表空間使用情況：

SELECT UPPER(F.TABLESPACE_NAME) "表空間名",D.TOT_GROOTTE_MB "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_BYTESFROM SYS.DBA_FREE_SPACEGROUP BY TABLESPACE_NAME) F,(SELECT DD.TABLESPACE_NAME,ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MBFROM SYS.DBA_DATA_FILES DDGROUP BY DD.TABLESPACE_NAME) DWHERE D.TABLESPACE_NAME = F.TABLESPACE_NAMEORDER BY 1;

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查詢表空間的free space：

select tablespace_name,count(*) as extends,round(sum(bytes) / 1024 / 1024, 2) as MB,sum(blocks) as blocksfrom dba_free_spacegroup by tablespace_name;

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?查詢表空間的總?cè)萘?#xff1a;

select tablespace_name, sum(bytes) / 1024 / 1024 as MBfrom dba_data_filesgroup by tablespace_name;

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?查詢表空間的使用率：

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_Pctfrom (select tablespace_name, sum(bytes) / 1024 / 1024 as MBfrom dba_free_spacegroup by tablespace_name) free,(select tablespace_name, sum(bytes) / 1024 / 1024 as MBfrom dba_data_filesgroup by tablespace_name) totalwhere free.tablespace_name = total.tablespace_name;

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監(jiān)控ORACLE用戶SQL運行情況：

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

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找使用CPU多的用戶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;

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查看死鎖信息：

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SELECT (SELECT usernameFROM v$sessionWHERE SID = a.SID) blocker, a.SID, 'is blocking',(SELECT usernameFROM v$sessionWHERE SID = b.SID) blockee, b.SIDFROM v$lock a, v$lock bWHERE a.BLOCK = 1 AND b.request > 0 AND a.id1 = b.id1 AND a.id2 = b.id2;

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查詢當前連接會話數(shù)：

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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;

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查看消耗資源最多的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;

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查看某條SQL語句的資源消耗：

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

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查詢會話執(zhí)行的實際SQL：

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SELECT a.SID, a.username, s.sql_textFROM v$session a, v$sqltext sWHERE a.sql_address = s.addressAND a.sql_hash_value = s.hash_valueAND a.status = 'ACTIVE' ORDER BY a.username, a.SID, s.piece;

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顯示正在等待鎖的所有會話：

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SELECT * FROM DBA_WAITERS;

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總結(jié)

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