oracle常用状态查询

查看被锁的表

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

查看连接的进程

SELECT sid, serial#, username, osuser FROM v$session;

杀掉进程

alter system kill session 'sid,serial#';

查看当前用户下表的占用空间

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

查询所有对象占用空间

 select  owner, segment_name,sum(bytes/1024/1024)   from   dba_segments  
  group by owner,segment_name

查询数据库中各对象占用空间大小
Select Segment_Name,b.object_type, Sum(bytes)/1024/1024 From User_Extents a,user_objects b
where a.segment_name=b.object_name Group By Segment_Name,b.object_type  order by object_type, Segment_Name

 

 oracle 中去除字段中的回车符
update ywj_yxglobj set table_name = replace(table_name,chr(10),'')
where table_name like 'ACCT_INFO%'

　ASCII()
　　c1是一字符串，返回c1第一个字母的ASCII码，他的逆函数是CHR()
SELECT ASCII('A') BIG_A,ASCII('z') BIG_z FROM empBIG_A BIG_z65 122

　　CHR(＜i＞)[NCHAR_CS]
　　i是一个数字，函数返回十进制表示的字符
select CHR(65),CHR(122),CHR(223) FROM empCHR65 CHR122 CHR223A z B

如何查出UNDO中的空间是被哪个session占用的?

 
SELECT  r.name 回滚段名,                                           
    s.sid,                                                           
    s.serial#,                                                       
    s.username 用户名,                                               
    s.status,                                                        
  s.SQL_ADDRESS,                                                   
  t.cr_get,                                                        
    t.phy_io,                                                        
    t.used_ublk,                                                     
    t.noundo,                                                        
    substr(s.program, 1, 78) 操作程序                                
FROM   sys.v_$session s,sys.v_$transaction t,sys.v_$rollname r     
WHERE  t.addr = s.taddr and t.xidusn = r.usn

查看表空间的名称及大小

　　select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size
　　from dba_tablespaces t, dba_data_files d
　　where t.tablespace_name = d.tablespace_name
　　group by t.tablespace_name;

查看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;

查看回滚段名称及大小

　　select segment_name, tablespace_name, r.status,
　　(initial_extent/1024) InitialExtent,(next_extent/1024) NextExtent,
　　max_extents, v.curext CurExtent
　　From dba_rollback_segs r, v$rollstat v
　　Where r.segment_id = v.usn(+)
　　order by segment_name ;

查看控制文件

　　select name from v$controlfile;

查看日志文件

　　select member from v$logfile;
查看表空间的使用情况

　　select sum(bytes)/(1024*1024) as free_space,tablespace_name
　　from dba_free_space
　　group by tablespace_name;

　　SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,
　　(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE"
　　FROM SYS.SM$TS_AVAIL A,SYS.SM$TS_USED B,SYS.SM$TS_FREE C
　　WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME AND A.TABLESPACE_NAME=C.TABLESPACE_NAME;

查看数据库库对象

　　select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;

查看数据库的版本　

　　Select version FROM Product_component_version
　　Where SUBSTR(PRODUCT,1,6)='Oracle';

查看数据库的创建日期和归档方式

　　Select Created, Log_Mode, Log_Mode From V$Database;

查询数据库中索引占用表空间的大小

select a.segment_name,a.tablespace_name,b.table_name,a.bytes/1024/1024 mbytes,a.blocks
  from user_segments a, user_indexes b
 where a.segment_name = b.index_name
   and a.segment_type = 'INDEX'              --索引
   and a.tablespace_name='APPINDEX'          --表空间
   and b.table_name like '%PREP%'            --索引所在表
   order by table_name,a.bytes/1024/1024 desc