/[webpac]/openisis/current/doc/FactSheet.txt
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Contents of /openisis/current/doc/FactSheet.txt

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Revision 237 - (show annotations)
Mon Mar 8 17:43:12 2004 UTC (16 years, 7 months ago) by dpavlin
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initial import of openisis 0.9.0 vendor drop

1 the OpenIsis database at a glance
2
3
4 * characteristics
5
6 - highly flexible data structure:
7 potentially unlimited number of data fields ("columns") in record
8 - highly efficient storage:
9 unused data fields consume no space
10 - natural modelling - ultra fast access:
11 logically related data that would be artificially separated in
12 a relational DB is stored in a single record
13 - highly flexible index structure:
14 index entries associated with a record are under full application control,
15 can even be derived from associated text documents of any format.
16
17
18 * standards
19
20 - Z39.2 (IIF) based data structure
21 record structure corresponds to ANSI Z39.2
22 (ISO 2709, "Information Interchange Format")
23 - Z39.50 based retrieval
24 the query language resembles Z39.50 "Type-1" queries as used by
25 all major libraries (known from WAIS and most search engines).
26 - all bibliographic data models
27 like MAB and the various MARC standards can be represented in IIF
28 and thus in OpenIsis
29 - XML data
30 is canonically mapped to IIF for highly efficient storage and retrieval
31
32
33 * interfaces
34
35 - variety of programming languages
36 Java, Perl, Tcl, PHP, C-library for all compiler languages
37 - web applications
38 using Java, Perl or PHP as wanted
39 - graphical user interface
40 for Windows and Unix (incl. Mac OS X) based on Tk
41 - usage in-process or as server
42 - Z39.50 protocol
43 server planned using indexdata's Yaz
44
45
46 * performance
47
48 benchmarks on an 800MHz Pentium III with standard IDE disk
49 - 100.000 records/sec
50 read in random order
51 - 50.000 entries/sec
52 index lookup
53 - 15.000 records/sec
54 write access with no index entries
55 - 3.000 records/sec
56 write access with ten index entries per record
57
58
59 * limits
60
61 There is a choice between traditional and 21st century database formats.
62 - size of data field and record
63 traditional: 32KB, 21st: no limit
64 - number of records and database size
65 traditional: 16 million records of 500 MB total size, 21st: no limit.
66 logical database can span several physical databases (virtually no limit).
67 - index size
68 traditional: ~1 TB, 21st: 32 TB per physical index.
69 logical index can span several physical indexes (virtually no limit).

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