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http://tech.it168.com/db/o/2006-06-15/200606151715426.shtml
1.Ñ¡ÓÃÊʺϵÄORACLEÓÅ»¯Æ÷
ORACLEµÄÓÅ»¯Æ÷¹²ÓÐ3ÖÖ:
1.RULE(»ùÓÚ¹æÔò) 2.COST(»ùÓڳɱ¾) 3.CHOOSE(Ñ¡ÔñÐÔ)
ÉèÖÃȱʡµÄÓÅ»¯Æ÷,¿ÉÒÔͨ¹ý¶Ôinit.oraÎļþÖÐOPTIMIZER_MODE²ÎÊýµÄ¸÷ÖÖÉùÃ÷,ÈçRULE,COST,CHOOSE,ALL_ROWS,FIRST_ROWS . Ä㵱ȻҲÔÚSQL¾ä¼¶»òÊǻỰ(session)¼¶¶ÔÆä½øÐи²¸Ç.
ΪÁËʹÓûùÓڳɱ¾µÄÓÅ»¯Æ÷(CBO, Cost-Based Optimizer) , Äã±ØÐë¾³£ÔËÐÐanalyze ÃüÁî,ÒÔÔö¼ÓÊý¾Ý¿âÖеĶÔÏóͳ¼ÆÐÅÏ¢(object statistics)µÄ׼ȷÐÔ.
Èç¹ûÊý¾Ý¿âµÄÓÅ»¯Æ÷ģʽÉèÖÃΪѡÔñÐÔ(CHOOSE),ÄÇôʵ¼ÊµÄÓÅ»¯Æ÷ģʽ½«ºÍÊÇ·ñÔËÐйýanalyzeÃüÁîÓйØ. Èç¹ûtableÒѾ±»analyze¹ý, ÓÅ»¯Æ÷ģʽ½«×Ô¶¯³ÉΪCBO , ·´Ö®,Êý¾Ý¿â½«²ÉÓÃRULEÐÎʽµÄÓÅ»¯Æ÷.
ÔÚȱʡÇé¿öÏÂ,ORACLE²ÉÓÃCHOOSEÓÅ»¯Æ÷, ΪÁ˱ÜÃâÄÇЩ²»±ØÒªµÄÈ«±íɨÃè(full table scan) , Äã±ØÐ뾡Á¿±ÜÃâʹÓÃCHOOSEÓÅ»¯Æ÷,¶øÖ±½Ó²ÉÓûùÓÚ¹æÔò»òÕß»ùÓڳɱ¾µÄÓÅ»¯Æ÷.
2.·ÃÎÊTableµÄ·½Ê½
ORACLE ²ÉÓÃÁ½ÖÖ·ÃÎʱíÖмǼµÄ·½Ê½:
1.È«±íɨÃè
È«±íɨÃè¾ÍÊÇ˳ÐòµØ·ÃÎʱíÖÐÿÌõ¼Ç¼. ORACLE²ÉÓÃÒ»´Î¶ÁÈë¶à¸öÊý¾Ý¿é(database block)µÄ·½Ê½ÓÅ»¯È«±íɨÃè.
2.ͨ¹ýROWID·ÃÎʱí
Äã¿ÉÒÔ²ÉÓûùÓÚROWIDµÄ·ÃÎÊ·½Ê½Çé¿ö,Ìá¸ß·ÃÎʱíµÄЧÂÊ, , ROWID°üº¬Á˱íÖмǼµÄÎïÀíλÖÃÐÅÏ¢..ORACLE²ÉÓÃË÷Òý(INDEX)ʵÏÖÁËÊý¾ÝºÍ´æ·ÅÊý¾ÝµÄÎïÀíλÖÃ(ROWID)Ö®¼äµÄÁªÏµ. ͨ³£Ë÷ÒýÌṩÁË¿ìËÙ·ÃÎÊROWIDµÄ·½·¨,Òò´ËÄÇЩ»ùÓÚË÷ÒýÁеIJéѯ¾Í¿ÉÒԵõ½ÐÔÄÜÉϵÄÌá¸ß.
3.¹²ÏíSQLÓï¾ä
ΪÁ˲»Öظ´½âÎöÏàͬµÄSQLÓï¾ä,ÔÚµÚÒ»´Î½âÎöÖ®ºó, ORACLE½«SQLÓï¾ä´æ·ÅÔÚÄÚ´æÖÐ.Õâ¿éλÓÚϵͳȫ¾ÖÇøÓòSGA(system global area)µÄ¹²Ïí³Ø(shared buffer pool)ÖеÄÄÚ´æ¿ÉÒÔ±»ËùÓеÄÊý¾Ý¿âÓû§¹²Ïí. Òò´Ë,µ±ÄãÖ´ÐÐÒ»¸öSQLÓï¾ä(ÓÐʱ±»³ÆΪһ¸öÓαê)ʱ,Èç¹ûËüºÍ֮ǰµÄÖ´ÐйýµÄÓï¾äÍêÈ«Ïàͬ, ORACLE¾ÍÄܺܿì»ñµÃÒѾ±»½âÎöµÄÓï¾äÒÔ¼°×îºÃµÄÖ´Ðз¾¶. ORACLEµÄÕâ¸ö¹¦ÄÜ´ó´óµØÌá¸ßÁËSQLµÄÖ´ÐÐÐÔÄܲ¢½ÚÊ¡ÁËÄÚ´æµÄʹÓÃ.
¿ÉϧµÄÊÇORACLEÖ»¶Ô¼òµ¥µÄ±íÌṩ¸ßËÙ»º³å(cache buffering)
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1¡£Sysdate µ±Ç°È ......
PL/SQL µÄÒì³£(Ô¤¶¨ÒåÒì³£)
2009-08-13 20:24
Òì³£Ãû³Æ & ......
#! /bin/bash
if [ -f ~/.bashrc ];then
. ~/.bash_profile
fi
export script=/home/oracle/script
export bakdata_destination=/u02/rman_backup/data
export baklog_destination=/u02/rman_backup/log
export datadir=`date +'%Y_%m_%d'`
export days=`date +'%w'`
if ! test -d $script
then
&nb ......