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  v$qmon_coordinator_stats tips

Oracle Database Tips by Donald BurlesonApril 14, 2015

Question:  What does the v$qmon_coordinator_stats view do?
 
Answer: The v$qmon_coordinator_stats view displays statistics about the queue monitor coordinator process (QMNC background task). Also see:

There is one row per instance. the rows are deleted when the database (or instance in an oracle RAC environment) restarts.

select * from v$qmon_coordinator_stats;

The Oracle docs note the following columns in v$qmon_coordinator_stats:

Column

Description

QMNC_PID

Queue Monitor Coordinator process ID

STATUS

Current status of the coordinator:

  • DEAD
  • INITIALIZING
  • RUNNING TASK COORDINATOR
  • WAITING
  • ADDING SERVER

NUM_SERVERS

Number of QMON servers currently running

LAST_SERVER_START_TIME

Last server startup time

LAST_SERVER_PID

Process ID of the last server process (Qnnn) created

NEXT_WAKEUP_TIME

Next wakeup time of the coordinator

NEXT_READY_TIME

Ready time of the first delayed task

NEXT_EXPIRY_TIME

Expiry time of the next ready task

LAST_WAIT_TIME

Time when the coordinator went to sleep

LAST_FAILURE

Last failure encountered

LAST_FAILURE_TIME

Last failure time

MAX_TASK_LATENCY

Maximum task latency across all the servers (in seconds)

MIN_TASK_LATENCY

Minimum task latency across all the servers (in seconds)

TOTAL_TASK_LATENCY

Cumulative latency across all the tasks (in seconds)

TOTAL_TASKS_EXECUTED

Cumulative number of tasks serviced by all the servers

MAX_SERVERS

Maximum number of servers present at any point of time

   
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