select * from all_users; ##查看所有用户
select name from v$database; ##查看当前数据库
database test; ##进入test数据库
select * from v$instance; ##查看所有的数据库实例
shutdown immediate ##关闭数据库
alter user sys identified by new_password; ##更改用户密码
select username,password from dba_users; ##查看当实例中的用户和密码
show parameter control_files; ## 查看控制文件;
select member from v$logfile; ##查看日志文件
show parameter ; ## 查看数据库参数
select * from user_role_privs; ##查看当前用户的角色
select username,default_tablespace from user_users; ##查看当前用户的缺省表空间
alter user system identified by [password] ##修改用户的密码
ALTER USER “SCOTT” ACCOUNT UNLOCK ##解锁SCOTT用户
show parameter processes; ##查看最大会话数
查看当前库的所有数据表：
SQL select TABLE_NAME from all_tables;
select * from all_tables;
SQL select table_name from all_tables where table_name like ‘u’;
TABLE_NAME———————————————default_auditing_options
查看表结构：desc all_tables;
创建用户并赋予权限
###—————————-创建用户并赋予权限————————————####-
create user mpss
identified by “mpss12”
default tablespace TS_MPSS_DATA
temporary tablespace TEMP;
给用户赋予权限
grant connect to mpss;
grant resource,create session to mpss; 开发角色
grant create procedure to dbuser； ＃这些权限足够用于开发及生产环境
给用户授权
grant dba to spms;–授予DBA权限
grant unlimited tablespace to lxg;–授予不限制的表空间
grant select any table to lxg;–授予查询任何表
grant select any dictionary to lxg;–授予 查询 任何字典
删除用户
drop user mpss cascade;
建表空间
###———————————建表空间————————————####-
================建立表空间============================
CREATE TABLESPACE “TS_MPSS_DATA”
LOGGING
DATAFILE ‘/mpss/data/ts_mpss_data.dbf’ SIZE 1024M
EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO
=====================================================
=================建立临时表空间============================
CREATE
TEMPORARY TABLESPACE “SWVIP” TEMPFILE ‘/app/oracle/oradata/
sworacle/SWVIP.dbf’ SIZE 5M EXTENT MANAGEMENT LOCAL UNIFORM
SIZE 1M
=====================================================
create tablespace TS_MPSS_DATA datafile ‘/mpss/data/ts_mpss_data.bdf ‘ size 1024m autoextend on ; ###autoextend on 自动扩展
###————————————————————————————####-
查看表空间
###—————————-查看表空间大小————————————####-
SELECT D.TABLESPACE_NAME “Name”,
TO_CHAR(((((A.BYTES – DECODE(F.BYTES, NULL, 0, F.BYTES)) / 1024 / 1024)) /(A.BYTES / 1024 / 1024))*100,’99,990.9′) “used(%)”,
TO_CHAR((DECODE(F.BYTES, NULL, 0, F.BYTES) / 1024 / 1024),’999,990.9’) “Free (M)”
FROM SYS.DBA_TABLESPACES D, SYS.SM$TS_AVAIL A, SYS.SM$TS_FREE F
WHERE D.TABLESPACE_NAME = A.TABLESPACE_NAME
AND F.TABLESPACE_NAME (+) = D.TABLESPACE_NAME;
###————————————————————————————–####-
SELECT D.TABLESPACE_NAME,SPACE “SUM_SPACE(M)”,BLOCKS SUM_BLOCKS,SPACE-NVL(FREE_SPACE,0) “USED_SPACE(M)”,
ROUND((1-NVL(FREE_SPACE,0)/SPACE)*100,2) “USED_RATE(%)”,FREE_SPACE “FREE_SPACE(M)”
FROM
(SELECT TABLESPACE_NAME,ROUND(SUM(BYTES)/(1024*1024),2) SPACE,SUM(BLOCKS) BLOCKS
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) D,
(SELECT TABLESPACE_NAME,ROUND(SUM(BYTES)/(1024*1024),2) FREE_SPACE
FROM DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) F
WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME(+)
UNION ALL –if have tempfile
SELECT D.TABLESPACE_NAME,SPACE “SUM_SPACE(M)”,BLOCKS SUM_BLOCKS,
USED_SPACE “USED_SPACE(M)”,ROUND(NVL(USED_SPACE,0)/SPACE*100,2) “USED_RATE(%)”,
NVL(FREE_SPACE,0) “FREE_SPACE(M)”
FROM
(SELECT TABLESPACE_NAME,ROUND(SUM(BYTES)/(1024*1024),2) SPACE,SUM(BLOCKS) BLOCKS
FROM DBA_TEMP_FILES
GROUP BY TABLESPACE_NAME) D,
(SELECT TABLESPACE_NAME,ROUND(SUM(BYTES_USED)/(1024*1024),2) USED_SPACE,
ROUND(SUM(BYTES_FREE)/(1024*1024),2) FREE_SPACE
FROM V$TEMP_SPACE_HEADER
GROUP BY TABLESPACE_NAME) F
WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME(+) ;
查看表空间物理文件的名称及大小;
###——————–表空间物理文件的名称及大小————————####-
select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space
from dba_data_files
order by tablespace_name;
###————————————————————————————####-
查看数据文件放置的路径
###————————————————————————————####-
SQL col file_name format a50
SQL select tablespace_name,file_id,bytes/1024/1024,file_name from dba_data_files order by file_id;
###————————————————————————————####-
查看数据库库对象
select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;
用系统管理员，查看当前数据库有几个用户连接：
SQL select username,sid,serial# from v$session;
扩表空间
###————————————————————————————####-
alter tablespace G000 add datafile ‘/dev/vgbilling/rg000_lv03′ SIZE 7500m;
给表G000增加一个7500m的逻辑卷’/dev/vgbilling/rg000_lv03’
###————————————————————————————####-
检查被长时间锁的对象
###————————————————————————————####-
SQL select a.session_id,a.process,a.locked_mode,b.object_name,b.object_type,b.status from v$locked_object a,dba_objects b where a.object_id=b.object_id;
###————————————————————————————####-
