How Do I Enable MySQL\'s Slow Query Log Without Restarting?

Enable MySQL's Slow Query Log Without Restarting MySQL

You have attempted to modify MySQL's slow query logging settings using the instructions provided, but the threshold alone does not seem to suffice. According to MySQL's documentation, specifying a file name is not mandatory, and the default log file name is typically generated based on the host name. However, you do not seem to have a slow query log file on your server.

If you are running MySQL version 5.0.77, the syntax for enabling the slow query log is slightly different from later versions:

SET GLOBAL log_slow_queries = 1;

Unfortunately, you encounter an error indicating that the 'log_slow_queries' variable is read-only. This suggests that you will need to restart the MySQL server to apply the changes. However, restarting the server is not the only option.

For MySQL 5.1 and later, an alternative method is available:

SET GLOBAL slow_query_log = 'ON';

Additionally, you may need to flush the logs using:

FLUSH LOGS;

This approach assumes you are using MySQL 5.1 or a later version. If your MySQL version is earlier, restarting the server with 'log_slow_queries' set in the configuration file remains the necessary step.

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