Ò׽ؽØͼÈí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

MYSQL °üº¬ÊÂÎï,²ÎÊý,ÓαêµÈµÄ×ÛºÏʹÓÃÀý×Ó,Ç°ÕÂ(1)

  1.Ê×ÏȵöÔmysql ÀïÃæµÄ²ÎÊý½øÐнéÉÜÏÂ:
     procedure--in:ÊäÈë²ÎÊý,outÊä³ö²ÎÊý,inoutÕâ¸ö¾Í²»ÓÃ˵ÁË,´ó¸ÅÒ²²Âµ½ÁË
                       declare:ÉùÃ÷±äÁ¿.¼ÇÖ÷,ËùÓÐÉùÃ÷±ØÐëÔÚ·ÇÉùÃ÷Óï¾äÇ°Íê³É,·ñÔò»á±¨´í
   2.mysql ³£Óú¯Êý½éÉÜ:
       *.concat('s','a',5) ¿ÉÒÔÄÇÊýֵת»»³É×Ö·û´®,Ò²¿ÉÒÔ½øÐÐ×Ö·û´®µÄºÏ²¢
            Èç:set str=concat('asd','ad',56)  ----> str='asdad56'
                declare num in;set num=156;set @ste=concat('',num)|(num);-->@str='156'
                mysql> select CONCAT('My', NULL, 'QL');
¡¡¡¡            -> NULL
      *.ASCII(str),·µ»Ø×Ö·û´®strµÄµÚÒ»¸ö×Ö·ûµÄASCIIÖµ(strÊÇ¿Õ´®Ê±·µ»Ø0)
            Èç:mysql> select ASCII('2');-> 50
      *.CONV(N,from_base,to_base),¶ÔÊý×ÖN½øÖÆת»»,²¢×ª»»Îª×Ö´®·µ»Ø(ÈκβÎÊýΪNULLʱ·µ»ØNULL,½øÖÆ·¶Î§Îª2-36ÖÆ,             µ±to_baseÊǸºÊýʱN×÷ΪÓзûºÅÊý·ñÔò×÷ÎÞ·ûºÅÊý,CONVÒÔ64λµã¾«¶È¹¤×÷)
           Èç:mysql> select CONV("a",16,2);
¡¡¡¡          -> '1010'
                mysql> select CONV(-17,10,-18);
¡¡¡¡          -> '-H'
                mysql> select CONV(10+"10"+'1


Ïà¹ØÎĵµ£º

MySQL Êý¾Ý¿â InnoDBÒýÇæµÄ²åÖµÎÊÌâ

InnoDBÊÇmysqlÊý¾Ý¿âÖÐΨһһ¸öÖ§³ÖÍâ¼üµÄÒýÇ棬µ«ÊDzîÖµµÄʱºòÈ´µÃ×¢ÒâÒ»ÏÂ
±ÈÈçÓÐÁ½ÕÅ±í£¬album(id,name,path) £¬picture(id,name,path,parent_album)£¬ÆäÖбí2ÖÐparent_albumÊÇÍâ¼ü
´Ëʱ²îÖµinsert into picture (name,path,parent_album) values ("pic","path",68) (68ÊÇÒ»¸öÏà²áµÄid)
mysql»á±¨´í"Failed to read a ......

Windowsƽ̨¶àMYSQLÅäÖÃ(¶àMy.ini)

    ×î½üÔÚѧϰSSH£¬ÓÉÓÚΪÁ˽ÚÔ¼Äڴ棬ËùÒÔ¾Í×¼±¸Ê¹ÓÃMYSQL´úÌæOracle£¬ÎªÁ˸üÉîÒ»²½µØÁ˽âMySQL£¬ÓÚÊǾͼƻ®°²×°noinstall°æ±¾£¬Õâ°æ±¾±È°²×°°æ¿ÉÂ鷳һЩ£¬ÌرðÊÇÅäÖ÷½Ã棬Èç¹ûÅäÖúõĻ°¾Í¿ÉÒÔÔÚһ̨»úÆ÷ÉÏÔËÐжà¸ö°æ±¾µÄMYSQL£¬ÔÚÍøÉÏÕÒÁËÇ°±²ÃǵıʼǺóѧϰÍê±ÏºóÔټǼһ±Ê£¬¾ÍÎÒÕâ¼ÇÐÔ£¬¹À¼Æà ......

mysqlά»¤³£ÓÃÃüÁî

Analyze Table
MySQL µÄOptimizer£¨ÓÅ»¯Ôª¼þ£©ÔÚÓÅ»¯SQLÓï¾äʱ£¬Ê×ÏÈÐèÒªÊÕ¼¯Ò»Ð©Ïà¹ØÐÅÏ¢£¬ÆäÖоͰüÀ¨±íµÄcardinality£¨¿ÉÒÔ·­ÒëΪ“É¢Áг̶Ȕ£©£¬Ëü±íʾij¸öË÷Òý¶ÔÓ¦µÄÁаüº¬¶àÉÙ¸ö²»Í¬µÄÖµ——Èç¹ûcardinality´ó´óÉÙÓÚÊý¾ÝµÄʵ¼ÊÉ¢Áг̶ȣ¬ÄÇôË÷Òý¾Í»ù±¾Ê§Ð§ÁË¡£
ÎÒÃÇ¿ÉÒÔʹÓÃSHOW& ......

dz̸MySQLÂý²éѯÈÕÖ¾¼°microslow patch(msl patch)

mysql(°üÀ¨ËùÓÐ5.*ϵÁÐ,5.1.21֮ǰ)µÄÂý²éѯÈÕ־ĬÈÏÊÇÒÔÃëΪµ¥Î»µÄ,¿ÉÒÔͨ¹ýset [session|global] long_query_time=1Õâ¸ö×îµÍÒ²¾ÍÊÇ¿ÉÒÔÉèÖõ½1Ãë,¶ÔÓÚ0.5,0.005Ö®Àà¾ÍÎÞÄÜΪÁ¦ÁË,Õâʱºò¿ÉÒÔÓÐmicroslow patch(msl patch)²¹¶¡À´Íê³ÉÕâÒ»¹¤×÷,Õâ¸ö¹¦Äܵĺô¦×ÔÈ»²»ÑÔ¶øÓ÷. ÔÚmysql5.1.21¼°ÒÔºó°æ±¾¿ÉÒÔͨ¹ýset [session|gl ......

CentoS5ϱàÒë°²×°mysqlÊý¾Ý¿â

ΪʲôѡÔñÔ´Âë±àÒë°²×°mysql£ºÎÒÔÚʹÓÃrpm»òÕßÊÇyum°²×°Ê±myql£¬ÀÏÊÇÌáʾÎÒÕÒ²»µ½*.sockÎļþ£¬ÕÒÁ˵ã
×ÊÁÏ˵ÊǸðüÊǷǹٷ½°æ±¾£¨Ã÷Ã÷Êǹٷ½ÏÂÔØ µÄ£©£¬ÆäÖÐÔ­Òòµ½ÏÖÔÚ»¹Ã»ÓиãÇå³þ¡£Ï£ÍûÖªÇéÈËÊ¿¸æÖª¡££¨¿ªÊ¼±àÒëµÄʱºò£¬ÏµÍ³»·¾³Ò»¶¨ÒªÅäÖúã¬GCC£¬GC++...µÈµÈµÄ±àÒëÆ÷Ò»¶¨Òª×öºÃ,±¾È˵ÄcentosÓÉÓÚ¿ªÊ¼
ϵͳ»·¾³Ã»ÅäÖ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØͼ | ¸ÓICP±¸09004571ºÅ