Initial Startup of MySQL Cluster
Starting the cluster is not very difficult after it has been configured. Each cluster node process must be started separately, and on the host where it resides. The management node should be started first, followed by the data nodes, and then finally by any SQL nodes:
On the management host, issue the following command from the system shell to start the management node process:
shell> ndb_mgmd -f /var/lib/mysql-cluster/config.ini
Note
ndb_mgmd
must be told where to find its configuration file, using the
-f
or
--config-file
option. (See
Section 4.4, “ndb_mgmd
— The MySQL Cluster Management Server Daemon”
, for details.)
For additional options which can be used with
ndb_mgmd
, seeSection 4.23, “Options Common to MySQL Cluster Programs”
.
On each of the data node hosts, run this command to start the
ndbd
process:
shell> ndbd
If you used RPM files to install MySQL on the cluster host where the SQL node is to reside, you can (and should) use the supplied startup script to start the MySQL server process on the SQL node.
If all has gone well, and the cluster has been set up correctly, the cluster should now be operational. You can test this by invoking the
ndb_mgm
management node client. The output should look like that shown here, although you might see some slight differences in the output depending upon the exact version of MySQL that you are using:
shell> ndb_mgm
-- NDB Cluster -- Management Client --
ndb_mgm> SHOW
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)] 2 node(s)
id=2 @192.168.0.30 (Version: 5.1.41-ndb-6.3.31, Nodegroup: 0, Master)
id=3 @192.168.0.40 (Version: 5.1.41-ndb-6.3.31, Nodegroup: 0)
[ndb_mgmd(MGM)] 1 node(s)
id=1 @192.168.0.10 (Version: 5.1.41-ndb-6.3.31)
[mysqld(API)] 1 node(s)
id=4 @192.168.0.20 (Version:
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ID | name|
----+--------+
1 |2toon|
2 |1*xyz|
语句1:
select * from tb1 where ID='2toon' or name ='2toon';
mysql服务器在某模式下,可以执行这条句,就成功返回两条记录,原因在于 ID=‘2toon’ 加了单引号,mysql解释为 ID=2.
语句2
select * fro ......
#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 ......
首先要声明一点,大部分情况下,修改MySQL是需要有mysql里的root权限的,
所以一般用户无法更改密码,除非请求管理员。
方法一
使用phpmyadmin,这是最简单的了,修改mysql库的user表,
不过别忘了使用PASSWORD函数。
方法二
使用mysqladmin,这是前面声明的一个特例。
mysqladmin -u root -p password mypas ......
以下内容在ubuntu 9.04 server系统上测试通过
用apt-get install vsftp安装的时候相关的文件位置:
主配置文件:/etc/vsftpd.conf
验证配置文件/etc/pam.d/vsftpd
重启:/etc/init.d/vsftpd restart
vsftp Mysql验证方式:
MYSQL已经安装在/usr/local/mysql
直接安装vsftp
sudo apt-get install vsftp
安装pam_mys ......