mysql uninstall and install

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:

• port: The port number of the MySQL server; default It is 3306.
• bind-address: The IP address bound to the MySQL server; the default is 127.0.0.1.
• max_allowed_packet: The maximum packet size allowed by MySQL; the default is 4MB.

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:

• CREATE USER: Create a new user.
• GRANT: Grant specific permissions to a specific user.
• CREATE DATABASE: Create a new database .
• USE: Select the currently active database.
• SHOW: Display information about the MySQL server and the current database.

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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