Abstract: The present disclosure provides systems, methods, devices, and computer program products for cache eviction enforcement and multi-tenant distributed cache architectures and operations. Systems, methods, devices, and computer program products may access a slab of a multi-tenant caching system, perform an eviction review by sequentially reaping through the slab, based on the class size, flag a first cache item by the eviction review based on a header of the first cache item, wherein the header comprises a prefix indicative of an expiry time, confirm expiration of the first cache item via a lock and lookup operation, and evict the first cache item from the slab. Significant optimization and efficiency benefits may be realized through the slab organization, cache architectures, and operations discussed herein.

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 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 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.