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There may be situations in which a full index scan is expected or necessary. Logging queries that aren’t using indexes can significantly increase verbosity. Queries that have an index available will still be logged if they lack constraints that limit the number of fetched rows.

This can help identify when a query is missing an index or is unable to use it. log_queries_not_using_indexes = 1 – When this setting is enabled, queries which are expected to retrieve all the records from the target table or view will be logged, even if they didn’t exclude the slow query threshold.Use log_slow_slave_statements instead for MySQL versions 8.0.26 and older.

log_slow_replica_statements = 1 – This setting enables slow query logging for replicated queries on replica servers.

Nonetheless this setting can be helpful if your application also dynamically performs these tasks. This is rarely desirable as these operations are usually run during maintenance and migration scripts.

log_slow_admin_statements = 1 – Includes administrative SQL statements such as ALTER TABLE, CREATE INDEX, DROP INDEX, and OPTIMIZE TABLE.

You can extend the log to include this information by making the following changes to your config file: This will ensure logging’s resumed automatically after the MySQL server restarts. You should enable the slow query log in your MySQL configuration file if you plan to use it long-term. Conversely, very low values can cause too many queries to be captured, creating an excessively noisy log. Too high a threshold will exclude queries that are actually impacting performance. It’s important to find a balance that suits your own application. The value sets the minimum duration for slow queries. You can change the limit by setting the long_query_time variable: SET GLOBAL long_query_time=1 This limit is usually too relaxed for user-facing web applications where near-instant responses are expected. MySQL counts a query as “slow” if it takes over 10 seconds to complete. You can review this file periodically to identify poorly performing queries. Slow queries will now be logged to /var/log/mysql/mysql-slow.log. You can activate it on your server by running the following command from an administrative MySQL shell: SET GLOBAL slow_query_log_file='/var/log/mysql/mysql-slow.log' Slow query logging is turned off by default.