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Tech Note: Optimizing Searches with Hashes
PRODUCT: 4D | VERSION: | PLATFORM: Mac & Win
Published On: December 22, 2005
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4th Dimension's database engine doesn’t natively support searching strings casesensitively, searching text fields completely, or searching BLOBs, picture fields, or documents at all. Hashing is a conceptually simple, well-known technique for optimizing all of these operations, in specific cases. This technical note explains what hashing is and how to apply it to various problems, including searching, document comparison, and validation check sums.

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