--查詢表空間使用情況　
SELECT UPPER(F.TABLESPACE_NAME) "表空間名",
　　D.TOT_GROOTTE_MB "表空間大小(G)",
　　D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空間(G)",
　　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(G)",
　　F.MAX_BYTES "最大塊(G)"
　　FROM (SELECT TABLESPACE_NAME,
　　ROUND(SUM(BYTES) / (1024 * 1024 * 1024), 2) TOTAL_BYTES,
　　ROUND(MAX(BYTES) / (1024 * 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 * 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;

--查詢表空間的free space
select tablespace_name,
　　count(*) as extends,
　　round(sum(bytes) / 1024 / 1024 /1024, 2) as GB,
　　sum(blocks) as blocks
　　from dba_free_space
　　group by tablespace_name;

--查詢表空間的總?cè)萘?br /> select tablespace_name, sum(bytes) / 1024 / 1024 /1024 as "大小（GB）"
　　from dba_data_files
　　group by tablespace_name;

--查詢表空間使用率
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;

-監(jiān)控當(dāng)前數(shù)據(jù)庫誰在運(yùn)行什么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;

--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;

--查看死鎖信息
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;
?
?
--查詢當(dāng)前連接會話數(shù)
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;

--等待最多的用戶
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;

--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;

--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;

--查看某條SQL語句的資源消耗
SELECT hash_value, buffer_gets, disk_reads, executions, parse_calls
FROM V$SQLAREA
WHERE hash_Value = 228801498 AND address = hextoraw('CBD8E4B0');

--查詢會話執(zhí)行的實(shí)際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;

--顯示正在等待鎖的所有會話
SELECT * FROM DBA_WAITERS;

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