MySQL is a popular relational database management system that is widely used by businesses and individuals. When you need to reinstall MySQL or upgrade to a new version, you usually need to uninstall the old version first. This article will explain how to uninstall and install MySQL to ensure you can manage the database correctly.
1. Uninstall MySQL
First, you need to open the terminal, log in as administrator and run the following command to uninstall MySQL:
sudo rm -rf /usr/local/mysql* sudo rm -rf /Library/StartupItems/MySQLCOM sudo rm -rf /Library/PreferencePanes/My* sudo vim /etc/hostconfig
Find the following line in the editor :
MYSQLCOM=-YES-
Remove or comment it out, then save and close the file. Next, run the following command to remove other related files:
sudo rm -rf /Library/Receipts/mysql* sudo rm -rf /Library/Receipts/MySQL* sudo rm -rf /var/db/receipts/com.mysql.*
Now you have completely uninstalled MySQL. The next step is to reinstall it.
2. Install MySQL
Before starting the installation, please make sure that Homebrew and Xcode command line tools are installed on your Mac. If you haven't installed these tools yet, you can follow the steps below to install them.
1. Install Homebrew
Homebrew is a package manager that allows you to install various software packages on your Mac. Open a terminal and run the following command to install Homebrew:
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
2. Install the Xcode command line tool
Xcode is a powerful IDE and development tool for developing and compiling software. You need to install the Xcode command line tools to use many of its features. Open a terminal and run the following command to install the Xcode command line tools:
xcode-select --install
Now you can install MySQL. Run the following command to install MySQL using Homebrew:
brew install mysql
After the installation is complete, you need to start the MySQL service. Run the following command to start MySQL:
brew services start mysql
Now, MySQL has been successfully installed and running on your Mac. You can use the following command to view the MySQL service status:
brew services list | grep mysql
If the server status displays "started", it means that MySQL has been successfully started on your Mac.
3. Configure MySQL
After successfully installing and starting MySQL, you need to configure MySQL to ensure that it runs at its best. Run the following command in the terminal to open the MySQL configuration file:
sudo vim /usr/local/etc/my.cnf
In the editor, you can configure MySQL using the following options:
The configuration file will usually need to be edited to suit your specific needs, but you may consider using the following sample configuration:
[mysqld] port=3306 bind-address=0.0.0.0 max_allowed_packet=64M
This will cause the MySQL server to bind to all available IP addresses and allow Larger packet size.
4. Using MySQL
After successfully installing and configuring MySQL, you can use the MySQL client to connect to the MySQL server. Run the following command to connect to MySQL:
mysql -u root -p
You will be prompted for the root user password for MySQL. After entering your password, you will enter the MySQL console.
Now you can use MySQL commands to perform various operations, such as creating new users, creating new databases, etc. Here are some important MySQL commands:
Summary
Uninstall and install MySQL is a common task that many Mac users need to perform. Using the steps provided in this article, you can safely uninstall the old version of MySQL and install the new version after ensuring correct configuration. Using MySQL commands, you can easily manage the widely used relational database management system.
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