1. A method comprising: using a first data access management system in a node cluster that comprises a plurality of nodes, each of which has access to a database; wherein the plurality of nodes includes a first set of one or more nodes and a second set of one or more nodes that is different than the first set of one or more nodes; while using the first data access management system, determining that each node in the first set of one or more nodes is to be taken offline; in response to determining that each node in the first set of one or more nodes is to be taken offline: using, in the second set of one or more nodes, a second data access management system that is different than the first data access management system to control access to data that is stored in the database; performing one or more maintenance operations on each node in the first set of one or more nodes; after performing the one or more maintenance operations, using the first data access management system in the node cluster; wherein the method is performed by one or more computing devices.