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Microsoft have documented this trace flag here and here.Let’s enable the trace flag: Now, re-issue the same update statistics commands and take a look at the locks/blocks using the same methods as before: The sp_Who Is Active stored procedure output above shows that there is no blocking now.Querying sys.dm_tran_locks reveals similar information: SELECT request_session_id, resource_type, resource_subtype, resource_description, request_status, request_mode FROM sys.dm_tran_locks WHERE request_session_id IN (56,57) AND request_owner_type != 'SHARED_TRANSACTION_WORKSPACE' ORDER BY request_session_id The output above again shows the exclusive (X) lock taken on the OBJECT.Sales Order Detail Enlarged (IX_Sales Order Detail Enlarged_Product ID) WITH FULLSCAN; The output above shows that the second update statistic operation issued by session 57 is being blocked by session 56.
Previously, an exclusive (X) lock was acquired on the OBJECT.
Microsoft’s recommended best practice is to only use TF 7471 during dedicated maintenance windows due to the fact that it increases the possibility of deadlocks.
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We investigate the viability of implementing QR updating algorithms on GPUs and demonstrate that GPU-based updating for removing columns achieves speed-ups of up to 13.5× compared with full GPU QR factorization.
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