Connection exhaustion
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
diagnose exhausted connection pools and database connection limits.
Planned topics
- Symptom: threads waiting for a connection; timeouts "unable to acquire connection".
- Causes: slow queries holding connections, leaked connections, transactions open across remote calls, a pool larger than the database can serve across all instances.
- Evidence: pool metrics (active, idle, pending), database session list showing idle-in-transaction, long-running queries.
- Fixes: shorter transactions, no remote calls inside transactions, correct pool sizing per instance times replicas, timeouts, leak detection.
Draft outline details
Demonstration
Arithmetic: 40 pods times a pool of 20 equals 800 connections against a database limit of 500. At 10× scale this becomes a failure.
Check your understanding
Why avoid remote calls inside a transaction?
Show answer
They hold a connection while waiting on something slow.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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