Oracle常用SQL

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--查詢資料表空間使用方式　　SELECT UPPER(F.TABLESPACE_NAME) "資料表空間名",　　D.TOT_GROOTTE_MB "資料表空間大小(M)",　　D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空間(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 "空閑空間(M)",　　F.MAX_BYTES "最大塊(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;　　--查詢資料表空間的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;　　--查詢資料表空間的總容量　　select tablespace_name, sum(bytes) / 1024 / 1024 as MB　　from dba_data_files　　group by tablespace_name;　　--查詢資料表空間使用率　　select total.tablespace_name,　　round(total.MB, 2) as Total_MB,考試大論壇　　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.尋找當前表級鎖的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.殺掉鎖表進程：alter system kill session ‘436,35123‘;3.RAC環境中鎖尋找：SELECT inst_id,DECODE(request,0,‘Holder: ‘,‘Waiter: ‘)||sid sess, id1, id2, lmode, request, type,block,ctimeFROM GV$LOCKWHERE (id1, id2, type) IN (SELECT id1, id2, type FROM GV$LOCK WHERE request>0)ORDER BY id1, request; 4.監控當前資料庫誰在運行什麼SQL語句 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多的使用者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$sesstat c where c.statistic#=12 and c.sid=a.sid and a.paddr=b.addr order by value desc;6.查看死結資訊SELECT (SELECT username FROM v$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$lock b WHERE a.BLOCK = 1 AND b.request > 0 AND a.id1 = b.id1 AND a.id2 = b.id2;7.具有最高等待的對象SELECT o.OWNER,o.object_name, o.object_type, a.event, SUM (a.wait_time + a.time_waited) total_wait_time FROM v$active_session_history a, dba_objects o WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE AND a.current_obj# = o.object_idGROUP BY o.OWNER,o.object_name, o.object_type, a.eventORDER 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.SIDGROUP BY o.owner, o.object_name, o.object_type, a.event, a.session_id, s.program, s.machine, s.osuserORDER BY total_wait_time DESC; 8.查詢當前串連會話數select s.value,s.sid,a.usernamefrom v$sesstat S,v$statname N,v$session Awhere n.statistic#=s.statistic# andname=‘session pga memory‘and s.sid=a.sidorder by s.value; 9.等待最多的使用者SELECT s.SID, s.username, SUM (a.wait_time + a.time_waited) total_wait_time FROM v$active_session_history a, v$session s WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATEGROUP BY s.SID, s.usernameORDER BY total_wait_time DESC; 10.等待最多的SQLSELECT a.program, a.session_id, a.user_id, d.username, s.sql_text, SUM (a.wait_time + a.time_waited) total_wait_time FROM v$active_session_history a, v$sqlarea s, dba_users d WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE AND a.sql_id = s.sql_id AND a.user_id = d.user_idGROUP BY a.program, a.session_id, a.user_id, s.sql_text, d.username; 11.查看消耗資源最多的SQLSELECT hash_value, executions, buffer_gets, disk_reads, parse_callsFROM V$SQLAREAWHERE buffer_gets > 10000000 OR disk_reads > 1000000ORDER BY buffer_gets + 100 * disk_reads DESC; 12.查看某條SQL語句的資源消耗SELECT hash_value, buffer_gets, disk_reads, executions, parse_callsFROM V$SQLAREAWHERE hash_Value = 228801498 AND address = hextoraw(‘CBD8E4B0‘);13.查詢會話執行的實際SQLSELECT a.SID, a.username, s.sql_text FROM v$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.顯示正在等待鎖的所有會話SELECT * FROM DBA_WAITERS;

Oracle常用SQL