What should I check first when MongoDB fails?

Question

A failure needs to be narrowed down before settings are changed or operations retried. Which evidence best separates application errors from environment and dependency problems?

Tasadduq Burney · Accepted Answer

Check server logs, driver errors, replica-set health and the selected read/write concern. Distinguish an unavailable primary from a slow query. Inspect connection-pool behavior and recent index or schema changes before raising timeouts that merely hide the underlying failure.

What should I check first when MongoDB fails?

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Your perspective belongs here.

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