national character set AL16UTF16
set time_zone=’America/New_York’;
############### 数据字典 ##########
set wrap off
select * from v$dba_users;
grant select on table_name to user/rule;
select * from user_tables;
select * from all_tables;
select * from dba_tables;
revoke dba from user_name;
shutdown immediate
startup nomount
select * from v$instance;
select * from v$sga;
select * from v$tablespace;
alter session set nls_language=american;
alter database mount;
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