1. A system for prioritizing capacity consumption of a database management system, the system comprising: one or more computing nodes configured to operate the database management system; and one or more memories having stored thereon computer readable instructions that, upon execution, cause the system at least to: receive a request to perform an operation on the database management system, the request comprising information indicative of a request class, the operation to be performed on behalf of a customer; select a first token bucket from one or more data structures comprising a plurality of token buckets, the selection based at least in part on the request class, the first token bucket having an associated first capacity indicator; determine that the first capacity indicator is indicative of a capacity to perform the operation on behalf of the customer; perform the operation; and update the first capacity indicator based at least in part on capacity utilized by performing the operation.