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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
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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 ......
ÓÐ2¸ö²»Í¬µÄ·½·¨Ôö¼ÓÓû§£ºÍ¨¹ýʹÓÃGRANTÓï¾ä»òͨ¹ýÖ±½Ó²Ù×÷MySQLÊÚȨ±í¡£±È½ÏºÃµÄ·½·¨ÊÇʹÓÃGRANTÓï¾ä£¬ÒòΪËûÃÇÊǸü¼òÃ÷²¢ÇÒºÃÏñ´íÎóÉÙЩ¡£
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ro ......
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¡¡¡¡.mrg union±íµÄÃû×ÖÇåµ¥
¡¡¡¡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
Ò² ......
use mysql
update user set Password=password('newpassword') where User='root';
flush privileges;
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2.ÔÚÃüÁîÐÐÖÐʹÓÃÈçÏÂÃüÁî
MYSQLADMIN -u root -p PASSWORD mypasswd
3.¿ÉÒÔÐÞ¸ÄMYSQLÎļþ¼ÐÖеÄMY.INIÎļþ
4.ʹÓÃSET PASSWORDÓï¾ ......