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 1. -static  13%
   --with-client-ldflags=-all-static
   --with-mysqld-ldflags=-all-static
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2. -pgcc  1%
   CFLAGS="-O3 -mpentiumpro -mstack-align-double" CXX=gcc \
     CXXFLAGS="-O3 -mpentiumpro -mstack-align-double \
     -felide-constructors -fno-exceptions -fno-rtti"
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3. Unix Socket  7.5%
   --with-unix-socket-path=/usr/local/mysql/tmp/mysql.sock
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4. --enable-assembler
ÔÊÐíʹÓûã±àģʽ(ÓÅ»¯ÐÔÄÜ)
  
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±àÒë´úÂë
 
CFLAGS="-O3" CXX=gcc CXXFLAGS="-O3 -felide-constructors \ 
       -fno-exceptions -fno-rtti -fomit-frame-pointer -ffixed-ebp"  
    ./configure \  
       --prefix=/usr/local/mysql --enable-assembler \  
       --with-mysqld-ldflags=-all-static  
       --with-client-ldflags=-all-static  
       --with-unix-socket-path=/usr/local/mysql/tmp/mysql.sock  
     --with-charset=utf8  
       --with-collation=utf8_general_ci  
       --with-extra-charsets=all  


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select id from message where author_id in (select followed_id from Relation where follower_id=1) order by id desc   ºÍ ·Ö±ðÖ´ÐÐ $userlist = select followed_id from Relation where follower_id=1 ÔÙ select id from message where author_id in ($userlist) order by id desc   ¾¹È»ÓÐÁ½¸öÊýÁ ......

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ro ......

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¡¡¡¡Á½¸ö»ù±¾±í:
¡¡¡¡CREATE TABLE TEST_MERGE_1(
¡¡¡¡ID INT(5) NOT NULL,
¡¡¡¡VALUE VARCHAR(100) NOT NULL,
¡¡¡¡PRIMARY KEY(ID)
¡¡¡¡)
¡¡¡¡CREATE TABLE TEST_MERGE_2(
¡¡¡¡ID INT(5) NOT N ......

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ASCII(str) ·µ»Ø×Ö·û´®strµÄ×î×óÃæ×Ö·ûµÄASCII´úÂëÖµ¡£Èç¹ûstrÊÇ¿Õ×Ö·û´®£¬·µ»Ø0¡£Èç¹ûstrÊÇNULL£¬·µ»ØNULL¡£
mysql> select ASCII('2');
-> 50
mysql> select ASCII(2);
-> 50
mysql> select ASCII('dx');
-> 100
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use mysql
update user set Password=password('newpassword') where User='root';
flush privileges;
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MYSQLADMIN -u root -p PASSWORD mypasswd
3.¿ÉÒÔÐÞ¸ÄMYSQLÎļþ¼ÐÖеÄMY.INIÎļþ
4.ʹÓÃSET PASSWORDÓï¾ ......
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