Linux mysql installation directory

Under Linux systems, MySQL is a commonly used open source relational database management system. It can be used to store large amounts of data and provide efficient data operation methods. For Linux system administrators and developers, installing MySQL is a very important step. However, for users who are not familiar with Linux systems, the MySQL installation directory may be difficult to find. This article will introduce to you where the default installation directory of MySQL is and how to expand the MySQL installation directory under the Linux system.

1. The default installation directory of MySQL

For most Linux systems, the default installation directory of MySQL is located in the subdirectory under "/usr/". Generally speaking, under the /usr/ directory, there will be a subdirectory named "mysql", and all MySQL related files are in this directory. The most important files in this directory include:

1. bin directory: stores all MySQL executable files, including MySQL server programs and client programs.
2. data directory: By default, MySQL will store all data files in this directory. These data include databases, tables, indexes and other data in MySQL.
3. lib directory: stores MySQL library files, which include MySQL drivers and components.
4. include directory: stores MySQL header files, which can be used by developers in programs.
5. share directory: stores MySQL shared files, including documents, sample programs, configuration files, etc.
6. support-files directory: stores the configuration files of the MySQL server. The files in this directory can be used to start, shut down, and configure the MySQL server.

2. Expand the installation directory of MySQL

For some more complex application scenarios, such as expanding the storage space of MySQL or separating the locations of the MySQL server and database files, this When we need to expand the MySQL installation directory to other directories. The operation method is as follows:

1. Create a new MySQL data file directory

First, we need to create a new MySQL data file directory. This directory is used to store MySQL data files, such as MySQL databases, tables, indexes and other data. When creating this directory, we need to set the permissions of the directory to ensure that the MySQL server can read, write, execute and other operations on the directory.

2. Modify the MySQL configuration file

In the MySQL installation directory, there is a configuration file named "my.cnf", which stores the configuration file of the MySQL server. Configuration information. We need to open the file and modify the "datadir" item in it, changing the value of this item to the path of the newly created MySQL data file directory. For example:

[mysqld]
datadir=/data/mysql-data

3. Copy the MySQL library file to the new directory

Execute as follows Command to copy the MySQL library files to the new directory:

cp -rp /usr/mysql/lib /data/mysql-data/

4. Start the MySQL server

After completing the above operations, we can start the MySQL server and let it read the new configuration file and new data file directory. At this point, we can connect to the MySQL server through the MySQL client program and perform related operations, such as creating databases and tables.

In short, MySQL is an open source database management system widely used in Linux systems. For Linux system administrators and developers, it is very necessary to know the MySQL installation directory. In most cases, the default installation directory for MySQL is located in the /usr/mysql/ directory. For some special needs, we can also expand the MySQL installation directory to other directories so that MySQL can better meet our needs.

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