首页
学习
活动
专区
工具
TVP
发布

oracle常用命令大全

一、Oracle数据库实例、用户、目录及session会话查看:

1、ORACLE SID查看设置

查看SID、用户名

$ env|grep SID 、select * from v$instance、select instance_name,host_name from v$instance;

查看数据库所有用户及用户状态:

SQL> select usernames,account_status from dba_users;

设置SID

$ export ORACLE_SID=hisvhfs

查看数据库DBID:

SQL>select * from v$DBID

2、查询、设置Oracle数据库实例最大进程数及最大会话数

查看系统最大session:

SQL>show parameter session

查看当前连接数:

SQL>select count(*) from v$bgprocess

查看系统最大进程数:

SQL>show parameter process

查看当前连接到数据库的用户:

SQL>select count(*) from v$session

查看当前数据库建立的会话情况:

SQL> select sid,serial#,username,program,machine,status from v$session;

查询应用的连接数SQL:

SQL> SELECT b.MACHINE, b.PROGRAM, COUNT (*)

FROM v$process a, v$session b

WHERE a.ADDR = b.PADDR AND b.USERNAME IS NOT NULL

GROUP BY b.MACHINE, b.PROGRAM

ORDER BY COUNT (*) DESC;

查看当前数据库的并发连接数

SQL> select count(*) from v$session where status='ACTIVE';

查看当前有哪些用户正在使用数据:

select osuser,a.username,cpu_time/executions/1000000||'s',sql_fulltext,machine

from v$session a,v$sqlarea b

where a.sql_address = b.address

order by cpu_time/executions desc;

查看数据库指定用户的连接情况

SQL> select sid,serial# from v$session where username='XX'; XX为用户

例如:

SQL> select sid,serial# from v$session where username='BSPDEV';

SID SERIAL#

---------- ----------

204 4609

399 5841

590 6041

清除用户下连接进程

SQL> alter system kill session '204,4609';

SQL> alter system kill session '399,5841';

SQL> alter system kill session '590,6041';

修改processes和sessions值

SQL> alter system set processes=300 scope=spfile;

系统已更改。

SQL> alter system set sessions=335 scope=spfile;

系统已更改。

修改processes和sessions值必须重启oracle服务器才能生效

ORACLE的连接数(sessions)与其参数文件中的进程数(process)有关,它们的关系如下:

sessions=(1.1*process+5)

3、查看数据库目录

SQL> select * from all_directories;

4、查看数据库现有模式、是否归档

SQl>select name,log_mode from v$database;

也可以用下面的语句

archive log list;(该方法需要as sysdba)

查看数据库的创建日期和归档方式

SQL> Select Created, Log_Mode, Log_Mode From V$Database;

5、配置用户密码过期时间

alter profile "default" limit password_life_time unlimited; 配置用户密码永不过期

alter profile "default" limit password_life_time 100; 配置用户密码100天过期

6、创建、配置新用户及查看用户属性

解锁新用户:

SQL> alter user scott account unlock;

SQL> alter user scott identified by tiger;

删除oracle用户:

SQL>drop user username cascade; (删除与用户相关的所有对象)

这样该用户包括该用户下的表,试图,同义词,过程,索引,及相关的一切就删除了。

创建用户并赋权限以及设置默认表空间。

以sysdba用户登陆进行以下设置:

-- Create the user

create user VHFSM

identified by vhnj1fsm

default tablespace MGRVHFSTBSDEF 此处是设置默认表空间。

temporary tablespace TEMP

profile DEFAULT

quota unlimited on mgrvhfstbs2010此处是设置可操作的其他表空间

quota unlimited on mgrvhfstbsdef;

-- Grant/Revoke role privileges

grant connect to VHFSM;

grant dba to VHFSM;

-- Grant/Revoke system privileges

grant unlimited tablespace to VHFSM;

查看用户及角色权限

--1.查看所有用户:

select * from dba_users;

select * from all_users;

select * from user_users;

--2.查看用户或角色系统权限(直接赋值给用户或角色的系统权限):

select * from dba_sys_privs;

select * from user_sys_privs;

--3.查看角色(只能查看登陆用户拥有的角色)所包含的权限

sql>select * from role_sys_privs;

--4.查看用户对象权限:

select * from dba_tab_privs;

select * from all_tab_privs;

select * from user_tab_privs;

--5.查看所有角色:

select * from dba_roles;

--6.查看用户或角色所拥有的角色:

select * from dba_role_privs;

select * from user_role_privs;

--7.查看哪些用户有sysdba或sysoper系统权限(查询时需要相应权限)

select * from V$PWFILE_USERS

--注意:

--1、以下语句可以查看Oracle提供的系统权限

select name from sys.system_privilege_map

--2、查看一个用户的所有系统权限(包含角色的系统权限)

SELECT privilege

FROM dba_sys_privs

WHERE grantee = 'DATAUSER'

UNION

SELECT privilege

FROM dba_sys_privs

WHERE grantee IN (SELECT granted_role FROM dba_role_privs WHERE grantee = 'DATAUSER');

二、创建、管理Oracle表空间

1、先查询空闲空间

select tablespace_name,file_id,block_id,bytes,blocks from dba_free_space;

2、增加Oracle表空间

先查询数据文件名称、大小和路径的信息,语句如下:

select tablespace_name,file_id,bytes,file_name from dba_data_files;

3、修改文件大小语句如下

alter database datafile

'需要增加的数据文件路径,即上面查询出来的路径

'resize 800M;

4、创建Oracle表空间

create tablespace test

datafile '/home/app/oracle/oradata/oracle8i/test01.dbf' size 8M

autoextend on

next 5M

maxsize 10M;

create tablespace sales

datafile '/home/app/oracle/oradata/oracle8i/sales01.dbf' size 800M

autoextend on

next 50M

maxsize unlimited

maxsize unlimited 是大小不受限制

create tablespace sales

datafile '/home/app/oracle/oradata/oracle8i/sales01.dbf' size 800M

autoextend on

next 50M

maxsize 1000M

extent management local uniform;

unform表示区的大小相同,默认为1M

create tablespace sales

datafile '/home/app/oracle/oradata/oracle8i/sales01.dbf' size 800M

autoextend on

next 50M

maxsize 1000M

extent management local uniform size 500K;

unform size 500K表示区的大小相同,为500K

create tablespace sales

datafile '/home/app/oracle/oradata/oracle8i/sales01.dbf' size 800M

autoextend on

next 50M

maxsize 1000M

extent management local autoallocate;

autoallocate表示区的大小由随表的大小自动动态改变,大表使用大区小表使用小区

create tablespace sales

datafile '/home/app/oracle/oradata/oracle8i/sales01.dbf' size 800M

autoextend on

next 50M

maxsize 1000M

temporary;

temporary创建字典管理临时表空间 ,要创建本地管理临时表空间要加temporary tablespace关键字

create temporary tablespace sales

tempfile '/home/app/oracle/oradata/oracle8i/sales01.dbf' size 800M

autoextend on

next 50M

maxsize 1000M

创建本地管理临时表空间,如果是临时表空间,所有语句中的datafile都换为tempfile ,所有语句中的datafile都换为tempfile8i

为表空间增加数据文件:

alter tablespace sales add

datafile '/home/app/oracle/oradata/oracle8i/sales02.dbf' size 800M

autoextend on next 50M

maxsize 1000M;

5、查看表空间是否自动扩展

SQL> select file_id,file_name,tablespace_name,autoextensible,increment_by from dba_data_files order by file_id desc;

更改自动扩展属性:

alter database datafile

'/home/app/oracle/oradata/oracle8i/sales01.dbf',

'/home/app/oracle/oradata/oracle8i/sales02.dbf'

'/home/app/oracle/oradata/oracle8i/sales01.dbf

autoextend off;

6、表空间的查看与修改

查看用户默认表空间

SQL> select username,default_tablespace from dba_users;查看所有用户的默认表空间

SQL> select username,default_tablespace from user_users;查看某个用户的默认表空间,前提需要connect该用户。

SQL> select USERNAME,DEFAULT_TABLESPACE,TEMPORARY_TABLESPACE from dba_users where username = 'hr'; 查看用户对应的默认表空间

修改用户默认表空间

SQL> alter user zhanghr default tablespace test;

设置数据库的默认临时表空间:

SQL>Alter database default temporary tablespace temp_tbs_name;

查看用户和默认表空间的关系:

SQL>select username,default_tablespace from dba_users;

查看临时表空间:

SQL> select file_name,file_id,blocks,user_blocks from dba_temp_files;

SQL> select tablespace_name,current_users,total_blocks,used_blocks,free_blocks from v$sort_segment;

查看undo表空间

SQL> show parameter undo;

NAME TYPE VALUE

------------------------------------ ----------- ------------------------------

undo_management string AUTO

undo_retention integer 900

undo_tablespace string UNDOTBS1

查看undo表空间大小

SQL> select sum(bytes)/1024/1024 "current undo size(M)" from dba_data_files where tablespace_name='UNDOTBS1';

通过增加数据文件来改变undo表空间大小

SQL> alter tablespace undotbs1

add datafile '/oracle/oradata/orc6/undo02.dbf' size 10M;

通过resize更改数据文件大小

SQL> alter database datafile '/oracle/oradata/orc6/undo02.dbf' resize 100M;

查看某个表空间的数据文件

SQL> select file_name,tablespace_name,bytes/1024/1024 "bytes MB",maxbytes/1024/1024 "maxbytes MB" from dba_data_files where tablespace_name='ORA1TBS';指定表空间名要大写

查看所有表空间大小

SQL> select tablespace_name,sum(bytes)/1024/1024 from dba_data_files

group by tablespace_name;

查看已使用的表空间大小

SQL> select tablespace_name,sum(bytes)/1024/1024 from dba_free_space

group by tablespace_name;

oracle查看表空间大小及使用率:

方法一:

SELECT UPPER(F.TABLESPACE_NAME),D.TOT_GROOTTE_MB,D.TOT_GROOTTE_MB,F.TOTAL_BYTES,TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100, 2),'990.99'), F.TOTAL_BYTES, F.MAX_BYTES FROM (SELECT TABLESPACE_NAME,ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_BYTES FROM SYS.DBA_FREE_SPACE GROUP BY TABLESPACE_NAME) F,(SELECT DD.TABLESPACE_NAME,ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB FROM SYS.DBA_DATA_FILES DD GROUP BY DD.TABLESPACE_NAME) D WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME ORDER BY 4 DESC;

方法二:

SELECT D.TABLESPACE_NAME,

SPACE || 'M' "SUM_SPACE(M)",

BLOCKS "SUM_BLOCKS",

SPACE - NVL (FREE_SPACE, 0) || 'M' "USED_SPACE(M)",

ROUND ( (1 - NVL (FREE_SPACE, 0) / SPACE) * 100, 2) || '%'

"USED_RATE(%)",

FREE_SPACE || 'M' "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

SELECT D.TABLESPACE_NAME,

SPACE || 'M' "SUM_SPACE(M)",

BLOCKS SUM_BLOCKS,

USED_SPACE || 'M' "USED_SPACE(M)",

ROUND (NVL (USED_SPACE, 0) / SPACE * 100, 2) || '%' "USED_RATE(%)",

NVL (FREE_SPACE, 0) || 'M' "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(+)

ORDER BY 1;

方法三:

SELECT *

FROM (SELECT a.tablespace_name,

to_char(a.bytes / 1024 / 1024, '99,999.999') total_bytes,

to_char(b.bytes / 1024 / 1024, '99,999.999') free_bytes,

to_char(a.bytes / 1024 / 1024 - b.bytes / 1024 / 1024,

'99,999.999') use_bytes,

to_char((1 - b.bytes / a.bytes) * 100, '99.99') || '%' USE

FROM (SELECT tablespace_name, SUM(bytes) bytes

FROM dba_data_files

GROUP BY tablespace_name) a,

(SELECT tablespace_name, SUM(bytes) bytes

FROM dba_free_space

GROUP BY tablespace_name) b

WHERE a.tablespace_name = b.tablespace_name

UNION ALL

SELECT c.tablespace_name,

to_char(c.bytes / 1024 / 1024, '99,999.999') total_bytes,

to_char((c.bytes - d.bytes_used) / 1024 / 1024, '99,999.999') free_bytes,

to_char(d.bytes_used / 1024 / 1024, '99,999.999') use_bytes,

to_char(d.bytes_used * 100 / c.bytes, '99.99') || '%' USE

FROM (SELECT tablespace_name, SUM(bytes) bytes

FROM dba_temp_files

GROUP BY tablespace_name) c,

(SELECT tablespace_name, SUM(bytes_cached) bytes_used

FROM v$temp_extent_pool

GROUP BY tablespace_name) d

WHERE c.tablespace_name = d.tablespace_name)

ORDER BY tablespace_name;

查看表空间使用大小情况一

SQL> 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

;

TABLESPACE_NAME Sum MB used MB free MB percent_used

------------------------------ ---------- ---------- ---------- ------------

SYSAUX 490 461.0625 28.9375 94.09

UNDOTBS1 75 66.8125 8.1875 89.08

USERS 5 1.3125 3.6875 26.25

ORA1TBS 400 2 398 .5

ORA2TBS 400 2 398 .5

查看表空间使用大小情况二

SQL> select a.tablespace_name,total,free,total-free used from

2 ( select tablespace_name,sum(bytes)/1024/1024 total from dba_data_files

group by tablespace_name) a,

( select tablespace_name,sum(bytes)/1024/1024 free from dba_free_space

group by tablespace_name) b

where a.tablespace_name=b.tablespace_name; 3 4 5 6

TABLESPACE_NAME TOTAL FREE USED

------------------------------ ---------- ---------- ----------

USERS 5 .9375 4.0625

TESTTB 500 499 1

SYSAUX 550 30 520

EXAMPLE 100 20.75 79.25

UNDOTBS1 110 96.625 13.375

在SQL命令行情况下将结果输出到指定文件中。

SQL> spool out.txt

SQL> select * from v$database;

SQL> spool off

三、查看、管理ORACLE数据文件

查看数据文件:

SQL> select name from v$datafile;

更改数据文件大小:

SQL> alter database datafile '/oradata2/hisvhfs/undotbs01.dbf' resize 30G;

查看用户所有表空间及对应的数据文件和数据文件大小

SQL> select tablespace_name, file_id, file_name, round(bytes/(1024*1024),0) total_space from dba_data_files order by tablespace_name;

查看数据文件状态及大小

SQL> select name,BYTES,STATUS ,FILE# from v$datafile;

查看所有数据文件

SQL> select name from v$datafile;

查看所有表空间对应的数据文件

SQL> select tablespace_name, file_id, file_name, round(bytes/(1024*1024),0) total_space from dba_data_files order by tablespace_name;

四、查看、管理ORACLE表

查看所有segment的大小。

Select Segment_Name,Sum(bytes)/1024/1024 From User_Extents Group By Segment_Name

查询表的大小和表空间的大小

或者

SQL> Select Segment_Name,Sum(bytes)/1024/1024 From User_Extents Group By Segment_Name;

SEGMENT_NAME SUM(BYTES)/1024/1024

-------------------------------------------------------------------------------- --------------------

DEPT 0.0625

PK_DEPT 0.0625

EMP 0.0625

DEPT_COPY 0.0625

DEPT_COPY2 0.0625

ITEMS 0.0625

PK_EMP 0.0625

SALGRADE 0.0625

8 rows selected

另一种表实际使用的空间。这样查询:

SQL> select table_name from user_tables;

TABLE_NAME

------------------------------

DEPT

EMP

BONUS

SALGRADEanalyze table emp compute statistics;

ITEMS

DEPT_COPY

DEPT_COPY2

SQL> analyze table DEPT_COPY2 compute statistics;

查看某个表属于哪个表空间:

SQL> select tablespace_name from all_tables where table_name='SYS_EXPORT_FULL_01';

创建表时指定表空间:

SQL>create table a (name varchar(10)) tablespace test;

查看数据库表结构:

SQL> desc dept_copy2;

Name Type Nullable Default Comments

------ ------------ -------- ------- --------

DEPTNO NUMBER(2) Y

DNAME VARCHAR2(14) Y

LOC VARCHAR2(13) Y

修改表的列名:

SQL> alter table users rename column ID to PID;

修改表的列的字符大小

SQL> alter table student modify class varchar2(10);

创建主键:

SQL> alter table users add constraint pk_users primary key(name);

修改表的列数据类型:

SQL> select * from users;

NAME AGE PID

---------- ---------- ----------

赵霞 3.2012E+18

李莉 3.2012E+18

SQL> alter table users add(newColumn varchar2(20));

SQL> update users set newColumn = PID;

SQL> commit;

SQL> alter table users drop column PID cascade constraints;

SQL> alter table users rename column newColumn to PID;

SQL> commit;

SQL> desc users;

名称 是否为空? 类型

----------------------------------------- -------- ----------------------------

NAME NOT NULL VARCHAR2(10)

AGE NUMBER

PID VARCHAR2(20)

SQL> select * from users;

NAME AGE PID

---------- ---------- --------------------

赵霞 3201231988001010101

李莉 3201231988001010102

创建序列:

SQL> create sequence seq_PID

start with 3201231988001010101

maxvalue 3201231999999999999

minvalue 3201231988001010101

nocycle

cache 100;

创建触发器:

SQL> create or replace trigger trigger_users

before insert on users

for each row

begin

select seq_PID.nextval into :new.PID from dual;

end;

/

查看用户序列

SQL> select sequence_name from USER_SEQUENCES;

SEQUENCE_NAME

------------------------------

SEQ_ID

查看用户触发器

SQL> select * from user_triggers where table_name = upper('job');

通过group by 语句使用rollup运算符汇总ID列

SQL> select ID,avg(age),sum(age),max(age),count(*)

2 from job group by rollup(ID);

ID AVG(AGE) SUM(AGE) MAX(AGE) COUNT(*)

---------- ---------- ---------- ---------- ----------

1583 25 25 25 1

1584 24 24 24 1

1585 25 25 25 1

1586 25 25 25 1

1587 23 23 23 1

1683 22 22 22 1

1684 24 24 24 1

1685 25 25 25 1

1686 24 24 24 1

1687 22 22 22 1

1688 28 28 28 1

ID AVG(AGE) SUM(AGE) MAX(AGE) COUNT(*)

---------- ---------- ---------- ---------- ----------

1689 26 26 26 1

1690 26 26 26 1

1783 35 35 35 1

1784 1

1883 24 24 24 1

1884 1

25.2 378 35 17

having子句与group by 子句一般一起使用,可以在汇总相关数据后进一步筛选汇总的数据。

SQL> select ID,avg(age),sum(age),max(age),count(*)

2 from job group by id having avg(age)>25;

ID AVG(AGE) SUM(AGE) MAX(AGE) COUNT(*)

---------- ---------- ---------- ---------- ----------

1690 26 26 26 1

1783 35 35 35 1

1689 26 26 26 1

1688 28 28 28 1

多表连接查询

SQL> select job.name,job.id,job.job,job.age,users.name,users.age from job,users

2 where job.name=users.name;

NAME ID JOB AGE NAME AGE

-------- ---------- ---------- ---------- ---------- ----------

陈灵灵 1783 KTV服务员 35 陈灵灵 38

李莉 1587 IT程序员 23 李莉

赵霞 1683 空姐 22 赵霞

desc 在oracle数据库里有两种用法,一是查询表的结构 格式:desc table_name

二是在用排序时(order by)是降序的关键字 格式 :order by column_name desc;

查看表的segment大小,即表实际占用的物理大小,无论是否使用。

SQL> select segment_name,partition_name,bytes,blocks,extents from user_segments where segment_name='JOBS'; (segment名,即表明)

SQL> select segment_name,partition_name,count(extent_id),sum(bytes),sum(blocks) from user_extents where segment_name='JOBS' group by segment_name,partition_name;

五、查看、管理ORACLE常用的参数、配置等

查看控制文件:

SQL> select name from v$controlfile;

查看重做日志文件,简称日志文件:

SQL> select * from v$logfile;

查看表的索引:

SQL>select index_name,index_type,table_name from user_indexes where table_name='表名';

修改oracle时间格式:

SQL> alter session set nls_date_format='YYYY-MM-DD HH24:MI:SS';

指定开启某个监听:

SQL>lsnrctl start orc5_lisenter(此处是当初建监听时创建的监听名)

数据库SCN及时间查询。

SQL> select sysdate from dual; 查看数据库时间

SYSDATE

-----------------

20131216 23:52:55

SQL> select dbms_flashback.get_system_change_number from dual; 查看当前数据库的SCN号

GET_SYSTEM_CHANGE_NUMBER

------------------------

1583042

SQL> select to_char(scn_to_timestamp(1583042),'yyyy-mm-dd hh24:mi:ss') from dual; 根据数据库的SCN号查找对应的数据库时间

TO_CHAR(SCN_TO_TIME

-------------------

2013-12-16 23:45:38

SQL> select timestamp_to_scn(to_date('2013-12-16 15:30:19','yyyy-mm-dd hh24:mi:ss')) from dual; 根据数据库的时间查找对应的数据库SCN号

TIMESTAMP_TO_SCN(TO_DATE('2013-12-1615:30:19','YYYY-MM-DDHH24:MI:SS'))

----------------------------------------------------------------------

1519388

SQL> select * from (select time_dp,scn from smon_scn_time order by time_dp desc)where rownum

TIME_DP SCN

----------------- ----------

20131216 15:53:02 1584574

20131216 15:46:45 1583098

20131216 15:45:20 1583022

20131216 15:39:08 1582399

20131216 15:37:01 1581998

20131216 15:31:08 1579915

20131216 14:46:02 1577210

20131216 14:40:16 1576196

20131216 14:35:12 1575597

9 rows selected.

数据库游标设置

SQL> show parameter open_cursors; 查看游标参数

SQL> select count(*) from v$open_cursor; 查看打开的游标

SQL> select name,value from v$sysstat where name ='opened cursors current';查看当前打开的游标

SQL> alter system set open_cursors=3000 scope=both; 修改默认游标数

六、查看、配置ORACLE重做日志

创建日志文件组:

SQL> alter database add logfile group 4

(

'/oracle/oradata/orc6/redo04.log'

)

size 10M;

查看日志文件组

SQL> select group#,status,member from v$logfile;

为日志文件组增加日志文件:

SQL> alter database add logfile member '/oracle/oradata/orc6/redo05.log' to group 3;

查看日志文件大小

SQL> select GROUP#,BYTES,BLOCKSIZE,MEMBERS from v$log;

七、desc的常用查询

SQL> desc dba_temp_files; 查询临时表空间

SQL> desc v$database; 查看数据库

SQL> desc dba_data_files; 查看数据文件

SQL> desc user_segments; 查看oracle segment(段)

SQL> desc dba_segments; 查看ORACLE segment

SQL> desc dba_tables; 查看表

SQL> desc dba_objects 查看对象

SQL> desc dba_users; 查看用户

SQL> desc dba_tablespaces; 查看表空间

SQL> desc user_segments; 查看数据段

SQL> desc dba_jobs; 查看job

SQL> desc dba_role_privs; 查看角色权限

SQL> desc dba_constraints 查看约束

SQL> desc dba_cons_columns 查看列约束

SQL> show parameter log_archive_dest; 查看archive log所在位置

SQL> archive log list; 查看归档目录以及log sequence

SQL> select * from V$FLASH_RECOVERY_AREA_USAGE; 查看flash_recovery_area 使用情况。

SQL> select sum(percent_space_used)*3/100 from v$flash_recovery_area_usage; 计算flash_recovery_area已经占用的空间。

SQL> show parameter recover; 查找recovery目录

SQL> desc v$process 通过v$process视图,我们获的是当前系统中所有进程信息,包括“后台进程”,也包括“服务器进程”。

SQL> select addr, program from v$process;

SQL> desc v$bgprocess 通过v$bgprocess视图,我们获得当前系统中启动的Oracle“后台进程”信息

SQL> select paddr, name from v$bgprocess where paddr'00';

通过v$bgprocess.paddr与v$process.addr关联起来的,关联后查询结果显而易见只会有Oracle“后台进程”的信息

SQL> select a.paddr, a.name, a.description from v$bgprocess a, v$process b where a.paddr=b.addr;

八、查看ASM磁盘组信息

SQL> desc v$asm_disk;

SQL> desc v$asm_diskgroup;

九、常用SQL命令行设置

1、set

set wrap on/off 查询返回的纪录每行超过默认宽度时,可选择换行(on )或不换行(off),默认为换行;

set linesize N 设置查询返回的纪录每行的宽度,超过这个宽度则截掉,不过这个宽度则补空格。

  • 发表于:
  • 原文链接http://kuaibao.qq.com/s/20171221B0AEIN00?refer=cp_1026
  • 腾讯「腾讯云开发者社区」是腾讯内容开放平台帐号(企鹅号)传播渠道之一,根据《腾讯内容开放平台服务协议》转载发布内容。
  • 如有侵权,请联系 cloudcommunity@tencent.com 删除。

扫码

添加站长 进交流群

领取专属 10元无门槛券

私享最新 技术干货

扫码加入开发者社群
领券