Oracle常用小知識(一)

1、用戶解鎖及修改密碼

--以解鎖scott用戶爲例
alter user scott account unlock;
--修改scott用戶密碼爲tiger
alter user scott identified by tiger;

2、創建表空間

--創建數據表空間
create tablespace oags
logging
datafile 'E:\oracle\product\10.2.0\oradata\orcl\oags.dbf'
size 32m
autoextend on
next 32m maxsize 20480m
extent management local; 

3、給用戶添加權限

GRANT CREATE USER,DROP USER,ALTER USER ,CREATE ANY VIEW ,
   DROP ANY VIEW,EXP_FULL_DATABASE,IMP_FULL_DATABASE,
      DBA,CONNECT,RESOURCE,CREATE SESSION  TO oa

4、創建用戶

create user oa identified by oa
default tablespace oa
temporary tablespace oa_temp;

5、查詢用戶連接

select p.spid,
       a.serial#,
       c.object_name,
       b.session_id,
       b.oracle_username,
       b.os_user_name
  from v$process p, v$session a, v$locked_object b, all_objects c
 where p.addr = a.paddr
   and a.process = b.process
   and c.object_id = b.object_id

6、查詢表空間使用量(好大一堆，誰能記得住啊)

select a.tablespace_name,
       a.bytes / 1024 / 1024 "Sum MB",
       (a.bytes - b.bytes) / 1024 / 1024 "used MB",
       b.bytes / 1024 / 1024 "free MB",
       round(((a.bytes - b.bytes) / a.bytes) * 100, 2) "percent_used(%)"
  from (select tablespace_name, sum(bytes) bytes
          from dba_data_files
         group by tablespace_name) a,
       (select tablespace_name, sum(bytes) bytes, max(bytes) largest
          from dba_free_space
         group by tablespace_name) b
 where a.tablespace_name = b.tablespace_name
 order by ((a.bytes - b.bytes) / a.bytes) desc;