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

8.26 V$AQ_NONDUR_SUBSCRIBER_LWM

V$AQ_NONDUR_SUBSCRIBER_LWM projects the low watermarks (LWMs) of non-durable subscribers in a sharded queue. The LWM of a non-durable subscriber is a combination of shard, priority and LWM (subshard).

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 ID

SUBSCRIBER_ID

NUMBER

ID of the non-durable subscriber

SHARD_ID

NUMBER

Shard ID

PRIORITY

NUMBER

Priority of the shard

LWM

NUMBER

Lower watermark (in a subshard) of the non-durable subscriber

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

See Also:

Oracle Database Advanced Queuing User's Guide for more information about Oracle Database Advanced Queueing