1. Database Reference
  2. Dynamic Performance Views
  3. Dynamic Performance (V$) Views: V$ACCESS to V$HVMASTER_INFO
  4. V$BUFFERED_QUEUES

8.116 V$BUFFERED_QUEUES

V$BUFFERED_QUEUES displays information about all buffered queues in the instance. There is one row per queue.

Column Datatype Description

QUEUE_ID

NUMBER

Identifier for the queue

QUEUE_SCHEMA

VARCHAR2(128)

Owner of the queue

QUEUE_NAME

VARCHAR2(128)

Name of the queue

STARTUP_TIME

DATE

Startup time

NUM_MSGS

NUMBER

Total number of messages currently in the buffered queue

SPILL_MSGS

NUMBER

Current number of overflow messages spilled to disk from the buffered queue

CNUM_MSGS

NUMBER

Cumulative total number of messages enqueued into the buffered queue since the database last started

CSPILL_MSGS

NUMBER

Cumulative total number of overflow messages spilled to disk from the buffered queue since the database last started

EXPIRED_MSGS

NUMBER

Number of expired messages

OLDEST_MSGID

RAW(16)

Message ID of the oldest message

OLDEST_MSG_ENQTM

TIMESTAMP(3)

Enqueue time of the oldest message

QUEUE_STATE

VARCHAR2(25)

Indicates whether the queue is in recovery mode (QUEUE IS IN RECOVERY MODE) or not (NORMAL)

ELAPSED_ENQUEUE_TIME

NUMBER

Total time spent in enqueue (in hundredths of a second)

ELAPSED_DEQUEUE_TIME

NUMBER

Total time spent in dequeue (in hundredths of a second)

ELAPSED_TRANSFORMATION_TIME

NUMBER

Total time for evaluating transformations (in hundredths of a second)

ELAPSED_RULE_EVALUATION_TIME

NUMBER

Total time for rule evaluations (in hundredths of a second)

ENQUEUE_CPU_TIME

NUMBER

Total CPU time for enqueue (in hundredths of a second)

DEQUEUE_CPU_TIME

NUMBER

Total CPU time for dequeue (in hundredths of a second)

AVG_MSG_AGE

NUMBER

Average age of messages in the queue

LAST_ENQUEUE_TIME

TIMESTAMP(3) WITH TIME ZONE

Last message enqueue time

LAST_DEQUEUE_TIME

TIMESTAMP(3) WITH TIME ZONE

Last message dequeue time

QUEUE_SIZE

NUMBER

Size of queue, which is the total number of bytes allocated for all messages and metadata

CON_ID

NUMBER

The ID of the container to which the data pertains. Possible values include:

  • 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

  • 1: This value is used for rows containing data that pertain to only the root

  • n: Where n is the applicable container ID for the rows containing data