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Db Optimizer Xe
Embarcadero® DB Optimizer™ is an automated SQL optimization tool that maximizes database and application performance by quickly discovering, diagnosing, and optimizing poor-performing SQL code.Free 14-day trial of DB Optimizer XE6. This trial version is a feature limited version of DB Optimizer with deep, native support for major DBMS platforms including Oracle, SQL Server, Sybase ASE, and IBM DB2 for LUW.Please contact your sales rep for a full-featured trial version.If you're already a DB Optimizer customer, please visit the to download the latest release.DownloadDetails.
Free MSSQLTips Webinar:Most organizations have more than one database platform, yet the challenge of finding and solving performance issues remains the same. Learn how the SolarWinds® Database Performance Analyzer (DPA) provides a unique approach to database performance management incorporating machine learning and wait-based analysis.ProblemQuery 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? SolutionParallelism 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.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 PlanAssume that we need to run the below SELECT query then check the time statisticsand the actual execution plan. Run Query in Parallel Using Hint Enable Parallel Plan PreferenceStarting 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 newENABLEPARALLELPLANPREFERENCE query level hint as follows.