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Elephant 1.0 (Alpha 2) A Persistent Object Database for Common Lisp - PowerPoint PPT Presentation

Feb 01, 2024 •413 likes •490 views

ILC09 MIT Media Lab Elephant 1.0 (Alpha 2) A Persistent Object Database for Common Lisp by Ian Eslick, MIT Media Lab also Robert Read, Alex Mizrahi, Henrik Hjelte, and Leslie Polzer, Ian Eslick, Research Assistant New Media Medicine /

  1. ILC’09 MIT Media Lab Elephant 1.0 (Alpha 2) A Persistent Object Database for Common Lisp by Ian Eslick, MIT Media Lab also Robert Read, Alex Mizrahi, Henrik Hjelte, and Leslie Polzer, Ian Eslick, Research Assistant New Media Medicine / Cognitive Machines

  2. ILC’09 MIT Media Lab Overview circa 2006 • Fully dynamic typing (blobs, not ORM) • User-visible btrees and indexes on btrees • Class slot indexing semantics • Multiple back-ends (BDB and SQL) • 5+ years of active use, primarily in commercial and academic web projects. Also games, web mining, and various research applications. Ian Eslick, Research Assistant New Media Medicine / Cognitive Machines

  3. ILC’09 MIT Media Lab Upcoming Release • Schema evolution (interesting tradeoffs!) • Expanded slot semantics • Persistent sets, duplicate-keyed btrees • Postmodern based data store – Why? Licensing and distributed operation • Simple, prevalence-style data store • Constraint-based query compiler • Garbage Collection Ian Eslick, Research Assistant New Media Medicine / Cognitive Machines

  4. ILC’09 MIT Media Lab 1.0 Release Platforms Ian Eslick, Research Assistant New Media Medicine / Cognitive Machines

  5. ILC’09 MIT Media Lab Slot Semantics in 1.0 • Transient • Persistent • Indexed: value -> instance • Derived index: (fn obj) -> instance • Associations (N:1 or N:M) • Set-valued (API issues) • Cached (checkout style caching) Ian Eslick, Research Assistant New Media Medicine / Cognitive Machines

  6. ILC’09 MIT Media Lab http://common-lisp.net/project/elephant or Google for “lisp elephant” Ian Eslick, Research Assistant New Media Medicine / Cognitive Machines

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