB

SUPERCLASS_NAME     SUBCLASS_NAME      MEMB ...
------------------- ------------------ ---- ...
SYSDEFAULTUSERCLASS SYSDEFAULTSUBCLASS 0    ...
SYSDEFAULTUSERCLASS SYSDEFAULTSUBCLASS 1    ...
SYSDEFAULTUSERCLASS SYSDEFAULTSUBCLASS 2    ...
SYSDEFAULTUSERCLASS SYSDEFAULTSUBCLASS 3    ...

... AVGLIFETIME STDDEVLIFETIME LAST_RESET
... ----------- -------------- ----------------
...     691.242         34.322 2006-07-24-11.44
...     644.740         22.124 2006-07-24-11.44
...     612.431         43.347 2006-07-24-11.44
...     593.451         28.329 2006-07-24-11.44

Example 2: The same table function can also give the highest value for average concurrency of coordinator activities running in the service class on each member:

  SELECT SUBSTR(SERVICE_SUPERCLASS_NAME,1,19) AS SUPERCLASS_NAME,
         SUBSTR(SERVICE_SUBCLASS_NAME,1,18) AS SUBCLASS_NAME,
         SUBSTR(CHAR(MEMBER),1,4) AS MEMB,
         CONCURRENT_ACT_TOP AS ACTTOP,
         CONCURRENT_WLO_TOP AS CONNTOP
  FROM TABLE(WLM_GET_SERVICE_SUBCLASS_STATS(CAST(NULL AS VARCHAR(128)),
         CAST(NULL AS VARCHAR(128)), -2)) AS SCSTATS
  ORDER BY SUPERCLASS_NAME, SUBCLASS_NAME, MEMB

Sample output is as follows:

SUPERCLASS_NAME     SUBCLASS_NAME      MEMB ACTTOP    CONNTOP
------------------- ------------------ ---- --------- ---------
SYSDEFAULTUSERCLASS SYSDEFAULTSUBCLASS 0           10         7
SYSDEFAULTUSERCLASS SYSDEFAULTSUBCLASS 1            0         0
SYSDEFAULTUSERCLASS SYSDEFAULTSUBCLASS 2            0         0
SYSDEFAULTUSERCLASS SYSDEFAULTSUBCLASS 3            0         0

Example 3: If an activity uses thresholds with REMAP ACTIVITY TO actions, the activity might spend time in more than one service class during its lifetime. You can determine how many activities have passed through a set of service classes by looking at the ACT_REMAPPED_IN and ACT_REMAPPED_OUT columns, as shown in the following example:

SELECT SUBSTR(SERVICE_SUPERCLASS_NAME,1,19) AS SUPERCLASS_NAME,
       SUBSTR(SERVICE_SUBCLASS_NAME,1,18) AS SUBCLASS_NAME,
       ACT_REMAPPED_IN AS MAPPED_IN,
       ACT_REMAPPED_OUT AS MAPPED_OUT
FROM TABLE(WLM_GET_SERVICE_SUBCLASS_STATS(CAST(NULL AS VARCHAR(128)),
       CAST(NULL AS VARCHAR(128)), -2)) AS SCSTATS
ORDER BY SUPERCLASS_NAME, SUBCLASS_NAME

Sample output is as follows:

SUPERCLASS_NAME     SUBCLASS_NAME      MAPPED_IN MAPPED_OUT
------------------- ------------------ --------- ----------
SYSDEFAULTUSERCLASS SYSDEFAULTSUBCLASS         0          0
SUPERCLASS1         SYSDEFAULTSUBCLASS         0          0
SUPERCLASS1         SUBCLASS1                  0          7
SUPERCLASS1         SUBCLASS2                  7          0