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

8.34 V$AQ_SHARDED_SUBSCRIBER_STAT

V$AQ_SHARDED_SUBSCRIBER_STAT displays basic statistical information about the subscribers of sharded queues. There is one row per queue per shard per subscriber.

Note:

AQ sharded queues are deprecated in Oracle Database 21c. Oracle recommends that you instead use Transactional Event Queues (TEQs) for higher throughput and better performance.
Column Datatype Description

QUEUE_ID

NUMBER

Queue identifier

SUBSCRIBER_ID

NUMBER

Subscriber identifier

SHARD_ID

NUMBER

Shard identifier

PRIORITY

NUMBER

Priority value of the shard

MSG_SN

NUMBER

Message serial number

DEQUEUE_SUBSHARD

NUMBER

Last known dequeue position in this shard

ENQUEUED_MSGS

NUMBER

Number of enqueued messages

DEQUEUED_MSGS

NUMBER

Number of dequeued messages

ELAPSED_DEQUEUE_TIME

NUMBER

Amount of time spent performing dequeues (in seconds)

CPU_DEQUEUE_TIME

NUMBER

Actual amount of CPU time spent performing dequeues (in seconds)

DEQUEUE_RATE

NUMBER

Number of messages dequeued per second

DEQUEUE_POSITIONFoot 1

RAW(16)

Message ID at the dequeue position of the subscriber in this shard

A NULL value indicates that either the shard is empty or no dequeues have been done on this shard.

TIME_SINCE_LAST_DEQUEUE

NUMBER

Time since last dequeue activity (in seconds)

ESTD_TIME_TO_DRAIN

NUMBER

Estimated amount of time to drain the shard (in seconds) with current enqueue and dequeue rates. Null, if the enqueue rate is greater than the dequeue rate.

ESTD_TIME_TO_DRAIN_NO_ENQ

NUMBER

Estimated amount of time to drain the shard (in seconds) with no new enqueues

MESSAGE_LATENCY_1Foot 1

NUMBER

Message latency within the last 5 minutes (in milliseconds). Null if no message is consumed or it is delay dequeue.

MESSAGE_LATENCY_2Foot 1

NUMBER

Message latency within the last 1 hour (in milliseconds). Null if no message is consumed or it is delay dequeue.

MESSAGE_LATENCY_3Foot 1

NUMBER

Message latency within the last 5 hours (in milliseconds). Null if no message is consumed or it is delay dequeue.

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

Footnote 1 This column is available starting with Oracle Database 21c.