Here are a few potential titles, keeping in mind the question format and the article\'s focus on MySQL \'Sleep\' connections and \'Too Many Connections\' errors: Focusing on the P

Excessive "Sleep" Entries in MySQL Processlist Causing "Too Many Connections" Errors

Problem:

Excessive idle connections in a "Sleep" state are depleting available connections and triggering "Too Many Connections" errors. The issue persists despite a large number of open connections.

Background:

• "Sleep" connections are typically created when PHP scripts connect to MySQL, execute queries, and then perform other tasks without disconnecting.
• The number of Apache requests never exceeds 50 simultaneously, suggesting that there may be a problem with PHP connections.

my.cnf Configuration:

max_connections = 450
thread_cache = 50

Solution:

1. Identify and Fix Long-Running PHP Processes:

• Ensure that PHP processes are not running for extended periods without performing database operations.
• Promptly disconnect PHP scripts from the database when they no longer require access.

2. Optimize Queries:

• Inspect and optimize slow queries to reduce their execution time.
• This will alleviate server overload and reduce the backlog of pending connections.

Additional Considerations:

• Increasing max_connections may not be an optimal solution as it can potentially exacerbate the problem.
• Consider reducing load on the database server by implementing caching mechanisms or optimizing query performance.
• Monitor Apache processes to ensure they are closing connections appropriately and not holding onto ports unnecessarily.

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