Abstract: A non-transitory machine-readable storage medium stores instructions that upon execution cause a processor to, in response to a receipt of a query, communicate, via a first encrypted channel using a first key, first encrypted data between a plurality of nodes of a distributed database system, the first encrypted data comprising query metadata and a second key; communicate, via a second encrypted channel, second encrypted data between the plurality of nodes of the distributed database system, the second encrypted channel using the second key included in the first encrypted data, the second encrypted data comprising query data; and generate, by the plurality of nodes of the distributed database system, results for the query based on the query data in the second encrypted data.

Abstract: A technique includes modeling assignments of a plurality of nodes to a plurality of shards associated with a database operation based on a target throughput for the plurality of nodes. The modeling includes constraining the assignments based on an aggregate outflow from the plurality of nodes. The technique includes initializing the aggregate outflow to be less than the target throughput; and determining the assignments based on the modeling.

Abstract: A technique includes applying a first mapping to associate a plurality of data records for a plurality of database nodes with a plurality of segments of a storage that is shared by the database nodes; and applying a many-to-many second mapping to associate the segments with the database nodes.

Abstract: A non-transitory machine-readable storage medium stores instructions that upon execution cause a processor to, in response to a receipt of a query, communicate, via a first encrypted channel using a first key, first encrypted data between a plurality of nodes of a distributed database system, the first encrypted data comprising query metadata and a second key; communicate, via a second encrypted channel, second encrypted data between the plurality of nodes of the distributed database system, the second encrypted channel using the second key included in the first encrypted data, the second encrypted data comprising query data and generate, by the plurality of nodes of the distributed database system, results for the query based on the query data in the second encrypted data.

Abstract: A technique includes determining an earliest query start time associated with a plurality of queries currently being processed by a node; and based on the identified earliest query start time, selecting a version of a global catalog existing at the earliest start time. The global catalog represents objects stored in a storage shared by the node and at least one other node. The technique includes communicating the selected version of the global catalog to an object garbage collector for the storage.

Abstract: A technique includes applying a first mapping to associate a plurality of data records for a plurality of database nodes with a plurality of segments of a storage that is shared by the database nodes; and applying a many-to-many second mapping to associate the segments with the database nodes.

Abstract: A technique includes modeling assignments of a plurality of nodes to a plurality of shards associated with a database operation based on a target throughput for the plurality of nodes. The modeling includes constraining the assignments based on an aggregate outflow from the plurality of nodes. The technique includes initializing the aggregate outflow to be less than the target throughput; and determining the assignments based on the modeling.