In SQL Server, when talking about table partitions, basically, SQL Server doesn’t directly support hash partitions. It has an own logically built function using persisted computed columns for distributing data across horizontal partitions called a Hash partition.
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As per Wikipedia, the Halloween problem was first discovered by Don Chamberlin, Pat Selinger, and Morton Astrahan, on Halloween day, 1976.
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In SQL Server, internal latch architecture protects memory during SQL operations. It ensures the consistency of memory structures with read and write operation on pages. Rudimentarily, it has two classes, buffer latches, and non-buffer latches which perform lightweight synchronization in the SQL Engine.
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