Oracle教程 2023-04-02

Oracle 视图 V$AQ_NONDUR_SUBSCRIBER_LWM 官方解释，作用，如何使用详细说明

本站中文解释

V$AQ_NONDUR_SUBSCRIBER_LWM是一个视图，由Oracle自动维护，它提供Oracle Streams Advanced Queuing（AQ）的非持久订阅者的当前底层低水位（LWM）。

使用方法：

可以使用V$AQ_NONDUR_SUBSCRIBER_LWM视图来查看Oracle Streams AQ非持久订阅者当前LWM来识别他们接收哪些消息。它以这样的方式与一般的DDL功能一起使用：

SELECT subscriber_name, lwm FROM v$aq_nondur_subscriber_lwm;

此查询将返回所有非持久订阅者的名称和当前低水位。

官方英文解释

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

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