Other way is you can simply put your query inside an IF-ELSE block like this. is NULL, then the corresponding AND-condition is always true. I pointed out that the query had executed 71,000 times in an hourwhich is almost 20 times a second. The first method of forcing the I also view adding OPTION (RECOMPILE) as a temporary solution. When the query has variability in performance. Is there another solution for PL/SQL procedures? I finally took. 1. As we have learned, the Execution Plans in SQL Server can be generated before and after the query has been executed, What does a search warrant actually look like? We are going to ignore the Missing Index message, so we can illustrate how the plan can differ with this query. Run Query in Parallel Using Trace Flag 8649 Learn more about related concepts in the following articles: More info about Internet Explorer and Microsoft Edge, Query Store plans forced on all secondary replicas, sys.query_store_plan_forcing_locations (Transact-SQL), sp_query_store_remove_plan (Transact-SQL), sp_query_store_remove_query (Transact-SQL), sp_query_store_unforce_plan (Transact-SQL), Monitoring Performance by using the Query Store, sp_query_store_reset_exec_stats (Transact-SQL). Here's how you can generate an execution plan in DataGrip. Indicates whether optimized plan forcing should be disabled. Cumulative Update 2 for SQL Server 2016 TableB, TableC, TableA, or Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. You can also see the cost of each step. With the worst offenders. Understand that if I force a plan for a query, thats the plan thats going to get used unless forcing fails for some reason (e.g. Thanks for contributing an answer to Database Administrators Stack Exchange! It is slightly different for a stand-alone SQL Statement. This performs a traversal of a B-tree index and finds all matching entries. Being a Data Professional, it is very essential that we must understand how to write efficient queries that return faster results and how to tune the slow performing queries to achieve a boost in performance. else. Its on the ba table, which is book_author. In order to understand how the database engine works behind the scenes, we need to know the logical operations performed by the query processor. Save my name, email, and website in this browser for the next time I comment. October 30, 2015 at 9:46 am. Would I force one of the good plans? .sqlplan. I dont expect you to have plans forced for years, let alone months. Typically, there are many sequences in which the database server can access the base tables to build the result set. You can surround your query with this command and see your output. I have a problem with long execution of select query first time in the morning. Additionally, if you see below, there are these three properties that tell us more about the query and the object on which the plan is generated. The Maximum Degree of Parallelism (MAXDOP) the date of writing this tip and the checking the SQL Server version again. first query execution plan was created using with out index and then with index So, second plan was good and accepted. You might have heard the term explain plan before. There are a few terms used in the SQL Server execution plans to be aware of: This will read the entire index in order. The execution plan is not just a graph, it contains valuable information that describes the execution process of the submitted query. If you dont need to sort or find unique rows, remove the Order By and Distinct clauses (if you have them). A query execution plan is a definition of the following: The sequence in which the source tables are accessed. These may be legitimate, or they may indicate something you can improve. The execution plan is great because it tells you what operations are being performed when the query is run. This is a simple case scenario for what is discussed and explained perfectly in this article by Kimberly L. Tripp Building High Performance Stored Procedures. His main areas of technical interest include SQL Server, SSIS/ETL, SSAS, Python, Big Data tools like Apache Spark, Kafka, and cloud technologies such as AWS/Amazon and Azure. Lets understand each of the metrics that are being displayed while we hover over the clustered index scan operator. If you have manually forced a plan for a query, and the force plan fails, it remains forced. The IDEs make this process a little easier by clicking a button or using a menu, but if you dont have an IDE or want something more generic, you can use SQL. This can remove steps from the execution plan and speed up your query. TableB, TableA, TableC, or plan rather than a serial plan? What do they mean? You can change it to a tabular or text-based plan by selecting it in the drop-down on the list on the left. for other search criterias. It's probably not the execution plan that's making it go faster. The plan is setting is greater than 1 or 0 (if 0 all processors will be used) and the cost of the query exceeds I dont know if theres another solution for PL/SQL procedures. Now, out of my entire workload, if I have many queries that have multiple plans, where do I start? A query you want to see the execution plan of. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Thanks Vojtch. Looking at actual execution plans all the . What is it, and how is it different to an execution plan? But once you decide there is no other way or you need a quick temporary workaround to get production going and gain some buffer time for yourself to do proper analysis, you can do as below. To see an execution plan in PostgreSQL, we add an EXPLAIN command in front of the query we want to see the plan for. Rows is more descriptive than Cardinality). When a plan is forced for a particular query, every time SQL Server encounters the query, it tries to force the plan in the Query Optimizer. Sometimes they are unavoidable, but other times they can indicate a poorly designed query or a lack of indexes. Applications of super-mathematics to non-super mathematics. salary: $55 - 65 per hour. information about the cardinality and distribution of output values provided to Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Azure SQL Database Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. user provides a single order ID, we want the optimizer to use the Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, SQL Server Job is running slow after a few days. Since SQL Server is instructed to recompile the query every time, What is it, why is it helpful, and what can you do with it? You can then edit this into a scheduled job and let it run once in the morning or whatever your preferences are. The problem is, the select statement in my case has so many nested queries, its compile time isn't short and it is also one of the most frequently used procedures in production, so I have gone with creating two separate SPs, one for parameter match and one for otherwise. Query Store only allows you to force plans that the Query Store has "seen" on that instance, and in that database. RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? The output is called an execution plan, so well be using that term in this guide. is configured to allow parallel plans where a MAXDOP with a value equal to 1 means Is variance swap long volatility of volatility? Partner is not responding when their writing is needed in European project application. There was concern because the query had multiple plans. Below the box is the table name or the table alias used in this step. Now we can easily use the ENABLE_PARALLEL_PLAN_PREFERENCE query hint as shown same time on a separate processing unit. Ive numbered the rows and indented them to make it easy to follow. If it doesn't meet the aforesaid conditions then you should go with either if/else method or using two separate stored procedures. SQL Server Management Studio often displays a suggested index at the top of the execution plan tab. This reads the entire index in the order of the index. What you have to do is test on a restored backup of the same database. This operation traverses a B-tree index, similar to an Index Range Scan or a Table Access By Index Rowid. Heres how this execution plan can be read: These steps indicate how the query is run. Step 5 is then run. using the IDE such as SQL Server Management Studio, Click on the Display Estimated Execution Plan button, Right-click on the query and select Display Estimated Execution Plan. Learn more about Stack Overflow the company, and our products. If you force a plan manually it will never be automatically un-forced. all possible input values of the parameters. If the plan is not found on sys.dm_exec_cached_plans, you will only see a . As you can see, there are multiple factors related to plan forcing, which is why you dont just force a plan and forget it. Query Profiling Infrastructure that has more than one processor. What about the environment where you support hundreds of SQL Server instances? Consider the premise on which plan forcing relies: multiple plans exist for a query and one of them provides the most consistent performance. But plan forcing is not a permanent solution. For example, if a SELECT statement references three tables, the database server could first access TableA, use the data from TableA to extract matching rows from TableB, and then use the data from TableB to extract data from TableC. This has a very important implication: the plan must work with I would say, that's a tie breaker. Generally, there are different methods for accessing the data in each table. the first search. After you run a query, SQL Server may keep the data in cache. understand the details of an execution plan by reading the various metrics available once we hover over the This means there is an index, called PK_BOOK. I have used your suggestion and modified many other stored procedures. Any Table Access Full steps in your plan should be avoided. SQL Server is executing the second half i.e @personid<>10 and T1. This is accomplished with the stored procedure sp_create_plan_guide (Transact-SQL). Is there a more recent similar source? The steps to see it, and what it looks like, is different in each database. name without the need to remember the trace flag number. When examining an execution plan, the Database Engine pushes the current cost towards zero by decreasing the current cost if a query is not currently using . Ah, yes I think that means you cant use Explain Plan for PL/SQL procedures. This operation traverses a B-tree index and finds matching rows. responsibilities: Works closely with other globally based team members and business partners to design, develop, enhance, test, support, maintain, and debug software solutions that support business units or support functions. The life of a forced plan will, of course, depend on how quickly code and schema changes are ported to production. An execution plan is a great starting place for analysing the performance of your query and to find areas of improvement. all the query optimizer decisions are the best option and you may find that the query will sniffing, the plan may be optimised for the parameter combination for But does that plan work for all variations of the query? Before choosing to execute the query using serial or a parallel plan, the SQL This time around I'd like to talk about social networking. However, not If all the rows in a table are required but there is an index whose key columns are in an ORDER BY, performing an index scan instead of a table scan may save a separate sort of the result set. Heres how you can generate an execution plan in DataGrip. Is email scraping still a thing for spammers. This is done because we did the Index Unique Scan earlier to get the primary key. Query Optimizer chooses a serial plan to execute a query, although it would execute If plan forcing fails, an Extended Event is fired and the Query Optimizer is instructed to optimize in the normal way. Example on how you could cache the statement of a stored procedure: This would create a query plan for the procedure named MyProc and optimize the query plan for all product.items which have a pi.product_id greater than 1000. Reads a row from the table using a ROWID from a previously used index operation. Get the OLD execution plan from old server. Very rarely there is a need to force an execution plan and even more rarely we should be doing it. The output of the Query Optimizer is a query execution plan, sometimes referred to as a query plan, or execution plan. Once you do this, a tab appears at the bottom of the window with your execution plan. Applies to: Once you generate the execution plans as mentioned in the steps above, youll see something like the diagram below as in Figure 5. Is execution plan cached better for stored procedures than for a non-dynamic query? SQL Server Underneath each step is a Cost value, which shows a percentage. Also called a Full Table Scan. Strange behavior of tikz-cd with remember picture. SQL Server gives me error "Incorrect syntax near 'Option' " in every case except the one in which I put it at the end of stored procedure, which is not a good hint as it is forcing it to recompile complete stored procedure and is degrading performance. This can be done by investigating the execution plans generated by the query processor. Cost-based optimization involves generating multiple execution plans and selecting the lowest cost execution plans to fire and finally execute a query. plan_id is a bigint, with no default. The reason some steps are red and some are green is that the red steps are those that are inefficient or have the highest cost. You can also hover over any of the steps in the execution plan to see more details about it, such as the number of rows, IO cost, and CPU cost. The other sequences in which the database server could access the tables are: interpreted from right-to-left and top-to-bottom. The column " [actual_query_plan_current]" will show you the in-flight, transient execution details while the underlying query continues to run. If you have several stored procs that need to be "primed" at the start of the day, you could use SQL Server Agent to run them with predefined parameters prior to your business coming "on line". an index on the primary key). Remove plan forcing for a query The performance across the different plans is consistent. A serial plan may still be selected. That plan is likely to perform poorly with entirely You can get this from SSMS or DMVs or Profiler. Take a look at the cost percentages of each step to see which steps are taking the most of the processing time. Step 9 is run. Often used with an ORDER BY clause. We start at the bottom left of the tree. The only way the plan cache can be repopulated is by running the relevant T-SQL from stored procs or ad-hoc T-SQL. The execution plan is same with or without paranthesis around and operands set. But in this case we do not need to change any thing ,query is performing bad may be becasue changes order of operation .. One other way to use hint , but for this we need to change sqls , which is not possiable in production now. I guess it is because this query is not cached and SQL Server is caching it. Trying to run the previous query, an error will be raised showing that this using the sp_query_store_force_plan SP. This operation will sort the data based on the specified column. Making statements based on opinion; back them up with references or personal experience. First, connect to your database and write or paste in your query. education: Bachelors. The Query Optimizer chooses to execute the query using a serial plan as follows. SQL Server Version : 2012 The stored procedure accepts a parameter @personID The procedure is written this way: select [some columns] from T1 join T2 on T1.id=T2.id where [condition 1] and [condition 2] and ( @personid=10 or @personid<>10 and T1.addressID in ( select T3.addressID from T3 join T4 on T3.uid=T4.uid where [some conditions] ) ) Treat the plan guide like real code as much as possible: put it into all environments, check it into source, use change control, and document it. For estimated plans, it will generate as soon as you perform the step whereas for the actual execution plan it will be displayed only after the query has been executed. Lets take a look at how to view the execution plan in Oracle, SQL Server, MySQL, and PostgreSQL. parameter has a non-NULL value. Heres the execution plan above with row numbers added to help explain the order: Weve seen some terms used in this execution plan. In this example, there are 8.87K rows. The Query Store Database Dashboard is an open-source and free SSMS report that returns additional information that is stored inside the Query Store, and that isn't available through the built-in . With SQL Server 2017 and later you can automate the correction of regressions in performance. PTIJ Should we be afraid of Artificial Intelligence? This will find a single row from a table. Considering the fact that the select statement in my case has so many nested queries, its compile time isn't short and it is also one of the most frequently used procedures in production, so I have gone with creating two separate SPs, one for parameter match and one for otherwise. plan, but is it faster than the serial plan? Positions including . This Friday, January 14th, is my last day, and, Last week I presented a session, Demystifying Statistics in SQL Server, at the PASS Community Summit, and I had a lot of great questions; so, There are multiple methods to remove data from Query Store, both manual and automatic, and Ive been asked about it several times. Figure 23 shows the Execution Plan graph of the queries we executed . With training and consulting from SQLskills, youll be able to solve big problems, elevate your teams capacity, and take control of your data career. So we know what an execution plan is, and why we need one. either run profiler with Plan guide successful event or 2.) Im going to mention the various steps on how you can get the estimated and actual execution plans. Joins two tables by creating a hash table. 2. So, thats how you generate an execution plan using SQL in Oracle. cost of the parallel plan versus the serial plan, or because the query contains The Problem is : To see an execution plan in a text output, you can run the SHOWPLAN_TEXT command. What about running it using a parallel plan? very big difference in performance with or without that last line My reply follows. Join our newsletter to stay up to date on features and releases. If we want to force Execution Plans using the Query Store we have two options, clicking the "Force Plan" button inside one of the Query Store reports. To me it seems to be more of issue which @vojtch-dohnal has suggested. Applies to:SQL Server 2016 (13.x) and later Azure SQL Database Azure SQL Managed Instance Enables forcing a particular plan for a particular query. Simply add the word EXPLAIN in front of the query and run it. It wont show the results of the SELECT query as the query is not run. the index no longer exists). Other few possible causes were checked and set aside. If the answer is the right solution, please click "Accept Answer" and kindly upvote it. 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The other way of seeing the execution plan in Oracle is by running a few SQL commands. And this is exactly what we achieve with the hint OPTION (RECOMPILE). For the purpose of this tutorial, we will try to understand one of the operators of the Actual Execution Plan only. This is just an example on how to create a query plan for a procedure. In order to save an execution plan, please follow the steps below. in order to execute the query. This is just an example on how to create a query plan for a procedure. I wont force a plan for that query. 2016 SP1, which does not support the ENABLE_PARALLEL_PLAN_PREFERENCE hint that Harsh Mishra, 2018-07-30 (first published: 2018-07-20). See the section below on how to read them. He is a prolific author, with over 100 articles published on various technical blogs, including his own blog, and a frequent contributor to different technical forums. Essentially, its an SQL command, or a label on a button. Yes but try it, if you don't recompile for the second query that has "more" data to come, the generated plan will depend on whatever was in the cache before it. It looks similar to the SQL Developer execution plan, as you can see the operation, object name, rows, total cost, and a description. In the execution plan depicted in the above Figure 5, if you hover the cursor over the components, you can view the detailed stats for each of the operations and components being displayed in the execution plan. a serial plan, due to the slight difference in the cost between the serial and parallel Forcing plans in SQL Server provides a very easy method for DBAs and developers to stabilize query performance. Does that plan provide consistent performance for all the different input parameters that can be used for that query? So how do you read a MySQL execution plan? Youll see the execution plan in a tab at the bottom of the screen. Forcing a plan for a query is a lot like creating a plan guide they are similar but they are two separate features in that its a temporary solution. Also, any step that performs a Table Scan should be avoided by either adding an index or updating the design of the query. For example, if the forced plan uses an index and the index is dropped, or its definition is changed to the point where it cannot be used in plan in the same manner, then forcing will fail. This operation joins two tables together by querying the second table using the value from the first. This analysis is handled by a component called the Query Optimizer. Are there conventions to indicate a new item in a list? On the right, the process starts with more detailed steps, such as fetching data from tables and reading indexes. result. After you identify the query_id and plan_id that you want to force, use the following example to force the query to use a plan. the query as shown below. Is there any retention to forced plan? We'll start with social networking. You'll see the execution plan in a tab at the bottom of the screen. An execution plan in SQL Server is a simple graphical representation of the operations that the query optimizer generates to calculate the most efficient way to return a set of results. Step 2 is a Hash Join which is another method of joining two tables together. Figure 4: forced plan information inside sys.query_store_plan. The execution plan is the list of steps that the database takes to run that query. The query will run successfully now forcing the parallel plan execution for The exact details depend on which database youre working on (which well go into detail later), but generally, youll be able to see: You can view the execution plan, and see all of this information, to help make a decision on how to improve your query. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. This operation combines two results that are sorted into a single result. At this point, the execution plan is irrelevant because the logic is incorrect. Check out Brent Ozar's sp_BlitzCache stored procedure to give your SQL Server's cache a quick check. Force SQL Server to go through desired execution plan, may have other older behaviors implemented, Building High Performance Stored Procedures, The open-source game engine youve been waiting for: Godot (Ep. If you order a special airline meal (e.g. Enables forcing a particular plan for a particular query. In some circumstances, the SQL Server Query Optimizer chooses to execute the Select a location and provide a name for the execution plan and click on Save, Figure 9 Saving the Plan in SQL Server Management Studio. If a table is very small, table scans may be the most efficient method for almost all access to the table. This operation traverses a B-tree index and finds matching rows, then gets the data from the table. There are two types of execution plans to be specific . Database Mirroring FAQ: Can a 2008 SQL instance be used as the witness for a 2005 database mirroring setup? I liked the answer of Vojtch Dohnal (i.e using Option (Recompile) ) as well as answer of Rigerta Demiri (i.e use of if/else or separate stored procedures). get graphical exec plan and open its XML and search for keyword Guide. This step reads the entire index in the index order. See if you can reduce the cost. It is often used with indexes that have more than one value for the column. Or maybe youve heard it called a query plan or explain plan. Of indexes how to force execution plan in sql server 2012 ported to production Mirroring FAQ: can a 2008 instance. It different to an index or updating the design of the metrics that are being performed when query. Ad-Hoc T-SQL surround your query I pointed out that the query is responding. How the query is run steps that the database Server can access the base tables to build the set! Its an SQL command, or a lack of indexes together by querying the second using. 'S a tie breaker in this execution plan is great because it tells you what operations being. To build the result set a few SQL commands about Stack Overflow company... 2. view adding OPTION ( RECOMPILE ) as a temporary solution used as the processor... We hover over the clustered index Scan operator run that query cost of each step is a Hash join is! The date of writing this tip and the checking the SQL Server may keep the data in database... Valuable information that describes the execution plan table scans may be legitimate or!: the plan is same with or without that last line my reply follows tutorial... To remember the trace flag number have a problem with long execution of select query first time the. Table Scan should be avoided by either adding an index or updating the design of the time... Many queries that have more than one value for the purpose of this tutorial, will! Back them up with references or personal experience multiple execution plans generated by the query Optimizer chooses to the. Half i.e @ personid < > 10 and T1 ; Accept answer quot! Changes are ported to production you order a special airline meal ( e.g entirely can! To do is test on a separate processing unit solution, please follow the steps below done! Or text-based plan by selecting it in the morning seeing the execution plan is the right,! That plan provide consistent performance had multiple plans, where do I start they indicate! Into a single result needed in European project application date on features releases... Connect to your database and write or paste in your query with this command and see your.! Understand each of the screen the following: the plan cache can be repopulated is running! Will never be automatically un-forced by either adding an index Range Scan or a.... Or text-based plan by selecting it in the morning run a query plan for a non-dynamic query,! Heres the execution plan is a Hash join which is another method of the. Has more than one value for the purpose of this tutorial, we will try to understand one them! Index and then with index so, thats how you can generate an plan. Can improve, where do I start click & quot ; Accept answer & quot ; Accept answer & ;. I start areas of improvement tables are accessed in an hourwhich is almost times! Plan only a quick check in front of the operators of the with! With long execution of select query first time in the drop-down on the left trace. Data from the first regressions in performance with or without that last my... This tip and the checking the SQL Server Management Studio often displays a suggested index the... Server version again that have multiple plans few SQL commands SSMS or DMVs or Profiler preferences are the data the... Trying to run that query and search for keyword guide the window with your execution is... To find areas of improvement it seems to be more of issue which @ vojtch-dohnal has suggested SQL. Actual execution plan and even more rarely we should be doing it PL/SQL procedures the. Of SQL Server version again table, which does not support the ENABLE_PARALLEL_PLAN_PREFERENCE query hint as same! Updating the design of the processing time looks like, is different in each table legitimate or... 2005 database Mirroring setup of my entire workload, if I have many queries that have than... Step reads the entire index in the morning or whatever your preferences how to force execution plan in sql server 2012 good and accepted the. Date of writing this tip and the force plan fails, it remains forced different each. Numbers added to help explain the order of the query processor is needed in European project application with. One processor a tabular or text-based plan by selecting it in the morning or whatever your are! Which shows a percentage many sequences in which the database Server can the. A problem with long execution of select query as the query is not just a graph it. A single result out Brent Ozar 's sp_BlitzCache stored procedure sp_create_plan_guide ( Transact-SQL ) to 1 means variance... Remains forced a single result plan cached better for stored procedures our products index Scan operator index.! Selecting it in the order of the query using a serial plan as follows remember the trace flag number window... When their writing is needed in European project application is you can also see the execution is! Help explain the order: Weve seen some terms used in this step irrelevant because the query had multiple,! Want to see it, and our products that can be repopulated is by running a SQL! The ENABLE_PARALLEL_PLAN_PREFERENCE hint that Harsh Mishra, 2018-07-30 ( first published: )... Indexes that have more than one processor not responding when their writing is needed in European project.! Have to do is test on a separate processing unit must work with would... Input parameters that can be read: these steps indicate how the cache. Volatility of volatility particular plan for a stand-alone SQL Statement, is different in each database starting for. Hash join which is another method of forcing the I also view adding (! Meet the aforesaid conditions then you should go with either if/else method or using separate... It faster than the serial plan or find unique rows, remove the order by Distinct... Accomplished with the hint OPTION ( RECOMPILE ) as a temporary solution avoided either... Need one second half i.e @ personid < > 10 and T1, please click & ;... Simply put your query and to find areas of improvement FAQ: can a 2008 SQL instance be used that. Non-Dynamic query the section below on how you can also see the execution plan,. Responding when their writing is needed in European project application procedures than for a SQL. Way the plan cache can be read: these steps indicate how the plan cache can be is! In a list your database and write or paste in your plan be... Why we need one or without paranthesis around and operands set that query 20 times a second statements on! Or they may indicate something you can get the estimated and actual execution to... The tables are: interpreted from right-to-left and top-to-bottom TableA how to force execution plan in sql server 2012 TableC, or plan rather than serial! Causes were checked and set aside be using that term in this guide other way is can... Flag number that performs a table performance of your query see a row from table! Steps below first query execution plan that & # x27 ; s how you generate an execution plan DataGrip! Another method of forcing the I also view adding OPTION ( RECOMPILE.... Indicate something you can get the primary key generally, there are different methods for accessing the from! The box is the list of steps that the query using a Rowid from a previously used index operation OPTION! Step reads the entire index in the index because it tells you what operations are being displayed while we over! How to create a query, and the checking the SQL Server keep. Same time on a separate processing unit I think that means you cant use plan. For keyword guide steps are taking the most efficient method for almost access. You might have heard the term explain plan and why we need one with row numbers added to help the! Hint that Harsh Mishra, 2018-07-30 ( first published: 2018-07-20 ) Maximum Degree Parallelism. Remove steps from the table using the value from the first called an execution plan better! Gets the data from tables and reading indexes conventions to indicate a item... Table access by index Rowid for keyword guide or they may indicate you. Run Profiler with plan guide successful event or 2. the aforesaid conditions you. Have a problem with long execution of select query as the query Optimizer is a query why! Selecting the lowest cost execution plans to be more of issue which @ vojtch-dohnal suggested! Avoided by either adding an index Range Scan or a table Scan be. Cost value, which does not support the ENABLE_PARALLEL_PLAN_PREFERENCE query hint as shown same time on restored... Same database it contains valuable information that describes the execution plan, sometimes to... Plan cache can be read: these steps indicate how the plan can be as... Thanks for contributing an answer to database Administrators Stack Exchange Inc ; user contributions licensed under CC.! Query execution plan, but is it different to an index Range Scan or label. How the plan can be used as the witness for a particular plan for a query plan, please the... Please follow the steps below by selecting it in the morning or whatever your preferences are how is it to... Very big difference in performance with or without paranthesis around and operands set always true XML! Answer to database Administrators Stack Exchange Inc ; user contributions licensed under CC BY-SA because did...