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1. MySQL µÄ°æ±¾
Èç¹ûÒªÖ§³Ö·ÖÇø±í£¬ÔòÓ¦¸ÃʹÓà5.1.x ÒÔÉϵİ汾¡£Èç
mysql> show variables like '%version%';
+-------------------------+------------------------------+
| Variable_name           | Value                        |
+-------------------------+------------------------------+
| protocol_version        | 10                           |
| version                 | 5.1.45-community-log         |
| version_comment         | MySQL Community Server (GPL) |
| version_compile_machine | x86_64                       |
| version_compile_os      | unknown-linux-gnu            |
+-------------------------+------------------------------+
2. MySQL µÄ»ù±¾²ÎÊýÉ趨
´Ë´¦Éæ¼°µÄ²ÎÊýÊÇÔÚÓ¦ÓÃÖв»¶Ï¸üеġ£ÈçÏÂΪ /etc/my.cnf ²¿·ÖÄÚÈÝ
[mysqld]
datadir=/var/lib/mysql
datadir=/home/mysql/data
socket=/var/lib/mysql/mysql.sock
user=mysql
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
#old_passwords=1
#mysql 5.0 --log-slow-queries
#log-slow-queries=/var/log/mysql/slowquery.log
#log-queries-not-using-indexes=/var/log/mysql/noindex.log
#mysql 5.1
slow_query_log=1
slow_query_log_file=/var/log/mysql/slowquery.log
log-queries-not-using-indexes=1
#´´½¨Ï̳߳ØÀ´´¦Àí´óÁ´½ÓÁ¿µÄÓ¦ÓÃ
thread_cache_size=80
#¼Ó¿ì¿Í»§¶ËÁ´½ÓËÙ¶È,¿ÉÒÔÆÁ±ÎµôËùÓеÄip·´Ïò½âÎö
#µ±Ê±×¢Òâµ½´ËÎÊÌ⣬ÊÇÒòΪÔÚ show processlist µÄʱºò£¬·¢ÏÖÁË´óÁ¿µÄ user = 'unauthenticated user'Á´½Ó´æÔÚ¡£
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rm -fv *.o;ls -al;
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(1)ÔÚ¿ØÖÆÌ¨ÊäÈ룺
   sh clean
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MySQL Basic Knowledge

MySQL°æ±¾: Server version: 5.1.44 Source distribution
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$ mysqladmin -u root password 123456
Èç¹ûÓÐÃÜÂëʹÓÃÏÂÃæµÄÃüÁî, ½«ÃÜÂë¸ÄΪ"123456"
$ mysqladmin -u root -p password 123456
Enter password:
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public class TestService {
public static TestService test=null;
public static TestService getTestService(){
if(test==null){
test=new TestService();
}
return test;
}
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MysqlÖÐcount(*),DISTINCTµÄʹÓ÷½·¨ºÍЧÂÊÑо¿

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SELECT count(*) from tablename
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MysqlÓÅ»¯¼¼ÇÉ

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ÐÞ¸Ä my.cnf (»òÕßmy.ini)£¬¼ÓÈë/ÐÞ¸ÄÒÔϼ¸ÐÐ
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back_log = 64
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external-locking = 0
#½ûÓÃBDB,Èç¹ûÄãȷʵ²»ÐèÒªµÄ»°,innodbÒ²ÊÇÈç´Ë
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