Method for using an index as a workspace for deferred enforcemen

Details Method for using an index as a workspace for deferred enforcemen Method for using an index as a workspace for deferred enforcemen

1998-04-06

2000-04-04

Black, Thomas G.

Data processing: database and file management or data structures

Database design

Data structure types

707 3, 702179, G06F 1730

Patent

active

060472855

ABSTRACT:
The present invention provides a uniqueness-required index and a corresponding non-uniqueness count to support deferred uniqueness constraint enforcement. A uniqueness-required index stores duplicate occurrences of indexed data values that occur during statement or transaction processing. The non-uniqueness count associated with the uniqueness-required index provides a count of the number of indexed data values that occur more than once in the index. Where a non-uniqueness count is not equal to zero, a uniqueness constraint violation remains unresolved. Where an unresolved constraint violation exists at enforcement time, the effects of the processing are removed. A currently non-unique count can be used to represent the number of uniqueness-required indexes that are "currently non-unique". The currently non-unique count can be examined to determine whether there are any unresolved uniqueness constraint violations. Constraints can be enforced at the end of the processing of a statement, a transaction, or within a transaction at a savepoint.

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