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Examples include checkpointing, dynamic linking, and persistence.
As an example, a database that must be backward-compatible with previous versions of its on-disk file format, must accomplish the same type of state transformation expected of a dynamic updating system.
In the event of a failure, the hot spare would take over, and the main machine would become the new hot spare. In the event of an update, the hot spare would activate, the main system would update, and then the updated system would resume control.
The earliest true Dynamic Software Updating system is DYMOS (Dynamic Modification System).
For example, any update safety check limits the scope of updates to updates which pass that safety check.
The mechanism used to transform code and state influences what kinds of updates a system will support.
These compilers preserve the semantics of the original program, but instrument either the source code or object code to produce a dynamically updateable program.
This is because Ksplice primarily targets security changes, rather than general updates.Academic publications of DSU systems commonly include several target programs as case studies.vsftpd, Open SSH, Postgre SQL, Tor, Apache, GNU Zebra, memcached, and Redis are all dynamic updating targets for various systems.In computer science, dynamic software updating (DSU) is a field of research pertaining to upgrading programs while they are running. However, researchers have developed a wide variety of systems and techniques for implementing DSU.These systems are commonly tested on real-world programs.