The LMOS database is a proprietary file system, designed with 11 access methods (variable index, index, hash tree, trie, fixed partition file, etc). This is highly tuned for the various pieces of data used by LMOS.
LMOS, which was first brought on line as a mainframe application in the 1970's, was one of the first telephone company operations support systems to be ported to the UNIX operating system(tm). The first port of LMOS was to Digital Equipment Corporation's PDP 11/70 machines and was completed in 1981. Later versions used VAX 11/780's. Today, LMOS runs on HP-UX 11i systems. See also Operations support systems
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