Abstract: Systems and methods include determination of a plurality of artifacts of a first data schema and a first view schema of a first database version to be updated in a second database version, determination of target structures of a plurality of runtime objects for the second database version based on the artifacts, and loading of current structures of the runtime objects into a runtime buffer of a first work process connected to the first view schema. While the first work process serves first incoming requests using the runtime buffer and the first view schema, the runtime objects are updated to the determined target structures in the first data schema and in a second view schema of the second database version, a second work process is connected to the second view schema, and the second work process serves second incoming requests, the second view schema and the updated first data schema.

Abstract: A zero downtime upgrade procedure is initiated that upgrades a first version of software executing on a source system comprising at least one source server to a second version of software executing on a target system comprising at least one target server. The source system initially starts operating in a read-write mode. Thereafter, concurrent with the operation of the source system, operation of the target system is initiated in a read-only mode. Operations of the source system are then ceased by ramping down activities of the source system. Upon cessation of operation of the source system, operation of the target system is initiated in a read-write mode.

Abstract: A zero downtime upgrade procedure is initiated that upgrades a first version of software executing on a source system comprising at least one source server to a second version of software executing on a target system comprising at least one target server. The source system initially starts operating in a read-write mode. Thereafter, concurrent with the operation of the source system, operation of the target system is initiated in a read-only mode. Operations of the source system are then ceased by ramping down activities of the source system. Upon cessation of operation of the source system, operation of the target system is initiated in a read-write mode.