Database system implementation of a plurality of operating system layers

A database system, comprising:

• a plurality of computing devices of at least one sub-system of the database system, wherein each of the plurality of computing devices comprises:
• a plurality of nodes;
• and
• a plurality of operating system layers that comprises:
• a local database operating system, wherein the plurality of nodes of the each computing device utilize the local database operating system of the each computing device to execute at least one database operation independently of other ones of the plurality of nodes;
• and
• a sub-system database operating system, wherein the plurality of nodes of the plurality of computing devices collectively utilize the sub-system database operating system to collectively execute at least one sub-system operation of the at least one sub-system.