lambda-DB version 1.8 is an object-oriented database management system
built on top of SHORE 1.1.1. It
supports ODMG ODL specifications and can handle most ODMG OQL queries
(but it is not fully ODMG-compliant yet).
Note that lambda-DB is not supported anymore. We currently support LDB, which is based on SHORE 2.0.
Please send your comments and report any bugs to email@example.com.
- The front-end:
- can handle most ODL declarations;
- can process most OQL queries;
- supports embedded OQL in C++ with very low impedance mismatch;
- supports execution of ad-hoc OQL queries at run-time;
- provides a visual query formulation interface;
- supports transactions, updates, index creation & maintenance, macros, functions, and methods with OQL body;
- extends OQL with XPath syntax to query XML data.
- The query optimizer:
- unnests all nested (correlated) queries;
- can materialize path expressions into pointer joins;
- performs semantic optimizations using ODL relationships;
- uses a cost-based polynomial-time heuristic for join ordering;
- uses a rule-based cost-driven optimizer to produce physical plans.
- The query evaluator:
- has two modes: translates evaluation plans into C++ code at compile-time or interprets the plans at run-time;
- supports stream-based processing (it materializes streams only when necessary);
- supports many evaluation algorithms, including
sorting, block nested loop, indexed nested loop, pointer join, and sort-merge join;
- supports the creation, maintenance, and use of indexes.
- Overview: Everything you always wanted to know about lambda-DB but were afraid to ask.
- Installation Manual: How to install lambda-DB.
- User's Manual: How to use lambda-DB.
- Voodoo Manual: The visual query formulation for lambda-DB.
- System Manual: If you want to understand the internals and extend the system.
- Status: Current status, bugs, problems, and to-do list.
Copyright © 1999-2002 by Leonidas Fegaras, the University of Texas at
Arlington. All rights reserved.
This material is provided as is, with absolutely no warranty expressed
or implied. Any use is at your own risk.
Permission is hereby granted to use or copy this program for any
purpose, provided the above copyright notice is retained on all copies.
See the README file in the distribution for more details.
This work was supported in part by the National Science Foundation
under grant IIS-9811525. The theoretical framework of this system
was developed by Leonidas Fegaras and David Maier. The implementation
was done by Leonidas Fegaras and by UTA students.
Last modified: 8/8/02 by Leonidas Fegaras