oracle¼ì²âËø£¬ÊÍ·ÅËø
¼ì²âËø£º
SELECT A.OWNER,
A.OBJECT_NAME,
B.XIDUSN,
B.XIDSLOT,
B.XIDSQN,
B.SESSION_ID,
B.ORACLE_USERNAME,
B.OS_USER_NAME,
B.PROCESS,
B.LOCKED_MODE,
C.MACHINE,
C.STATUS,
C.SERVER,
C.SID,
C.SERIAL#,
C.PROGRAM
from ALL_OBJECTS A,
V$LOCKED_OBJECT B,
SYS.GV_$SESSION C
WHERE ( A.OBJECT_ID = B.OBJECT_ID )
AND (B.PROCESS = C.PROCESS )
ORDER BY 1,2;
ɱËÀsessionÊÍ·ÅËø£º
alter system kill session 'sid, serial#'
Ïà¹ØÎĵµ£º
OracleÖеÄHash JoinÏé½â
Ò»¡¢ hash join¸ÅÄî
Hashjoin(HJ)ÊÇÒ»ÖÖÓÃÓÚequi-join£¨¶øanti-join¾ÍÊÇʹÓÃNOT INʱµÄjoin£©µÄ¼¼Êõ¡£
ÔÚOracleÖУ¬ËüÊÇ´Ó7.3¿ªÊ¼ÒýÈëµÄ£¬ÒÔ´úÌæsort-mergeºÍnested-loop join·½Ê½£¬
Ìá¸ßЧÂÊ¡£ÔÚCBO£¨hash joinÖ»ÓÐÔÚCBO²Å¿ÉÄܱ»Ê¹Óõ½£©Ä£Ê½Ï£¬ÓÅ»¯Æ÷¼ÆËã´ú ......
Oracle ·ÖÇø±í
OracleÌṩÁË·ÖÇø¼¼ÊõÒÔÖ§³ÖVLDB(Very Large DataBase)¡£·ÖÇø±íͨ¹ý¶Ô·ÖÇøÁеÄÅжϣ¬°Ñ·ÖÇøÁв»Í¬µÄ¼Ç¼£¬·Åµ½²»Í¬µÄ·ÖÇøÖС£·ÖÇøÍêÈ«¶ÔÓ¦ÓÃ͸Ã÷¡£
OracleµÄ·ÖÇø±í¿ÉÒÔ°üÀ¨¶à¸ö·ÖÇø£¬Ã¿¸ö·ÖÇø¶¼ÊÇÒ»¸ö¶ÀÁ¢µÄ¶Î£¨SEGMENT£©£¬¿ÉÒÔ´æ·Åµ½²»Í¬µÄ±í¿Õ¼äÖС£²éѯʱ¿ÉÒÔͨ¹ý²éѯ±íÀ´·ÃÎʸ÷¸ö·ÖÇøÖеÄÊý¾Ý£ ......
OracleÖÐÁÙʱ±í²úÉú¹ýÁ¿RedoµÄ˵Ã÷
×î½ü,ÔÚOracle9iÖÐÄãÓùýÁÙʱ±íÂð?
ËüÊÇ·ñ¸øÄã´øÀ´ÁËÐÔÄÜÌá¸ß?Äã×¢Òâ¹ýô?
--------------------------------------------------------------------------------
ºÃÁËÑÔ¹éÕý´«.
ÎÒÃÇÖªµÀÁÙʱ±íÔÚDML²Ù×÷ÖпÉÒÔ¼õÉÙredoµÄÉú³É,´Ó¶øÔÚ±£´æÖмä½á¹û¼¯Ê±¿ÉÒÔ´øÀ´½Ï´óµÄÐÔÄÜÌá¸ß.
¿ÉÊÇ,È ......
1¡¢²é¿´ORACLE×î´óÓαêÊý
C:\Documents and Settings\Administrator>sqlplus "sys/admin@test151 as sysdba" £¨sysÒÔdbaµÇ¼test151·þÎñ£©
SQL*Plus: Release 9.2.0.1.0 - Production on ÐÇÆÚËÄ 11ÔÂ 5 09:08:04 2009
Copyright (c) 1982, 2002, Oracle Corporation. All rights ......
ÔÚÖ´ÐÐÆô¶¯¹Ø±ÕÃüÁî֮ǰÐèÒªÕýÈ·ÉèÖÃÏÂÁл·¾³±äÁ¿£º
ORACLE_BASE
ORACLE_HOME °²×°¹ý³ÌÖÐÏÔʾµÄoracle home Ŀ¼
ORACLE_SID
PATH=$PAHT£º$ORACLE_HOME/bin
ÒÔ oracle Õ˺ŵǽ Linux£¬»òÕß´Ó root ÏÂÊäÈë su - or ......