27.Oracle杂记——Oracle常用动态视图v$rollname

27.Oracle杂记——Oracle常用动态视图v$rollname

视图v$rollname：所有在线回滚段名字

描述如下：

sys@PDB1> desc v$rollname;

 Name                                                                                                     Null?         Type

 ------------------------------------------------------------- ------------------------------------

 USN                                                                                                                                     NUMBER

 NAME                                                                                                    NOT NULL VARCHAR2(30)

 CON_ID                                                                                                                            NUMBER

这3列的描述：

USN表示UNDO 段号

NAME表示回滚段名字

CON_ID： 容器ID（0,1,，n）

这个视图输出比较少，蛤蟆就执行一下，如下：

sys@PDB1> select * from v$rollname;

 

      USN NAME                                                       CON_ID

---------- ----------------------------------------

                   0 SYSTEM                                                                      0