For the Professional and Enterprise plans, you are allotted monthly quotas for both Reads and Writes. At the beginning of each month, you are charged your plan’s base price. At the end of the month, if your Read or Write usage exceeds your monthly quota, then you will be charged an “overage” fee.
The overage fee is simply calculated for both Reads and Writes: overageFee = (usageGB - quotaGB) * overagePricePerGB
The usage of every row of data is measured as the sum of Avro-serialized bytes.
Avro serialization is a way to quickly and cost-efficiently transmit data across the internet. Avro uses JSON encoding to transmit the stream schema and uses binary encoding to compress and transmit the stream data.