What "Knex: Timeout acquiring a connection. The pool is probably full." really means in Strapi

Knex’s “Timeout acquiring a connection” error in Strapi generally indicates that the application could not establish a database connection within the configured timeout, rather than that its connection pool is full. Troubleshooting should begin by testing database reachability from Strapi’s actual runtime environment, then checking database logs and connection limits; common causes include missing IP allowlists, incorrect firewall or security-group rules, inaccessible private networks, and Docker host misconfiguration. Strapi passes pool settings to Tarn.js through its database configuration, with recommended adjustments including setting the minimum pool size to zero in Docker or serverless deployments and sizing the maximum pool across all application replicas to fit database limits. Increasing timeout values or reducing the pool to one connection is discouraged because it can only delay failures or serialize application queries. Other relevant factors include SSL requirements, transaction-mode connection poolers such as Supabase or PgBouncer, and custom long-running code that genuinely retains connections; configuration tuning should follow confirmation that network access and actual connection exhaustion are not the underlying problem.

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