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By: Ahmad Yaseen Updated: 2017-07-12 Comments (1) Related: More >Performance Tuning

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Free MSSQLTips Webinar: Gathering and using historical data to solve SQL Server performance issues

In this webinar we look at how to collect and use historical data from SQL Server to help troubleshoot and solve performance problems.

Problem

Query performance tuning is a major part of the SQL Server DatabaseAdministrator's job. During this journey, you may face cases in which the SQL ServerQuery Optimizer chooses a serial plan to execute a query, although it would executemuch faster using a parallel plan. The choice made by the Query Optimizecould be due to the fact that the cost of the parallel plan is a higher thanthe serial plan cost. Is there a way to force the Query Optimizer to use a parallelplan rather than a serial plan?

Solution

Parallelism is the process of splitting a big task into multiple smaller tasksthat run simultaneously, where each task will accomplish part of the overall job.Finally, the partial results of each small task will be combined into one finalresult. You can imagine a parallel plan as multiple serial plans that run at thesame time on a separate processing unit. As a result of using a parallel plan, thequery will run much faster than the serial plan.

Before choosing to execute the query using serial or a parallel plan, the SQLServer Database Engine will check if the SQL Server instance is running on a serverthat has more than one processor. The Maximum Degree of Parallelism (MAXDOP)is configured to allow parallel plans where a MAXDOP with a value equal to 1 meansthat a serial plan will always be used to execute the query. If the MAXDOPsetting is greater than 1 or 0 (if 0 all processors will be used) and the cost of the query exceedsthe Cost Threshold of Parallelism value and the cost of the parallel planis less than the cost of a serial plan, then a parallel plan will be created andused. If the decision is taken to use a parallelplan, the SQL Server Engine detects the number of CPUs required to execute the query,called the Degree Of Parallelism (DOP), and distributes the tasks among these threadsin order to execute the query.

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In some circumstances, the SQL Server Query Optimizer chooses to execute thequery using a serial plan, rather than using a parallel plan, due to the expensivecost of the parallel plan versus the serial plan, or because the query containsscalar or relational operators that cannot be run in parallel mode. However, notall the query optimizer decisions are the best option and you may find that the query willrun faster when using a parallel plan, although the Query Optimizer chooses to usea serial plan, due to the slight difference in the cost between the serial and parallelplans. Wrong decisions may also occur due to optimizer model limitations or inaccurateinformation about the cardinality and distribution of output values provided tothe Query Optimizer.

To overcome this performance issue, you should first fix the main cause of that wrongdecision, such as making sure that the information provided to the optimizer isaccurate (such as updated statistics or a bettr written query). If you did your job and the reason why a serial planis used versus a paralleled plan is still not clear, then you need to force the use of a parallel plan within the query. In this tip, we will provide two methods to achieve that.

Example to Show Query Execution and Plan

Assume that we need to run the below SELECT query then check the time statisticsand the actual execution plan.

The Query Optimizer chooses to execute the query using a serial plan as follows.We are going to ignore the Missing Index message, so we can illustrate how theplan can differ with this query.

In addition, the query is executed within 71ms as shown in the timestatistics below.

Run Query in Parallel Using Trace Flag 8649

What about running it using a parallel plan? The first method of forcing theprevious query to use a parallel plan is enabling Trace Flag 8649, using theQUERYTRACEON query level option.

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It is clear from the below execution plan that the query will run using a parallelplan, but is it faster than the serial plan?

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Checking the time statistics of the previous query, you will clearly see thatthe query is executed within 43ms using the parallel plan, which is much fasterthan the serial plan that took 71ms. Nothing comes for free and we can see the parallelplan consumes more CPU time than the serial plan:

Run Query in Parallel Using Hint Enable Parallel Plan Preference

Starting with SQL Server 2016 SP1, the OPTION(USE HINT (’ ’)) query hint is introducedas a replacement to the OPTION(QUERYTRACEON) query hint statement without the needto have sysadmin permissions to execute and you provide the hintname without the need to remember the trace flag number. Cumulative Update 2 for SQL Server 2016SP1 comes with a new hint that is used to force the parallel plan execution fora specific query.

The previous query can be rewritten to use the newENABLE_PARALLEL_PLAN_PREFERENCE query level hint as follows.

Trying to run the previous query, an error will be raised showing that thishint is not valid in the current SQL Server version.

Checking the current SQL Server version, you will see that we are using SQL Server2016 SP1, which does not support the ENABLE_PARALLEL_PLAN_PREFERENCE hint thatwasintroduced in CU2 for SP1:

Patching the current SQL Server instance with the latest Cumulative Update, which is CU3atthe date of writing this tip and the checking the SQL Server version again.

Amazon alexa app for mac download. Now we can easily use the ENABLE_PARALLEL_PLAN_PREFERENCE query hint as shownbelow.

The query will run successfully now forcing the parallel plan execution forthe query as shown below.

Again, the time statistics shows that the parallel plan is faster than theserial plan for this query although it is more expensive due to the extra CPUtime consumed for the parallelism.

Next Steps

• Download theMicrosoft® SQL Server® 2016 SP1 Latest Cumulative Update.
• CheckSpecifying Max Degree of Parallelism in SQL Server for a Query.
• Check alsoSQL Server 2016 DBCC CHECKDB with MAXDOP.
• Read more aboutWhat MAXDOP setting should be used for SQL Server.

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