From ovaistariq.net
Reference MySQL Documentation Here
MySQL 5.5 has created a lot of hype and its not just hype, there are major performance enhancements not only in the MySQL server itself but in the newer InnoDB plugin shipped with MySQL 5.5. That’s exactly the reason why I have myself upgraded to MySQL 5.5 (The server running this blog run MySQL 5.5). Now since I haven’t come across a guide to help in upgrading to MySQL 5.5, I thought why not make one myself. So here goes nothing!
Download the binary
$ cd /root/
$ wget http://dev.mysql.com/get/Downloads/MySQL-5.5/mysql-5.5.8-linux2.6-i686.tar.gz/from/http://mysql.oss.eznetsols.org/
$ mv index.html mysql-5.5.8-linux2.6-i686.tar.gz
Backup the MySQL configuration
$ mkdir /root/mysql-5.1-conf
$ cp -R /etc/mysql/ /root/mysql-5.1-conf
Backup the data directory
We will be backing up the data in the form of SQL dump as well as by copying the data files over to a safe place, just to be 100% sure about the data not getting lost.
$ mkdir /root/mysql-5.1-data
$ cp -R /var/lib/mysql/ /root/mysql-5.1-data
Backup the data as SQL dump
Backup the mysql database separately and not with all the other databases, because we are going to need it before we restore all the databases.
$ mkdir /root/mysql-5.1-dump
$ mysqldump -u user_name -p --databases mysql > /root/mysql-5.1-dump/mysql.sql
$ mysqldump -u user_name -p --databases db_name > /root/mysql-5.1-dump/db_name.sql
Install the asynchronous I/O library
This is so that we can take advantage of the asynchronous I/O capability in the new InnoDB plugin that ships with MySQL 5.5
$ apt-get install libaio-dev
Untar the archive
$ tar xzvf mysql-5.5.8-linux2.6-i686.tar.gz
Copy or move the untarred MySQL directory to the installation directory
$ cp -R mysql-5.5.8-linux2.6-i686 /usr/local/
$ cd /usr/local/
$ ln -s mysql-5.5.8-linux2.6-i686 mysql
Remove the older version of MySQL
Now is the time to remove the older version of MySQL, in this case I assume the older version to be MySQL 5.1
$ apt-get remove mysql-server-5.1
$ apt-get autoremove
$ apt-get remove mysql-client
$ apt-get autoremove
Add the path to MySQL bin directory to the PATH variable
$ vim /etc/environment
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/mysql/bin"
Set the correct file and directory permissions on the MySQL installation directory
Setting correct permissions is very important, make sure that all the files except those under the data directory are owned by root. The data directory has to be owned by the user mysql.
$ cd /usr/local/mysql
$ chown -R mysql:mysql data
Create the socket directory
Here again, setting the correct permissions on the socket directory is very important, otherwise MySQL would not run.
$ mkdir /var/run/mysqld/
$ chown -R mysql:mysql /var/run/mysqld/
Copy the sample MySQL configuration file to the etc directory and setup the paths
$ cd /usr/local/mysql/support-files/
$ cp my-large.cnf /etc/my.cnf
Now edit /etc/my.cnf so that it has the following values:
user = mysql
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
tmpdir = /tmp
log_error = /var/log/mysql/error.log
Copy the MySQL server startup script to the startup directory
The MySQL startup script has to be placed in the directory where all the startup scripts reside, so that MySQL starts on system startup. Make sure that you make the startup script executable, and update the rc.d database to notify the system about the presence of a new startup script.
$ cd /usr/local/mysql/support-files/
$ cp mysql.server /etc/init.d/mysql
$ chmod +x /etc/init.d/mysql
$ update-rc.d mysql defaults
Remove the MySQL files from the older version
Make sure you don’t delete files belonging to the new version we are installing.
$ rm -R /var/lib/mysql
$ rm -R /etc/mysql
$ rm -R /usr/lib/mysql
When starting the MySQL server for the first time after the new installation, it has to be started without the grants table, for two reasons. Firstly, because we want to retain the users and privileges data from the previous install of MySQL and secondly, because the schema of the grants table in MySQL 5.5 has changed.
So what we will do is start MySQL without the grants table, import the users and privileges data we backed up earlier in this guide and run the mysql_upgrade script that modifies the schema of the grants table to be in sync with that in MySQL 5.5. After that we will be able to run MySQL normally and have all the users and privileges same as in the previous version we had.
Start MySQL server without grants table.
$ mysqld --skip-grant-tables --user=mysql
Load the MySQL users and privileges data we backed up earlier
$ cd /root/mysql-5.1-backup/dump/
$ mysql < mysql.sql
Run the upgrade script so that everything gets upgraded to the version 5.5
$ mysql_upgrade
Stop the server and start it normally
$ /etc/init.d/mysql stop
$ /etc/init.d/mysql start
There you go, you have a MySQL 5.5 server up and running in no time! Do share your thoughts if you try out MySQL 5.5
