SQL Server - Bulk load blocking queries on heaps

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SQL Server books online say in SET TRANSACTION ISOLATION LEVEL:




"Optimized bulk load operations on heaps block queries that are running under the following isolation levels:



SNAPSHOT



READ UNCOMMITTED



READ COMMITTED using row versioning".




What does optimized bulk load mean here exactly?






sql-server







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    up vote
    3
    down vote

    favorite












    SQL Server books online say in SET TRANSACTION ISOLATION LEVEL:




    "Optimized bulk load operations on heaps block queries that are running under the following isolation levels:



    SNAPSHOT



    READ UNCOMMITTED



    READ COMMITTED using row versioning".




    What does optimized bulk load mean here exactly?






    sql-server







    share|improve this question









    New contributor




    yurish is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





















      up vote
      3
      down vote

      favorite









      up vote
      3
      down vote

      favorite











      SQL Server books online say in SET TRANSACTION ISOLATION LEVEL:




      "Optimized bulk load operations on heaps block queries that are running under the following isolation levels:



      SNAPSHOT



      READ UNCOMMITTED



      READ COMMITTED using row versioning".




      What does optimized bulk load mean here exactly?






      sql-server







      share|improve this question









      New contributor




      yurish is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      SQL Server books online say in SET TRANSACTION ISOLATION LEVEL:




      "Optimized bulk load operations on heaps block queries that are running under the following isolation levels:



      SNAPSHOT



      READ UNCOMMITTED



      READ COMMITTED using row versioning".




      What does optimized bulk load mean here exactly?






      sql-server




      sql-server






      share|improve this question









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      yurish is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      share|improve this question









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      edited 1 hour ago









      Kin

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          Optimized bulk load means SQL Server is using a special bulk load code path (fast load) and minimal logging.



          These concepts are described in:



          • SQL Server 2016, Minimal logging and Impact of the Batchsize in bulk load operations

          • Prerequisites for Minimal Logging in Bulk Import

          • The Data Loading Performance Guide

          From that last link:




          Although readers under RCSI are not affected by X locks, there are two bulk load situations that will block RCSI queries (as well as NOLOCK queries) in SQL Server 2008:



          • When populating a heap with TABLOCK using BULK INSERT, INSERT-SELECT, or other bulk load operations. This is because the heap load acquires a BULK OPERATION intent exclusive (IX) lock and the NOLOCK or RCSI readers acquire a BULK OPERATION shared (S) lock. To bulk load a heap and permit concurrent readers even using RCSI or NOLOCK, you must eliminate the TABLOCK hint and thus give up minimal logging.






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            1 Answer
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            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes








            up vote
            5
            down vote



            accepted










            Optimized bulk load means SQL Server is using a special bulk load code path (fast load) and minimal logging.



            These concepts are described in:



            • SQL Server 2016, Minimal logging and Impact of the Batchsize in bulk load operations

            • Prerequisites for Minimal Logging in Bulk Import

            • The Data Loading Performance Guide

            From that last link:




            Although readers under RCSI are not affected by X locks, there are two bulk load situations that will block RCSI queries (as well as NOLOCK queries) in SQL Server 2008:



            • When populating a heap with TABLOCK using BULK INSERT, INSERT-SELECT, or other bulk load operations. This is because the heap load acquires a BULK OPERATION intent exclusive (IX) lock and the NOLOCK or RCSI readers acquire a BULK OPERATION shared (S) lock. To bulk load a heap and permit concurrent readers even using RCSI or NOLOCK, you must eliminate the TABLOCK hint and thus give up minimal logging.






            share|improve this answer
























              up vote
              5
              down vote



              accepted










              Optimized bulk load means SQL Server is using a special bulk load code path (fast load) and minimal logging.



              These concepts are described in:



              • SQL Server 2016, Minimal logging and Impact of the Batchsize in bulk load operations

              • Prerequisites for Minimal Logging in Bulk Import

              • The Data Loading Performance Guide

              From that last link:




              Although readers under RCSI are not affected by X locks, there are two bulk load situations that will block RCSI queries (as well as NOLOCK queries) in SQL Server 2008:



              • When populating a heap with TABLOCK using BULK INSERT, INSERT-SELECT, or other bulk load operations. This is because the heap load acquires a BULK OPERATION intent exclusive (IX) lock and the NOLOCK or RCSI readers acquire a BULK OPERATION shared (S) lock. To bulk load a heap and permit concurrent readers even using RCSI or NOLOCK, you must eliminate the TABLOCK hint and thus give up minimal logging.






              share|improve this answer






















                up vote
                5
                down vote



                accepted







                up vote
                5
                down vote



                accepted






                Optimized bulk load means SQL Server is using a special bulk load code path (fast load) and minimal logging.



                These concepts are described in:



                • SQL Server 2016, Minimal logging and Impact of the Batchsize in bulk load operations

                • Prerequisites for Minimal Logging in Bulk Import

                • The Data Loading Performance Guide

                From that last link:




                Although readers under RCSI are not affected by X locks, there are two bulk load situations that will block RCSI queries (as well as NOLOCK queries) in SQL Server 2008:



                • When populating a heap with TABLOCK using BULK INSERT, INSERT-SELECT, or other bulk load operations. This is because the heap load acquires a BULK OPERATION intent exclusive (IX) lock and the NOLOCK or RCSI readers acquire a BULK OPERATION shared (S) lock. To bulk load a heap and permit concurrent readers even using RCSI or NOLOCK, you must eliminate the TABLOCK hint and thus give up minimal logging.






                share|improve this answer












                Optimized bulk load means SQL Server is using a special bulk load code path (fast load) and minimal logging.



                These concepts are described in:



                • SQL Server 2016, Minimal logging and Impact of the Batchsize in bulk load operations

                • Prerequisites for Minimal Logging in Bulk Import

                • The Data Loading Performance Guide

                From that last link:




                Although readers under RCSI are not affected by X locks, there are two bulk load situations that will block RCSI queries (as well as NOLOCK queries) in SQL Server 2008:



                • When populating a heap with TABLOCK using BULK INSERT, INSERT-SELECT, or other bulk load operations. This is because the heap load acquires a BULK OPERATION intent exclusive (IX) lock and the NOLOCK or RCSI readers acquire a BULK OPERATION shared (S) lock. To bulk load a heap and permit concurrent readers even using RCSI or NOLOCK, you must eliminate the TABLOCK hint and thus give up minimal logging.







                share|improve this answer












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                answered 19 mins ago









                Paul White♦

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