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：
mysql 大对象存取:
类型一般应该用mediumblod,
blob只能存2的16次方个byte,
mediumblod是24次方,
一般来说够用了.longblob是32次方有些大.
MYSQL默认配置只能存1M大小的文件,要修改配置,WIN版本的在mysql.ini文件中
修改max_allowed_packet,net_buffer_length等几个参数,或直接SET GLOBAL varName=value.
linux版� ......
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,
......
Each MySQL Cluster host computer running an SQL node must have
installed on it a MySQL binary. For management nodes and data
nodes, it is not necessary to install the MySQL server binary, but
management nodes require the management server daemon
......
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� ......
1.配置名字为myodbc的数据源
2.在stdafx.h中加上
#import "c:\program files\common files\system\ado\msado15.dll" no_namespace rename ("EOF", "adoEOF")
3.在程序初始化的方法中加上
AfxEnableControlContainer();
// 初始化COM,创建ADO连接等操作
AfxOleInit();
4.在合适的地方加上
public:_ConnectionPt ......
