Tail compression of a sparse log stream of a multisystem environ

Details Tail compression of a sparse log stream of a multisystem environ Tail compression of a sparse log stream of a multisystem environ

1997-03-28

1999-12-07

Kulik, Paul V.

Data processing: database and file management or data structures

Database design

Data structure types

707202, G06F 1200

Patent

active

059999357

ABSTRACT:
A multisystem log stream of a multisystem environment is compressed. The oldest record needed for each system that can write or delete entries from the multisystem log stream is tracked, and that information is used in compression of the log stream. The block ids associated with those oldest records are maintained within a vector, and when the vector is updated, a determination is made as to whether the entry in the vector that it replaced previously contained the lowest block id in the vector. If so, all the records having block ids lower than the new lowest block id in the vector are deleted.

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