oracle空间查询

表空间使用情况：

SELECT UPPER(F.TABLESPACE_NAME) "表空间名",
　　D.TOT_GROOTTE_MB "表空间大小(M)",
　　D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
　　TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,2),'990.99') || '%' "使用比",
　　F.TOTAL_BYTES "空闲空间(M)",
　　F.MAX_BYTES "最大块(M)"
　　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 1;

查询表空间的free space：

select tablespace_name,
　　count(*) as extends,
　　round(sum(bytes) / 1024 / 1024, 2) as MB,
　　sum(blocks) as blocks
　　from dba_free_space
　　group by tablespace_name;

查询表空间的总容量：

select tablespace_name, sum(bytes) / 1024 / 1024 as MB
　　from dba_data_files
　　group by tablespace_name;

查询表空间的使用率：

select total.tablespace_name,
　　round(total.MB, 2) as Total_MB,
　　round(total.MB - free.MB, 2) as Used_MB,
　　round((1 - free.MB / total.MB) * 100, 2) || '%' as Used_Pct
　　from (select tablespace_name, sum(bytes) / 1024 / 1024 as MB
　　from dba_free_space
　　group by tablespace_name) free,
　　(select tablespace_name, sum(bytes) / 1024 / 1024 as MB
　　from dba_data_files
　　group by tablespace_name) total
　　where free.tablespace_name = total.tablespace_name;

监控ORACLE用户SQL运行情况：

select osuser, username, sql_text  
from  v$session a, v$sqltext b 
where  a.sql_address =b.address order by address, piece;

找使用CPU多的用户session：

select a.sid,spid,status,substr(a.program,1,40) prog, a.terminal,osuser,value/60/100 value 
from  v$session a,v$process b,v$sesstat c 
where  c.statistic#=12 and  
       c.sid=a.sid and  
       a.paddr=b.addr  
       order by value desc;

查看死锁信息：

SELECT (SELECT username
          FROM v$session
         WHERE SID = a.SID) blocker, a.SID, 'is blocking',
       (SELECT username
          FROM v$session
         WHERE SID = b.SID) blockee, b.SID
  FROM v$lock a, v$lock b
 WHERE a.BLOCK = 1 AND b.request > 0 AND a.id1 = b.id1 AND a.id2 = b.id2;

查询当前连接会话数：

select s.value,s.sid,a.username
from 
v$sesstat S,v$statname N,v$session A
where 
n.statistic#=s.statistic# and
name='session pga memory'
and s.sid=a.sid
order by s.value;

查看消耗资源最多的SQL：

SELECT hash_value, executions, buffer_gets, disk_reads, parse_calls
FROM V$SQLAREA
WHERE buffer_gets > 10000000 OR disk_reads > 1000000
ORDER BY buffer_gets + 100 * disk_reads DESC;

查看某条SQL语句的资源消耗：

SELECT hash_value, buffer_gets, disk_reads, executions, parse_calls
FROM V$SQLAREA
WHERE hash_Value = 228801498 AND address = hextoraw('CBD8E4B0');

查询会话执行的实际SQL：

SELECT   a.SID, a.username, s.sql_text
    FROM v$session a, v$sqltext s
   WHERE a.sql_address = s.address
     AND a.sql_hash_value = s.hash_value
     AND a.status = 'ACTIVE'
ORDER BY a.username, a.SID, s.piece;

显示正在等待锁的所有会话：

SELECT * FROM DBA_WAITERS;

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