ÐÔÄܼà¿ØÖ®¼à¿ØSQLÓï¾ä(ZT)

1.¼à¿Øµ±Ç°Êý¾Ý¿âË­ÔÚÔËÐÐʲôSQLÓï¾ä
SELECT osuser, username, sql_text from v$session a, v$sqltext b
where a.sql_address =b.address order by address, piece;
 
2.·ÖÎö±í
analyze table tablename compute statistics for all indexes;
analyze table tablename compute statistics for all indexed columns;
analyze table tablename compute statistics for table;
3.¼à¿ØÊÂÀýµÄµÈ´ý
select event,sum(decode(wait_Time,0,0,1)) "Prev",
sum(decode(wait_Time,0,1,0)) "Curr",count(*) "Tot"
from v$session_Wait
group by event order by 4;
4.²é¿´ËéƬ³Ì¶È¸ßµÄ±í
SELECT segment_name table_name , COUNT(*) extents
from dba_segments WHERE owner NOT IN (SYS, SYSTEM) GROUP BY segment_name
HAVING COUNT(*) = (SELECT MAX( COUNT(*) from dba_segments GROUP BY segment_name);
5.±í¡¢Ë÷ÒýµÄ´æ´¢Çé¿ö¼ì²é
select segment_name,sum(bytes),count(*) ext_quan from dba_extents where
tablespace_name=&tablespace_name and segment_type=TABLE group by tablespace_name,segment_name;
select segment_name,count(*) from dba_extents where segment_type=INDEX and owner=&owner
group by segment_name;
5.ÕÒʹÓÃCPU¶àµÄÓû§session
12ÊÇcpu used by this session
select a.sid,spid,status,substr(a.program,1,40) prog,a.terminal,osuser,value/60/100 value
from v$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;
6.¼à¿Ø±í¿Õ¼äµÄ I/O ±ÈÀý
select df.tablespace_name name,df.file_name "file",f.phyrds pyr,
f.phyblkrd pbr,f.phywrts pyw, f.phyblkwrt pbw
from v$filestat f, dba_data_files df
where f.file# = df.file_id
order by df.tablespace_name;
7.»Ø¹ö¶ÎµÄÕùÓÃÇé¿ö
select name, waits, gets, waits/gets "Ratio"
from v$rollstat a, v$rollname b
where a.usn = b.usn;
8.ÔÚij¸öÓû§ÏÂÕÒËùÓеÄË÷Òý
select user_indexes.table_name, user_indexes.index_name,uniqueness, column_name
from user_ind_columns, user_indexes
where user_ind_columns.index_name = user_indexes.index_name
and user_ind_columns.table_name = user_indexes.table_name
order by user_indexes.table_typ