Oracle查询表空间使用情况

--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;

　　--查询表空间使用率
　　select total.tablespace_name,
　　round(total.MB, 2) as Total_MB,考试大论坛
　　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;

 

 

1.查找当前表级锁的SQL如下： select sess.sid,      sess.serial#,      lo.oracle_username,      lo.os_user_name,      ao.object_name,      lo.locked_mode      from v$locked_object lo,      dba_objects ao,      v$session sess  where ao.object_id = lo.object_id and lo.session_id = sess.sid;

2.杀掉锁表进程： alter system kill session '436,35123';

3.RAC环境中锁查找： SELECT inst_id,DECODE(request,0,'Holder: ','Waiter: ')||sid sess,          id1, id2, lmode, request, type,block,ctime FROM GV$LOCK WHERE (id1, id2, type) IN        (SELECT id1, id2, type FROM GV$LOCK WHERE request>0) ORDER BY id1, request;   

4.监控当前数据库谁在运行什么SQL语句  select osuser, username, sql_text   from  v$session a, v$sqltext b  where  a.sql_address =b.address order by address, piece;

5.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;

6.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;

7.具有最高等待的对象 SELECT   o.OWNER,o.object_name, o.object_type, a.event,          SUM (a.wait_time + a.time_waited) total_wait_time     FROM v$active_session_history a, dba_objects o    WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE      AND a.current_obj# = o.object_id GROUP BY o.OWNER,o.object_name, o.object_type, a.event ORDER BY total_wait_time DESC;

SELECT   a.session_id, s.osuser, s.machine, s.program, o.owner, o.object_name,          o.object_type, a.event,          SUM (a.wait_time + a.time_waited) total_wait_time     FROM v$active_session_history a, dba_objects o, v$session s    WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE      AND a.current_obj# = o.object_id      AND a.session_id = s.SID GROUP BY o.owner,          o.object_name,          o.object_type,          a.event,          a.session_id,          s.program,          s.machine,          s.osuser ORDER BY total_wait_time DESC;

8.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;

9.等待最多的用户 SELECT   s.SID, s.username, SUM (a.wait_time + a.time_waited) total_wait_time     FROM v$active_session_history a, v$session s    WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE GROUP BY s.SID, s.username ORDER BY total_wait_time DESC;

10.等待最多的SQL SELECT   a.program, a.session_id, a.user_id, d.username, s.sql_text,          SUM (a.wait_time + a.time_waited) total_wait_time     FROM v$active_session_history a, v$sqlarea s, dba_users d    WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE      AND a.sql_id = s.sql_id      AND a.user_id = d.user_id GROUP BY a.program, a.session_id, a.user_id, s.sql_text, d.username;

11.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;

12.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');

13.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;

14.显示正在等待锁的所有会话 SELECT * FROM DBA_WAITERS;