Sunday, July 20, 2008
Key Compression A technique for reducing the number of bits in keys; used in making
indexes occupy less space.
|Latency||is often used to mean any delay or waiting that increases real or perceived response time beyond the response time desired.|
|Load||After extracting, cleaning and transforming, data must be loaded into the warehouse. Additional preprocessing may still be required: checking integrity constraints; sorting; summarization, aggregation and other computation to build the derived tables stored in the warehouse; building indices and other access paths; and partitionaing to multiple target storage areas. Load utilities can be used for these operations.|
|Lockup||the event that occurs when update is done against a data base record and the transaction has not yet reached a commit point.|
|Logging||the automatic recording of data with regard to the access of the data, the updates to the data, etc.|
|Logical Representation||a data view or description that does not depend on a physical storage device or a computer program.|