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  • Incorrect Results Caused By Adding an Index

    It’s not often that a SQL Server bug really surprises me or makes me wonder how it was never spotted before, but this is one of those. To get right into it, say you have the following two tables: CREATE PARTITION FUNCTION PF (integer) AS RANGE RIGHT FOR VALUES (1000, 2000, 3000, 4000, 5000);   ...
    Posted to Paul White: Page Free Space (Weblog) by Paul White on August 20, 2013
  • MERGE Bug with Filtered Indexes

    A MERGE statement can fail, and incorrectly report a unique key violation when: The target table uses a unique filtered index; and No key column of the filtered index is updated; and A column from the filtering condition is updated; and Transient key violations are possible Example Tables Say we have ...
    Posted to Paul White: Page Free Space (Weblog) by Paul White on December 9, 2012
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