Oracle12C 用户建立、修改、受权、删除、登陆等操做

1.以系统用户命令行登陆： sqlplus sys/sys as sysdba; 2. 确认选择CDB select name,cdb from v$database;   col pdb_name for a30 select pdb_id,pdb_name,dbid,status,creation_scn from dba_pdbs; select con_id,dbid,NAME,OPEN_

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