How to enable MariaDB/MySQL logs ?
As a web developer that have been toying with MySQL/MariaDB for more than 5 years. I can tell you that the best way to start debugging your application or looking for ways to improve database performance is to enable the logs. To enable the MySQL/MariaDB logs :
Edit MySQL configuration file:
vi /etc/mysql/my.cnf
Note : Depending on your installation, the my.cnf file could be located on different directory. MariaDB's my.cnf is located at /etc/my.cnf
Slow Query Log
To enable Slow Query Log, add these lines or uncomment these two lines. Change the destination location for the log files if you prefer.
logslowqueries = /var/log/mysql/mysql-slow.log
longquerytime = 2
log-queries-not-using-indexes
To enable Error Log, add these lines or uncomment these two lines. Change the destination location for the log files if you prefer.
[mysqld_safe]
logerror=/var/log/mysql/mysqlerror.log
[mysqld]
logerror=/var/log/mysql/mysqlerror.log
To enable General Query Log, add these lines or uncomment these two lines. Change the destination location for the log files if you prefer.
generallogfile = /var/log/mysql/mysql.log general_log = 1
To enable these changes, restart mysql
sudo /etc/init.d/mysql restart
or
sudo service mysql restart
References :
http://dev.mysql.com/doc/refman/5.7/en/slow-query-log.html
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+4.2k Linux/MacOSX : Search and delete files by extension
+9.1k Golang : How to extract video or image files from html source code
+6.3k Golang : Spell checking with ispell example
+24.2k Golang : Change file read or write permission example
+5.4k Golang : ROT32768 (rotate by 0x80) UTF-8 strings example
+13.9k Android Studio : Use image as AlertDialog title with custom layout example
+15.3k Golang : Convert date format and separator yyyy-mm-dd to dd-mm-yyyy
+13k Android Studio : Password input and reveal password example
+15.2k Golang : Validate hostname
+8.3k Linux/Unix : fatal: the Postfix mail system is already running
+13k Golang : Verify token from Google Authenticator App
+5.5k Golang : Error handling methods