Oracle教程 2023-02-24

Oracle 视图 V$ROLLNAME 官方解释，作用，如何使用详细说明

V$ROLLNAME是一种固定视图，用于查看在当前数据库会话中活动的角色名称及关联的系统权限。

V$ROLLNAME视图含有以下3列：

• USERNAME：该列显示数据库中拥有活动角色的用户名。

• ROLLNAME：该列显示活动角色的名称。

• PRIVILEGE：该列显示该活动角色具有的系统权限。

使用V$ROLLNAME视图，可以快速查看当前数据库会话的活动角色名称及关联的系统权限。另外，还可以通过以下语句来查看V$ROLLNAME视图的内容：

SELECT * FROM V$ROLLNAME;

V$ROLLNAME lists the names of all online rollback segments. It can only be accessed when the database is open.

Column Datatype NULL Description

Column	Datatype	NULL	Description
`USN`	`NUMBER`		Rollback (undo) segment number
`NAME`	`VARCHAR2(30)`	`NOT NULL`	Rollback segment name
`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

USN

NUMBER

Rollback (undo) segment number

NAME

VARCHAR2(30)

NOT NULL

Rollback segment name

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

分享到：