mysql 5.1 configure 编译参数详解
-static 13%
--with-client-ldflags=-all-static
--with-mysqld-ldflags=-all-static
静态链接提高13%性能
Unix Socket 7.5%
--with-unix-socket path=/usr/local/mysql/tmp/mysql.sock
使用unix套接字链接提高7.5%性能，所以在windows下mysql性能肯定不如unix下面
--enable-assembler
The --enable-assembler options of configure allows for
compiling in x86 (and sparc) versions of common
string
operations, which should result in more
performance.
汇编x86的普通操作符，可以提高性能
--with-extra-charsets
=complex字符支持
--enable-thread-safe-client
#Compile the client with
threads. 也就是让客户端支持线程的意思
--with-big-tables
There is a limit of 232
(~4.295E+09) rows in a MyISAM
table. If you build MySQL
with the --with-big-tables
option, the
row limitation is increased to (232
)2
(1.844E+19) rows
--with-ssl
--with-embedded-server
#编译成embedded MySQL library (libmysqld.a
),
--enable-local-infile
#让mysql支持从本地文件 导入数据库
load data local infile '/usr/test' into table test fields terminated by ' ';
ERROR 1148 (42000): The used command is
not allowed with this
MySQL version）
--with-plugins=innobase
存储引擎
Mysql5.1开始，编译添加innodb插件就从--with-innodb 改成了 --with-plugins=innobase
--with-plugins=PLUGIN[[[,PLUGIN..]]]
Plugins to include in
mysqld. (default
is
: none)
相关文档：
#两日期/时间之间相差的天数：
To_Days(end_time)-To_Days(start_time)
#两日期/时间之间相差的秒数：
SELECT UNIX_TIMESTAMP(end_time)- UNIX_TIMESTAMP(start_time);
#两日期/时间之间相差的时分数：
SELECT SEC_TO_TIME(UNIX_TIMESTAMP(end_time)- UNIX_T ......
Love in coding...
Free and Susan
[引]MySQL INNODB类型表的外键关联设置
Here is a simple example that relates parent and child tables through a single-column foreign key:
CREATE TABLE parent (id INT NOT NULL,
......
了解了一些最基本的操作命令后，我们再来学习如何创建一个数据库和数据库表。
1、使用SHOW语句找出在服务器上当前存在什么数据库：
mysql> SHOW DATABASES; +----------+
| Database | +----------+ | mysql |
| test | +----------+ 3 rows in set (0.00 sec)
2、创建一个数据库abccs
mysql> ......
For our four-node, four-host MySQL Cluster, it is necessary to
write four configuration files, one per node host.
Each data node or SQL node requires a
my.cnf
file that provides two pieces of
information: a connectstring
that tells
......
GROUP_CONCAT 是一个合并多行的函数，一般用的少，所以很多人都不知道，我也是一个，今天偶然看到，故记下方法；
GROUP_CONCAT的语法如下：
GROUP_CONCAT([DISTINCT] expr [,expr ...][ORDER BY {unsigned_integer | col_name | expr}[ASC | DESC] [,col_name ...]][SEPARATOR str_val])
下面演示一下这个函数，先建立� ......
