>select * from v$version; //查看12c版本
>select sys_context('USERENV','CON_NAME') from dual; //查看当前使用的容器
>select con_id,dbid,name,open_mode from v$pdbs;
>alter pluggable database pdboaec open;
>select con_id,dbid,name,open_mode from v$pdbs;
>alter session set container=pdboaec; // 切换容器到pdb
>select sys_context('USERENV','CON_NAME') from dual;
>create user sidney identified by out_standing1 default tablespace users quota 10M on users temporary tablespace temp account unlock;
