Oracle教程 2023-03-31

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

Oracle 视图 V$SESSIONS_COUNT 是用于追踪数据库系统中当前活动会话总数（独立进程）的系统视图，可以用来分析用户登录当前数据库系统的活动会话总数，以及及时根据性能瓶颈监控会话数量。

使用 Oracle 视图 V$SESSIONS_COUNT 的步骤如下：

1. 登陆数据库。

2. 执行如下 SQL 语句，查看当前系统活动会话总数：

SELECT COUNT(*) FROM V$SESSIONS_COUNT;

3. 执行如下 SQL 语句，查看指定用户的当前活动会话：

SELECT COUNT(*)
FROM V$SESSIONS_COUNT
WHERE USERNAME=’ ‘;

V$SESSIONS_COUNT displays the current number of sessions for each PDB.

Column Datatype Description

Column	Datatype	Description
`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
`USER_SESSION_COUNT`	`NUMBER`	Displays the current number of user sessions for the PDB
`RECURSIVE_SESSION_COUNT`	`NUMBER`	Displays the current number of recursive sessions for the PDB

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

USER_SESSION_COUNT

NUMBER

Displays the current number of user sessions for the PDB

RECURSIVE_SESSION_COUNT

NUMBER

Displays the current number of recursive sessions for the PDB

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