Sql option recompile

Can someone give me an example?

Today is the last blog post of the year and this is also a final blog post in the series of Parameter Sniffing which I have been writing. I strongly recommend that you read my earlier blog posts on this topic before you consider the option of recompile suggested in this blog post. Before continuing this blog post, I strongly suggest that you read the following blog posts to get an understanding of the background of the concept which I am going to discuss today. Here is what we have learned so far. It is extremely easy to overcome the problem of parameter sniffing. However, it is extremely difficult to overcome the performance problem which is introduced due to the parameter sniffing issue.

Sql option recompile

Here are some problems you can hit with recompile. Not necessarily caused by recompile, but by not re-using plans. Those are very real problems that I see on client systems pretty frequently. But all that assumes that those options are immediately available. You can always yoink it out later. Or whatever. As for recompiles, I agree. Once I did my tweaks to the rather short code in the proc, not only did the recompiles go away but the execution is now measured in single digit ms. Thank goodness for TF Thanks, Jeff. Always appreciate your comments.

Nupur Dave is a social media enthusiast and an independent consultant.

Not sure what parameter sniffing is? Learn from this blog post or this 50 minute free video. You must decide: what hint or command do you use, and where do you put it? What trade-offs are you making when it comes to being able to performance tune your SQL Server in the future? This post runs through common options you have to nudge or whack SQL Server into generating a fresh execution plan. Disclaimer : Recompile hints can kill your performance by lighting your CPUs on fire when used incorrectly.

Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Query hints specify that the indicated hints are used in the scope of a query. They affect all operators in the statement. Error occurs if one or more query hints cause the Query Optimizer not to generate a valid plan. Because the SQL Server Query Optimizer typically selects the best execution plan for a query, we recommend only using hints as a last resort for experienced developers and database administrators. Transact-SQL syntax conventions. If you specify more than one join hint, the optimizer selects the least expensive join strategy from the allowed ones.

Sql option recompile

Today, I want to address a few of the comments as well as continue with a few tips and tricks using these commands. And, once again, we see the optimal plan to use the index and do a bookmark lookup because this query is highly selective only 1 row. In fact, we can see that from checking our plan cache as well:. Even though this is the third time we have executed this statement, this final execution was NOT put in cache. And, it will NOT affect future executions. Now, the other two questions — these are a lot more interesting and this is where I think that stored procedures should be used. Personally, I think that developers that know the data and know the application — will be a lot better at creating the RIGHT code especially when they understand all of the options available to them. However, this is also where things get more challenging.

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However, it is extremely difficult to overcome the performance problem which is introduced due to the parameter sniffing issue. Log in or register to rate. Maintainability: Using stored procedures simplifies code maintenance. Please advice the usage as per the following reference. However, since we are sql guys… dealing with sets… death to RBAR …. If the answer is the right solution, please click "Accept Answer" and kindly upvote it. Today is the last blog post of the year and this is also a final blog post in the series of Parameter Sniffing which I have been writing. At that point, existing execution statistics in sys. I also tried the case of table variable and it works as per above SO post. At the same time, the GetProductionList procedure query plan is not inserted into the query plan cache. This time around I'd like to talk about social networking. Want to advertise here and reach my savvy readers? The simplest thing in terms of showing managers is just to run it in a tight loop with the hint and show the CPU chart, and then run it without and show the CPU chart. When we enable the Actual Execution Plan and then look at the select operator properties.

Today is the last blog post of the year and this is also a final blog post in the series of Parameter Sniffing which I have been writing.

There are bullet points where I talk about that. I hate to use the hint because normally they execute very well. Ivan Arzhentinski. Long-compiling queries? Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread. Provide product feedback. But this is not the case in our sql server. If these values represent the typical ones with which the procedure is subsequently called, then the procedure benefits from the query plan every time that it compiles and executes. Want to advertise here and reach my savvy readers? Nic Neufeld.