Example: Analyzing workloads by activity type

In some situations, you might be interested in the behavior of a certain type of activities, such as LOAD activities. For example, you can observe how many LOAD activities are currently in the system as follows:

SELECT COUNT(*)
FROM TABLE(WLM_GET_WORKLOAD_OCCURRENCE_ACTIVITIES(CAST(NULL AS BIGINT), -2))
AS ACTS
WHERE ACTIVITY_TYPE = 'LOAD'

You can obtain a count of how many activities of a specific type have been submitted since the last reset of the Db2 workload management statistics by using the WLM_GET_WORK_ACTION_SET_STATS table function, as shown in the following example. Assume that the READCLASS and LOADCLASS work classes exist for activities of type READ and activities of type LOAD. The * represents all activities that do not fall into the READCLASS or LOADCLASS work class.

SELECT SUBSTR(WORK_ACTION_SET_NAME,1,18) AS WORK_ACTION_SET_NAME,
       SUBSTR(CHAR(DBPARTITIONNUM),1,4) AS PART,
       SUBSTR(WORK_CLASS_NAME,1,15) AS WORK_CLASS_NAME,
       LAST_RESET,
       SUBSTR(CHAR(ACT_TOTAL),1,14) AS TOTAL_ACTS
FROM TABLE(WLM_GET_WORK_ACTION_SET_STATS('', -2)) AS WASSTATS
ORDER BY WORK_ACTION_SET_NAME, WORK_CLASS_NAME, PART

WORK_ACTION_SET_NAME PART WORK_CLASS_NAME LAST_RESET                 TOTAL_ACTS
-------------------- ---- --------------- -------------------------- ----------
AdminActionSet       0    ReadClass       2005-11-25-18.52.49.343000 8
AdminActionSet       1    ReadClass       2005-11-25-18.52.50.478000 0
AdminActionSet       0    LoadClass       2005-11-25-18.52.49.343000 2
AdminActionSet       1    LoadClass       2005-11-25-18.52.50.478000 0
AdminActionSet       0    *               2005-11-25-18.52.50.478000 0
AdminActionSet       1    *               2005-11-25-18.52.50.478000 0

You can view the average lifetime of LOAD activities by creating a work action set to map LOAD activities to a specific service subclass. For example, suppose you map LOAD activities to the service subclass LOADSERVICECLASS under the service superclass MYSUPERCLASS. Then, you can query the WLM_GET_SERVICE_SUBCLASS_STATS table function:

SELECT SUBSTR(SERVICE_SUPERCLASS_NAME,1,19) AS SUPERCLASS_NAME,
       SUBSTR(SERVICE_SUBCLASS_NAME,1,18) AS SUBCLASS_NAME,
       SUBSTR(CHAR(DBPARTITIONNUM),1,4) AS PART,
       CAST(COORD_ACT_LIFETIME_AVG / 1000 AS DECIMAL(9,3)) AS AVGLIFETIME
FROM TABLE
   (WLM_GET_SERVICE_SUBCLASS_STATS('MYSUPERCLASS', 'LOADSERVICECLASS', -2))
AS SCSTATS
ORDER BY SUPERCLASS_NAME, SUBCLASS_NAME, PART

SUPERCLASS_NAME     SUBCLASS_NAME      PART AVGLIFETIME
------------------- ------------------ ---- ----------------------
SYSDEFAULTUSERCLASS LOADSERVICECLASS   0                  4691.242
SYSDEFAULTUSERCLASS LOADSERVICECLASS   1                  4644.740
SYSDEFAULTUSERCLASS LOADSERVICECLASS   2                  4612.431
SYSDEFAULTUSERCLASS LOADSERVICECLASS   3                  4593.451