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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_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_userswhere 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,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,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,F.TOTAL_BYTES,TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,2),'990.99'),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,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, 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, SUM (BLOCKS) BLOCKS FROM DBA_TEMP_FILES GROUP BY TABLESPACE_NAME) D, 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 / 1024,999.999') 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, to_char((c.bytes - d.bytes_used) / 1024 / 1024, to_char(d.bytes_used / 1024 / 1024, to_char(d.bytes_used * 100 / c.bytes,SUM(bytes) bytes FROM dba_temp_files GROUP BY tablespace_name) c,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$datafile;
更改数据文件大小:
SQL> alter database datafile '/oradata2/hisvhfs/undotbs01.dbf' resize 30G;
查看用户所有表空间及对应的数据文件和数据文件大小
SQL> select tablespace_name,round(bytes/(1024*1024),0) total_space from dba_data_files order by tablespace_name;
查看数据文件状态及大小
SQL> select name,BYTES,STATUS,FILE# from v$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,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
有两种含义的表大小。一种是分配给一个表的物理空间数量,而不管空间是否被使用。可以这样查询获得字节数: 当前实例以scott用户登录,并创建dept表的副本dept_copy2为例。 SQL> select segment_name,bytes 2 from user_segments 3 where segment_type = 'TABLE'; SEGMENT_NAME BYTES -------------------------------------------------------------------------------- ---------- DEPT_COPY2 65536 DEPT_COPY 65536 BIN$7Sa/taXJEKHgQ2kFqMCxMQ==$0 65536 ITEMS 65536 SALGRADE 65536 EMP 65536 DEPT 65536 7 rows selected
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,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,extents from user_segments where segment_name='JOBS'; (segment名,即表明) SQL> select segment_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$logfile;
查看表的索引: SQL>select index_name,index_type,table_name from user_indexes where table_name='表名';
修改oracle时间格式: SQL> alter session set nls_date_format='YYYY-MM-DD HH24:MI:SS';
指定开启某个监听: SQL>lsnrctl start orc5_lisenter(此处是当初建监听时创建的监听名)
数据库SCN及时间查询。
SQL> select sysdate from dual; 查看数据库时间
SYSDATE ----------------- 20131216 23:52:55
SQL> select dbms_flashback.get_system_change_number from dual; 查看当前数据库的SCN号
GET_SYSTEM_CHANGE_NUMBER ------------------------ 1583042
SQL> select to_char(scn_to_timestamp(1583042),'yyyy-mm-dd hh24:mi:ss') from dual; 根据数据库的SCN号查找对应的数据库时间
TO_CHAR(SCN_TO_TIME ------------------- 2013-12-16 23:45:38
SQL> select timestamp_to_scn(to_date('2013-12-16 15:30:19','yyyy-mm-dd hh24:mi:ss')) from dual; 根据数据库的时间查找对应的数据库SCN号
TIMESTAMP_TO_SCN(TO_DATE('2013-12-1615:30:19','YYYY-MM-DDHH24:MI:SS')) ---------------------------------------------------------------------- 1519388
SQL> select * from (select time_dp,scn from smon_scn_time order by time_dp desc)where rownum<10;条件查找,查找rownum小于10的SCN以对应的时间。
TIME_DP SCN ----------------- ---------- 20131216 15:53:02 1584574 20131216 15:46:45 1583098 20131216 15:45:20 1583022 20131216 15:39:08 1582399 20131216 15:37:01 1581998 20131216 15:31:08 1579915 20131216 14:46:02 1577210 20131216 14:40:16 1576196 20131216 14:35:12 1575597
9 rows selected.
数据库游标设置
SQL> show parameter open_cursors; 查看游标参数 SQL> select count(*) from v$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#,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。
--查看用户分区
select * from user_tab_partitions
exp c##zhangzhou_ibm/zhangzhou_ibm file=d:/t.dmp tables=t_position:p1
select count(*) from v$session;
select * from v$instance
select username,count(username) from v$session where username is not null group by username;
--查看用户权限
select * from user_role_privs;
--查看用户表空间
select username,default_tablespace from dba_users where username like '%ZHANGZHOU%';
--导出命令
exp system/Passw0rd tables=p_t1 file='d:exp_table.dmp'
create tablespace test1 datafile 'E:appsaoradataorcltest1.dbf' size 10M;
create user c##test1 identified by test1 default tablespace test1;
grant connect,resource,dba to c##test1;
create table p_t1 (id int,datatime date)
partition by range(datatime)
(partition p1 values less than (to_date('2016-01-01','yyyy-mm-dd')),partition p2 values less than (to_date('2016-02-01',partition p3 values less than (to_date('2016-03-01','yyyy-mm-dd')));
insert into p_t1 values(1,to_date('2016-01-01','yyyy-mm-dd'));
insert into p_t1 values(1,to_date('2015-02-01','yyyy-mm-dd'));
insert into p_t1 values(2,to_date('2016-02-01','yyyy-mm-dd'));
insert into p_t1 values(3,to_date('2016-03-01','yyyy-mm-dd'));
commit;
select * from p_t1 partition(p3)
select tablespace_name,sum(bytes)/1024/1024 from dba_data_files group by tablespace_name;
select SEGMENT_TYPE,owner,sum(bytes)/1024/1024 from dba_segments where tablespace_name='TEST1' group by segment_type,owner
SELECT FILE_NAME,TABLESPACE_NAME,AUTOEXTENSIBLE FROM dba_data_files;
SELECT * FROM dba_data_files;
select tablespace_name,sum(bytes) / 1024 / 1024 from dba_free_space group by tablespace_name;
alter database datafile 'E:appsaoradataorcltest1.dbf' autoextend on;
(编辑:李大同)
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