cleanup and documentation updates

[webpac] / openisis / doc / FactSheet.txt

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-the OpenIsis database at a glance
-
-
-*      characteristics
-
--      highly flexible data structure:
-       potentially unlimited number of data fields ("columns") in record
--      highly efficient storage:
-       unused data fields consume no space
--      natural modelling - ultra fast access:
-       logically related data that would be artificially separated in
-       a relational DB is stored in a single record
--      highly flexible index structure:
-       index entries associated with a record are under full application control,
-       can even be derived from associated text documents of any format.
-
-
-*      standards
-
--      Z39.2 (IIF) based data structure
-       record structure corresponds to ANSI Z39.2
-       (ISO 2709, "Information Interchange Format")
--      Z39.50 based retrieval
-       the query language resembles Z39.50 "Type-1" queries as used by
-       all major libraries (known from WAIS and most search engines).
--      all bibliographic data models
-       like MAB and the various MARC standards can be represented in IIF
-       and thus in OpenIsis
--      XML data
-       is canonically mapped to IIF for highly efficient storage and retrieval
-
-
-*      interfaces
-
--      variety of programming languages
-       Java, Perl, Tcl, PHP, C-library for all compiler languages
--      web applications
-       using Java, Perl or PHP as wanted
--      graphical user interface
-       for Windows and Unix (incl. Mac OS X) based on Tk
--      usage in-process or as server
--      Z39.50 protocol
-       server planned using indexdata's Yaz
-
-
-*      performance
-
-benchmarks on an 800MHz Pentium III with standard IDE disk
--      100.000 records/sec
-       read in random order
--      50.000 entries/sec
-       index lookup
--      15.000 records/sec
-       write access with no index entries
--      3.000 records/sec
-       write access with ten index entries per record
-
-
-*      limits
-
-There is a choice between traditional and 21st century database formats.
--      size of data field and record
-       traditional: 32KB, 21st: no limit
--      number of records and database size
-       traditional: 16 million records of 500 MB total size, 21st: no limit.
-       logical database can span several physical databases (virtually no limit).
--      index size
-       traditional: ~1 TB, 21st: 32 TB per physical index.
-       logical index can span several physical indexes (virtually no limit).