PDO Persistent Connection Recycling Limits for MySQL

Understanding PDO Persistent Connection Recycling Limits for MySQL Driver

0 reputation · 02 Mar 2021, 22:07 UTC

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Goal: clarify how PDO::ATTR_PERSISTENT connections are typically recycled when using the MySQL driver, and what limits govern their reuse across PHP requests.

Constraints: the recycling policy is driver‑specific and not formally documented; connection limits depend on MySQL max_connections and PHP process lifecycle; version differences may affect behavior.

What determines when a persistent connection is returned to the pool versus closed? Does the MySQL driver apply an idle timeout or request‑based limit? How can developers predict exhaustion given varying request volumes?

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Understanding PDO Persistent Connection Recycling Limits for MySQL Driver

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