Here is a simple way to enable them. In mysql we need to see often 3 logs which are mostly needed during any project development.
The Error Log
. It contains information about errors that occur while
the server is running (also server start and stop)
The General Query Log
. This is a general record of what mysqld is
doing (connect, disconnect, queries)
The Slow Query Log
. Ιt consists of "slow" SQL statements (as
indicated by its name).
By default no log files are enabled in MYSQL. All errors will be shown in the syslog (/var/log/syslog
).
To Enable them just follow below steps:
step1: Go to this file (/etc/mysql/conf.d/mysqld_safe_syslog.cnf) and remove or comment those line.
step2: Go to mysql conf file (/etc/mysql/my.cnf
) and add following lines
To enable error log add following
[mysqld_safe]
log_error=/var/log/mysql/mysql_error.log
[mysqld]
log_error=/var/log/mysql/mysql_error.log
To enable general query log add following
general_log_file = /var/log/mysql/mysql.log
general_log = 1
To enable Slow Query Log add following
log_slow_queries = /var/log/mysql/mysql-slow.log
long_query_time = 2
log-queries-not-using-indexes
step3: save the file and restart mysql using following commands
service mysql restart
To enable logs at runtime, login to mysql client (mysql -u root -p
) and give:
SET GLOBAL general_log = 'ON';
SET GLOBAL slow_query_log = 'ON';
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