Abstract: A method of dynamic allocation of program libraries to an application server is provided. In addition to a static allocation of libraries to the server at initialization time, libraries can be added to or removed from the set available to a server while that server is active. New libraries are created as resource objects specifying a set of locations from which programs can be loaded. Each library is allocated a ranking which the system can use to identify its place in the loader's search order relative to other libraries. New library resources are dynamically installed and added to a list of available libraries, including the system's pre-defined library of locations, in a position in the loader's search order determined in accordance with the allocated ranking.

Abstract: A method of dynamic allocation of program libraries to an application server is provided. In addition to a static allocation of libraries to the server at initialization time, libraries can be added to or removed from the set available to a server while that server is active. New libraries are created as resource objects specifying a set of locations from which programs can be loaded. Each library is allocated a ranking which the system can use to identify its place in the loader's search order relative to other libraries. New library resources are dynamically installed and added to a list of available libraries, including the system's pre-defined library of locations, in a position in the loader's search order determined in accordance with the allocated ranking.

Abstract: A method of taking a backup copy of a data set, for use with a log, with the data set being open for update by multiple updaters is described. A point on the log is identified (Recovery Time) from which it can be ensured that all data updates identified on the log have been written by an updater from buffers to the data set. This is done by recording a Recovery Time, and then not taking the backup until all the updaters have confirmed that they have written all updates from buffers to the data set. In addition, if tokens are used on the log to avoid having to identify the data set in full, then these are also written to the log before the update is taken.