Monitor the scheduler

You can monitor Scheduler threads that are in progress with the onstat -g dbc command. You can view information about tasks and sensors that have completed in the ph_run table.

The Scheduler uses two types of threads while it is running:
  • dbWorker: These threads are running scheduled tasks and sensors.
  • dbScheduler: This thread prepares the next task or sensor that is scheduled to be run.

To view information about currently running tasks and sensor, and the next task or sensor that is run, use the onstat -g dbc command.

To view information about tasks and sensor that have completed, query the ph_run table in the sysadmin database. You must be connected to the sysadmin database as user informix or another authorized user.

Examples

The following output from the onstat -g dbc command shows two dbWorker threads and the dbScheduler thread:
Worker Thread(0)    46fa6f10
=====================================
Task:                47430c18
Task Name:           mon_config_startup
Task ID:             3
Task Type:           STARTUP SENSOR
Last Error
    Number               -310
    Message              Table (informix.mon_onconfig)
                           already exists in database.
    Time                 09/11/2007 11:41
    Task Name            mon_config_startup

Task Execution:      onconfig_save_diffs

WORKER PROFILE
    Total Jobs Executed            10
    Sensors Executed                8
    Tasks Executed                  2
    Purge Requests                  8
    Rows Purged                     0

Worker Thread(1)    46fa6f80         
=====================================
Task:                4729fc18         
Task Name:           mon_sysenv
Task ID:             4
Task Type:           STARTUP SENSOR
Task Execution:      insert into mon_sysenv select 1, env_name,
                       env_value FROM sysmaster:sysenv


WORKER PROFILE
    Total Jobs Executed             3
    Sensors Executed                2
    Tasks Executed                  1
    Purge Requests                  2
    Rows Purged                     0


Scheduler Thread    46fa6f80         
=====================================
Run Queue
    Empty
Run Queue Size        0
Next Task             7
Next Task Waittime    57
The following output shows the history of four Scheduler jobs from the ph_run table:
SELECT * FROM ph_run;

RUN_ID          1
RUN_TASK_ID     2
RUN_TASK_SEQ    1
RUN_RETCODE     0
RUN_TIME        2009-07-20 13:04:59
RUN_DURATION    0.131850300007433
RUN_ZTIME       1248109468
RUN_BTIME       1248109468
RUN_MTIME       1248109499

RUN_ID          2
RUN_TASK_ID     3
RUN_TASK_SEQ    1
RUN_RETCODE     0
RUN_TIME        2009-07-20 13:04:59
RUN_DURATION    0.120845244247991
RUN_ZTIME       1248109468
RUN_BTIME       1248109468
RUN_MTIME       1248109499

RUN_ID          3
RUN_TASK_ID     4
RUN_TASK_SEQ    1
RUN_RETCODE     0
RUN_TIME        2009-07-20 13:04:59
RUN_DURATION    0.00254887164461759
RUN_ZTIME       1248109468
RUN_BTIME       1248109468
RUN_MTIME       1248109499

RUN_ID          2087
RUN_TASK_ID     7
RUN_TASK_SEQ    742
RUN_RETCODE     0
RUN_TIME        2009-09-09 11:09:51
RUN_DURATION    0.00489335523104662
RUN_ZTIME       1248109468
RUN_BTIME       1248109468
RUN_MTIME       1252508991

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