Reading notes - MySQL technology l act: InnoDB storage engine (version 2)

The first 1 Chapter MySQL Architecture and storage engine

1.1 Define databases and instances

         database ： A collection of physical operating system files or other forms of file types . stay MySQL In the database , Database files can be frm、MYD、MYI、ibd Final document .

          example ：MySQL The database consists of a background thread and a shared memory area . Shared memory can be shared by running background threads . Database instance is really used to operate database files .

        MySQL It is designed as a single process multithreaded database , namely MySQL The performance of database instance on the system is a process .

         stay Linux Start in the operating system by the following command MySQL Database instance , And by order ps Observe MySQL The process after the database is started ：

[[email protected] bin]#./mysqld_safe＆

[[email protected] bin]#ps-ef|grep mysqld

root 3441 3258 0 10:23 pts/3 00:00:00/bin/sh./mysqld_safe

mysql 3578 3441 0 10:23 pts/3 00:00:00

/usr/local/mysql/libexec/mysqld--basedir=/usr/local/mysql

--datadir=/usr/local/mysql/var--user=mysql

--log-error=/usr/local/mysql/var/xen-server.err

--pid-file=/usr/local/mysql/var/xen-server.pid

--socket=/tm