how to enable slow query in mysql

How To Enable Slow Query In MySQL

If you know how to enable slow query in MySQL it’s easy to setup. It can help you analyze the database server response time. you can enable and check a slow query log when you configure with a single command in MySQL.

By default, slow_query_log is off in MySQL 5.5. This helps you to find out which query is taking a long time to execute than the given threshold.

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There are two ways of checking slow_query_log is enabled or not.

Method 1 : show variables like “slow_query_log”;

how to enable slow

Method 2 : mysqladmin var |grep log_slow_queries

enable slow query log

As you can see slow_query_log is off So let’s enable it by globally thorough command in MySQL if you want to enable it permanent you will have to put this in my.cnf file.

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For Enable

SET GLOBAL slow_query_log = 1;

configure slow query log

For Disable

SET GLOBAL slow_query_log = 0;

You need to Set slow log query file path

SET GLOBAL slow_query_log_file = ‘/var/log/mariadb/my-slow.log’;

check slow query log

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Now Check slow query will be ON

show variables like “slow_query_log”;

enable slow query log

Add permanent in vim /etc/my.cnf

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As you can see, By Default slow query log file is located at /var/lib/mysql/mysql-slow.log

Now restart the service,

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You’re done check slow query log configure slow query log check slow query log enable slow query log

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