Displaying an Estimated Execution Plan generates CXPACKET, PAGELATCH_SH, and LATCH_EX [ACCESS_METHODS_DATASET_PARENT] waitsHow (and why) does TOP impact an execution plan?How is parallelism threshold (seconds) used if query CPU cost is actually unitlessHigh CXPACKET and LATCH_EX waitsHow does SQL Server's optimizer estimate the number of rows in a joined table?Long running query with index seekWhy is TOP operation in SQL execution planActual Query Plan Estimated Cost and dm_exec_query_stats worker time do not gelBad execution plan after stats update due to temp table100% CPU with bad execution planPlan changes to include Eager Spool causes the query to run slower

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Displaying an Estimated Execution Plan generates CXPACKET, PAGELATCH_SH, and LATCH_EX [ACCESS_METHODS_DATASET_PARENT] waits


How (and why) does TOP impact an execution plan?How is parallelism threshold (seconds) used if query CPU cost is actually unitlessHigh CXPACKET and LATCH_EX waitsHow does SQL Server's optimizer estimate the number of rows in a joined table?Long running query with index seekWhy is TOP operation in SQL execution planActual Query Plan Estimated Cost and dm_exec_query_stats worker time do not gelBad execution plan after stats update due to temp table100% CPU with bad execution planPlan changes to include Eager Spool causes the query to run slower






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








12















I'm running Microsoft SQL Server 2016 SP2-CU6 (13.0.5292.0) on a 4 vCPU VM with max degree of parallelism set to 2 and cost threshold for parallelism set to 50.



In the mornings, when trying to display an Estimated Execution Plan for a SELECT TOP 100 query, I run into massive waits and the operation to render the estimated plan takes minutes, often times in the 5 - 7 minute range. Again, this is not the actual execution of the query, this is just the process to display an Estimated Execution Plan.



sp_WhoIsActive will show either PAGEIOLATCH_SH waits or LATCH_EX [ACCESS_METHODS_DATASET_PARENT] waits and when I run Paul Randal's WaitingTasks.sql script during the operation it shows CXPACKET waits with the worker threads showing PAGEIOLATCH_SH waits:



enter image description here



*resource description field = exchangeEvent id=Port5f6069e600 WaitType=e_waitPortOpen waiterType=Coordinator nodeId=1 tid=0 ownerActivity=notYetOpened waiterActivity=waitForAllOwnersToOpen



The worker threads look to be bringing the entire stats table into memory (as those page numbers as well as subsequent page numbers shown from Paul Randal's query point back to clustered key for the stats table). Once the plan does come back, it's basically instantaneous for the remainder of the day, even after I see most of the stats table attrition from cache with only various records remaining (that I assume were pulled due to seek operations from similar queries).



I would expect this initial behavior if the query was actually executing with a plan that used SCAN operators, but why is it doing this when evaluating execution plans only to arrive at a SEEK operator as shown in the plan linked above? What can I do (aside from running this statement before office hours so my data is appropriately cached) to help improve performance here? I'm assuming a pair of covering indexes would be beneficial, but would they really guarantee any changes in behavior? I have to work within some storage and maintenance window limitations here, and the query itself is generated from a vendor solution, so any other suggestions (besides better indexing) would be welcome at this point.










share|improve this question




























    12















    I'm running Microsoft SQL Server 2016 SP2-CU6 (13.0.5292.0) on a 4 vCPU VM with max degree of parallelism set to 2 and cost threshold for parallelism set to 50.



    In the mornings, when trying to display an Estimated Execution Plan for a SELECT TOP 100 query, I run into massive waits and the operation to render the estimated plan takes minutes, often times in the 5 - 7 minute range. Again, this is not the actual execution of the query, this is just the process to display an Estimated Execution Plan.



    sp_WhoIsActive will show either PAGEIOLATCH_SH waits or LATCH_EX [ACCESS_METHODS_DATASET_PARENT] waits and when I run Paul Randal's WaitingTasks.sql script during the operation it shows CXPACKET waits with the worker threads showing PAGEIOLATCH_SH waits:



    enter image description here



    *resource description field = exchangeEvent id=Port5f6069e600 WaitType=e_waitPortOpen waiterType=Coordinator nodeId=1 tid=0 ownerActivity=notYetOpened waiterActivity=waitForAllOwnersToOpen



    The worker threads look to be bringing the entire stats table into memory (as those page numbers as well as subsequent page numbers shown from Paul Randal's query point back to clustered key for the stats table). Once the plan does come back, it's basically instantaneous for the remainder of the day, even after I see most of the stats table attrition from cache with only various records remaining (that I assume were pulled due to seek operations from similar queries).



    I would expect this initial behavior if the query was actually executing with a plan that used SCAN operators, but why is it doing this when evaluating execution plans only to arrive at a SEEK operator as shown in the plan linked above? What can I do (aside from running this statement before office hours so my data is appropriately cached) to help improve performance here? I'm assuming a pair of covering indexes would be beneficial, but would they really guarantee any changes in behavior? I have to work within some storage and maintenance window limitations here, and the query itself is generated from a vendor solution, so any other suggestions (besides better indexing) would be welcome at this point.










    share|improve this question
























      12












      12








      12








      I'm running Microsoft SQL Server 2016 SP2-CU6 (13.0.5292.0) on a 4 vCPU VM with max degree of parallelism set to 2 and cost threshold for parallelism set to 50.



      In the mornings, when trying to display an Estimated Execution Plan for a SELECT TOP 100 query, I run into massive waits and the operation to render the estimated plan takes minutes, often times in the 5 - 7 minute range. Again, this is not the actual execution of the query, this is just the process to display an Estimated Execution Plan.



      sp_WhoIsActive will show either PAGEIOLATCH_SH waits or LATCH_EX [ACCESS_METHODS_DATASET_PARENT] waits and when I run Paul Randal's WaitingTasks.sql script during the operation it shows CXPACKET waits with the worker threads showing PAGEIOLATCH_SH waits:



      enter image description here



      *resource description field = exchangeEvent id=Port5f6069e600 WaitType=e_waitPortOpen waiterType=Coordinator nodeId=1 tid=0 ownerActivity=notYetOpened waiterActivity=waitForAllOwnersToOpen



      The worker threads look to be bringing the entire stats table into memory (as those page numbers as well as subsequent page numbers shown from Paul Randal's query point back to clustered key for the stats table). Once the plan does come back, it's basically instantaneous for the remainder of the day, even after I see most of the stats table attrition from cache with only various records remaining (that I assume were pulled due to seek operations from similar queries).



      I would expect this initial behavior if the query was actually executing with a plan that used SCAN operators, but why is it doing this when evaluating execution plans only to arrive at a SEEK operator as shown in the plan linked above? What can I do (aside from running this statement before office hours so my data is appropriately cached) to help improve performance here? I'm assuming a pair of covering indexes would be beneficial, but would they really guarantee any changes in behavior? I have to work within some storage and maintenance window limitations here, and the query itself is generated from a vendor solution, so any other suggestions (besides better indexing) would be welcome at this point.










      share|improve this question














      I'm running Microsoft SQL Server 2016 SP2-CU6 (13.0.5292.0) on a 4 vCPU VM with max degree of parallelism set to 2 and cost threshold for parallelism set to 50.



      In the mornings, when trying to display an Estimated Execution Plan for a SELECT TOP 100 query, I run into massive waits and the operation to render the estimated plan takes minutes, often times in the 5 - 7 minute range. Again, this is not the actual execution of the query, this is just the process to display an Estimated Execution Plan.



      sp_WhoIsActive will show either PAGEIOLATCH_SH waits or LATCH_EX [ACCESS_METHODS_DATASET_PARENT] waits and when I run Paul Randal's WaitingTasks.sql script during the operation it shows CXPACKET waits with the worker threads showing PAGEIOLATCH_SH waits:



      enter image description here



      *resource description field = exchangeEvent id=Port5f6069e600 WaitType=e_waitPortOpen waiterType=Coordinator nodeId=1 tid=0 ownerActivity=notYetOpened waiterActivity=waitForAllOwnersToOpen



      The worker threads look to be bringing the entire stats table into memory (as those page numbers as well as subsequent page numbers shown from Paul Randal's query point back to clustered key for the stats table). Once the plan does come back, it's basically instantaneous for the remainder of the day, even after I see most of the stats table attrition from cache with only various records remaining (that I assume were pulled due to seek operations from similar queries).



      I would expect this initial behavior if the query was actually executing with a plan that used SCAN operators, but why is it doing this when evaluating execution plans only to arrive at a SEEK operator as shown in the plan linked above? What can I do (aside from running this statement before office hours so my data is appropriately cached) to help improve performance here? I'm assuming a pair of covering indexes would be beneficial, but would they really guarantee any changes in behavior? I have to work within some storage and maintenance window limitations here, and the query itself is generated from a vendor solution, so any other suggestions (besides better indexing) would be welcome at this point.







      sql-server performance sql-server-2016






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked May 6 at 20:48









      John EisbrenerJohn Eisbrener

      5,64321443




      5,64321443




















          2 Answers
          2






          active

          oldest

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          11














          It appears your request for an actual execution plan triggered stats updates. Since you mention this happens in the mornings, I imagine there's an overnight process that does a lot of modifications to the tables involved?



          Thus SQL Server uses the stats to create the plan, has hit the modification threshold, and executes automatic stats updates as part of the operation.



          In the XML for the estimated plan you shared, I see these close-together update dates for stats from this morning:



          LastUpdate="2019-05-06T09:12:49.92"
          LastUpdate="2019-05-06T09:12:58.3"
          LastUpdate="2019-05-06T09:13:20.33"
          LastUpdate="2019-05-06T09:13:09.67"
          LastUpdate="2019-05-06T09:12:59.05"
          LastUpdate="2019-05-06T09:12:39.56"


          If these are very large, busy tables (seems likely based on the sampling percentages), then it's not too surprising that the stats updates are taking a lot of horsepower.






          share|improve this answer
































            7














            When I see long estimated plan times in SSMS it's one of the following in order of likelihood:



            1. The query optimizer decided that it needed to create or update statistics.

            2. The size of the estimated plan is very large (say, >10 MB) and it simply takes SSMS a long time to display it.

            3. Query compilation itself actually took a long time due to CPU usage in looking for a good enough plan.

            4. The server is under extreme duress. For example, I might have to wait for a gateway to become available.

            5. Various bugs that lead to extremely long running compile times.

            For your situation the answer is almost certainly that SQL Server is updating or creating statistics. There are a few clues: the size of the query plan is small, the query plan is relatively simple with a low cost, and compile CPU is significantly lower than compile time:



            enter image description here



            New contributor Josh Darnell also pointed out a good clue with the last updated time for statistics in the XML.



            SQL Server 2019 introduces a new wait type, WAIT_ON_SYNC_STATISTICS_REFRESH, for when queries are waiting on stats updates. It's much easier to diagnosis this issue on that version. Until then you'll just have to rely on indirect techniques.



            Workarounds include updating statistics during a maintenance period or enabling Auto Update Stats Async for the database. Please understand the full ramifications of that option before changing it. Query plans will be created before statistics are updated instead of after statistics updates. For some workloads that can be a huge win. For others it can do more harm than good.






            share|improve this answer























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              2 Answers
              2






              active

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              2 Answers
              2






              active

              oldest

              votes









              active

              oldest

              votes






              active

              oldest

              votes









              11














              It appears your request for an actual execution plan triggered stats updates. Since you mention this happens in the mornings, I imagine there's an overnight process that does a lot of modifications to the tables involved?



              Thus SQL Server uses the stats to create the plan, has hit the modification threshold, and executes automatic stats updates as part of the operation.



              In the XML for the estimated plan you shared, I see these close-together update dates for stats from this morning:



              LastUpdate="2019-05-06T09:12:49.92"
              LastUpdate="2019-05-06T09:12:58.3"
              LastUpdate="2019-05-06T09:13:20.33"
              LastUpdate="2019-05-06T09:13:09.67"
              LastUpdate="2019-05-06T09:12:59.05"
              LastUpdate="2019-05-06T09:12:39.56"


              If these are very large, busy tables (seems likely based on the sampling percentages), then it's not too surprising that the stats updates are taking a lot of horsepower.






              share|improve this answer





























                11














                It appears your request for an actual execution plan triggered stats updates. Since you mention this happens in the mornings, I imagine there's an overnight process that does a lot of modifications to the tables involved?



                Thus SQL Server uses the stats to create the plan, has hit the modification threshold, and executes automatic stats updates as part of the operation.



                In the XML for the estimated plan you shared, I see these close-together update dates for stats from this morning:



                LastUpdate="2019-05-06T09:12:49.92"
                LastUpdate="2019-05-06T09:12:58.3"
                LastUpdate="2019-05-06T09:13:20.33"
                LastUpdate="2019-05-06T09:13:09.67"
                LastUpdate="2019-05-06T09:12:59.05"
                LastUpdate="2019-05-06T09:12:39.56"


                If these are very large, busy tables (seems likely based on the sampling percentages), then it's not too surprising that the stats updates are taking a lot of horsepower.






                share|improve this answer



























                  11












                  11








                  11







                  It appears your request for an actual execution plan triggered stats updates. Since you mention this happens in the mornings, I imagine there's an overnight process that does a lot of modifications to the tables involved?



                  Thus SQL Server uses the stats to create the plan, has hit the modification threshold, and executes automatic stats updates as part of the operation.



                  In the XML for the estimated plan you shared, I see these close-together update dates for stats from this morning:



                  LastUpdate="2019-05-06T09:12:49.92"
                  LastUpdate="2019-05-06T09:12:58.3"
                  LastUpdate="2019-05-06T09:13:20.33"
                  LastUpdate="2019-05-06T09:13:09.67"
                  LastUpdate="2019-05-06T09:12:59.05"
                  LastUpdate="2019-05-06T09:12:39.56"


                  If these are very large, busy tables (seems likely based on the sampling percentages), then it's not too surprising that the stats updates are taking a lot of horsepower.






                  share|improve this answer















                  It appears your request for an actual execution plan triggered stats updates. Since you mention this happens in the mornings, I imagine there's an overnight process that does a lot of modifications to the tables involved?



                  Thus SQL Server uses the stats to create the plan, has hit the modification threshold, and executes automatic stats updates as part of the operation.



                  In the XML for the estimated plan you shared, I see these close-together update dates for stats from this morning:



                  LastUpdate="2019-05-06T09:12:49.92"
                  LastUpdate="2019-05-06T09:12:58.3"
                  LastUpdate="2019-05-06T09:13:20.33"
                  LastUpdate="2019-05-06T09:13:09.67"
                  LastUpdate="2019-05-06T09:12:59.05"
                  LastUpdate="2019-05-06T09:12:39.56"


                  If these are very large, busy tables (seems likely based on the sampling percentages), then it's not too surprising that the stats updates are taking a lot of horsepower.







                  share|improve this answer














                  share|improve this answer



                  share|improve this answer








                  edited May 6 at 21:57

























                  answered May 6 at 21:33









                  Josh DarnellJosh Darnell

                  9,07732345




                  9,07732345























                      7














                      When I see long estimated plan times in SSMS it's one of the following in order of likelihood:



                      1. The query optimizer decided that it needed to create or update statistics.

                      2. The size of the estimated plan is very large (say, >10 MB) and it simply takes SSMS a long time to display it.

                      3. Query compilation itself actually took a long time due to CPU usage in looking for a good enough plan.

                      4. The server is under extreme duress. For example, I might have to wait for a gateway to become available.

                      5. Various bugs that lead to extremely long running compile times.

                      For your situation the answer is almost certainly that SQL Server is updating or creating statistics. There are a few clues: the size of the query plan is small, the query plan is relatively simple with a low cost, and compile CPU is significantly lower than compile time:



                      enter image description here



                      New contributor Josh Darnell also pointed out a good clue with the last updated time for statistics in the XML.



                      SQL Server 2019 introduces a new wait type, WAIT_ON_SYNC_STATISTICS_REFRESH, for when queries are waiting on stats updates. It's much easier to diagnosis this issue on that version. Until then you'll just have to rely on indirect techniques.



                      Workarounds include updating statistics during a maintenance period or enabling Auto Update Stats Async for the database. Please understand the full ramifications of that option before changing it. Query plans will be created before statistics are updated instead of after statistics updates. For some workloads that can be a huge win. For others it can do more harm than good.






                      share|improve this answer



























                        7














                        When I see long estimated plan times in SSMS it's one of the following in order of likelihood:



                        1. The query optimizer decided that it needed to create or update statistics.

                        2. The size of the estimated plan is very large (say, >10 MB) and it simply takes SSMS a long time to display it.

                        3. Query compilation itself actually took a long time due to CPU usage in looking for a good enough plan.

                        4. The server is under extreme duress. For example, I might have to wait for a gateway to become available.

                        5. Various bugs that lead to extremely long running compile times.

                        For your situation the answer is almost certainly that SQL Server is updating or creating statistics. There are a few clues: the size of the query plan is small, the query plan is relatively simple with a low cost, and compile CPU is significantly lower than compile time:



                        enter image description here



                        New contributor Josh Darnell also pointed out a good clue with the last updated time for statistics in the XML.



                        SQL Server 2019 introduces a new wait type, WAIT_ON_SYNC_STATISTICS_REFRESH, for when queries are waiting on stats updates. It's much easier to diagnosis this issue on that version. Until then you'll just have to rely on indirect techniques.



                        Workarounds include updating statistics during a maintenance period or enabling Auto Update Stats Async for the database. Please understand the full ramifications of that option before changing it. Query plans will be created before statistics are updated instead of after statistics updates. For some workloads that can be a huge win. For others it can do more harm than good.






                        share|improve this answer

























                          7












                          7








                          7







                          When I see long estimated plan times in SSMS it's one of the following in order of likelihood:



                          1. The query optimizer decided that it needed to create or update statistics.

                          2. The size of the estimated plan is very large (say, >10 MB) and it simply takes SSMS a long time to display it.

                          3. Query compilation itself actually took a long time due to CPU usage in looking for a good enough plan.

                          4. The server is under extreme duress. For example, I might have to wait for a gateway to become available.

                          5. Various bugs that lead to extremely long running compile times.

                          For your situation the answer is almost certainly that SQL Server is updating or creating statistics. There are a few clues: the size of the query plan is small, the query plan is relatively simple with a low cost, and compile CPU is significantly lower than compile time:



                          enter image description here



                          New contributor Josh Darnell also pointed out a good clue with the last updated time for statistics in the XML.



                          SQL Server 2019 introduces a new wait type, WAIT_ON_SYNC_STATISTICS_REFRESH, for when queries are waiting on stats updates. It's much easier to diagnosis this issue on that version. Until then you'll just have to rely on indirect techniques.



                          Workarounds include updating statistics during a maintenance period or enabling Auto Update Stats Async for the database. Please understand the full ramifications of that option before changing it. Query plans will be created before statistics are updated instead of after statistics updates. For some workloads that can be a huge win. For others it can do more harm than good.






                          share|improve this answer













                          When I see long estimated plan times in SSMS it's one of the following in order of likelihood:



                          1. The query optimizer decided that it needed to create or update statistics.

                          2. The size of the estimated plan is very large (say, >10 MB) and it simply takes SSMS a long time to display it.

                          3. Query compilation itself actually took a long time due to CPU usage in looking for a good enough plan.

                          4. The server is under extreme duress. For example, I might have to wait for a gateway to become available.

                          5. Various bugs that lead to extremely long running compile times.

                          For your situation the answer is almost certainly that SQL Server is updating or creating statistics. There are a few clues: the size of the query plan is small, the query plan is relatively simple with a low cost, and compile CPU is significantly lower than compile time:



                          enter image description here



                          New contributor Josh Darnell also pointed out a good clue with the last updated time for statistics in the XML.



                          SQL Server 2019 introduces a new wait type, WAIT_ON_SYNC_STATISTICS_REFRESH, for when queries are waiting on stats updates. It's much easier to diagnosis this issue on that version. Until then you'll just have to rely on indirect techniques.



                          Workarounds include updating statistics during a maintenance period or enabling Auto Update Stats Async for the database. Please understand the full ramifications of that option before changing it. Query plans will be created before statistics are updated instead of after statistics updates. For some workloads that can be a huge win. For others it can do more harm than good.







                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered May 6 at 23:29









                          Joe ObbishJoe Obbish

                          22.9k43498




                          22.9k43498



























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                              What should I write in an apology letter, since I have decided not to join a company after accepting an offer letterShould I keep looking after accepting a job offer?What should I do when I've been verbally told I would get an offer letter, but still haven't gotten one after 4 weeks?Do I accept an offer from a company that I am not likely to join?New job hasn't confirmed starting date and I want to give current employer as much notice as possibleHow should I address my manager in my resignation letter?HR delayed background verification, now jobless as resignedNo email communication after accepting a formal written offer. How should I phrase the call?What should I do if after receiving a verbal offer letter I am informed that my written job offer is put on hold due to some internal issues?Should I inform the current employer that I am about to resign within 1-2 weeks since I have signed the offer letter and waiting for visa?What company will do, if I send their offer letter to another company