About: Aldat (deleted 05 Mar 2008 at 23:17)   Sponge Permalink

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Computer memory comes in a variety of forms, two principle ones being primary memory ("RAM"), and secondary memory ("SS") which includes hard and floppy disks and CD-ROM. Data structures and languages for RAM are core computer science. The Aldat Project is concerned with language and data structures for SS. Secondary storage is distinguished from RAM primarily by the long times required to find data, relative to the times required to transfer it for processing. Different memory organization needs different data structures, algorithms and languages. There are many general-purpose languages for RAM and it is unusual to encounter languages specialized for individual applications. Languages for SS are usually query languages rather than full programming languages, and they are specialized

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  • Aldat (deleted 05 Mar 2008 at 23:17)
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  • Computer memory comes in a variety of forms, two principle ones being primary memory ("RAM"), and secondary memory ("SS") which includes hard and floppy disks and CD-ROM. Data structures and languages for RAM are core computer science. The Aldat Project is concerned with language and data structures for SS. Secondary storage is distinguished from RAM primarily by the long times required to find data, relative to the times required to transfer it for processing. Different memory organization needs different data structures, algorithms and languages. There are many general-purpose languages for RAM and it is unusual to encounter languages specialized for individual applications. Languages for SS are usually query languages rather than full programming languages, and they are specialized
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abstract
  • Computer memory comes in a variety of forms, two principle ones being primary memory ("RAM"), and secondary memory ("SS") which includes hard and floppy disks and CD-ROM. Data structures and languages for RAM are core computer science. The Aldat Project is concerned with language and data structures for SS. Secondary storage is distinguished from RAM primarily by the long times required to find data, relative to the times required to transfer it for processing. Different memory organization needs different data structures, algorithms and languages. There are many general-purpose languages for RAM and it is unusual to encounter languages specialized for individual applications. Languages for SS are usually query languages rather than full programming languages, and they are specialized both to particular data structures (hierarchies, linked lists, tables, etc.) and to particular applications (administrative data, spatio-temporal data, logic data, semistructured data, etc.) For instance, RAM has no spatio-temporal dialect of FORTRAN or Java, but SS has Arc-Info while commercial relational databases (SS) do not have comparable spatial capability except as add-ons. Aldat is a general purpose SS programming language developed at McGill University. This development has been empirical, following and sometimes leading the main thrusts of database research (including hierarchies, data-structure-set, multiset relations, entities and relationships, object-oriented databases, logic databases, active databases, data warehousing, data mining, semistructured data, and Internet data) with the aim of including all the evolving possibilities of SS programming. The difficulties of doing this are captured in the phrase "impedance mismatch", which characterizes the gaps among applications on one hand and between querying and programming on the other. Aldat is a relational programming language which includes all query capabilities of commercial relational database systems, as well as general programming. The language and data abstractions with which Aldat accommodates SS also turn out to be valuable in programming for RAM, and so has benefits for all computer science.
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