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Symptom

The client gets an exception similar to: 
ReplyError: ERR max requests limit exceeded.

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Diagnosis

Your database exceeds the max monthly request count limit.

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Solution-1

You can refactor your application to send less number of commands.

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Solution-2

You can upgrade your database to a paid plan, such as pay-as-you-go or a fixed plan by entering a payment method. When you entered your credit card, your database will be upgraded automatically. See here for more information.