I have some queries that are parameterized, but they are still creating a new execution plan each time. I am using SQL Server 2016.

Queries are like:

(@P1 varchar(1043),@P2 varchar(6))
UPDATE table 

This query is not using the already generated execution plan from the cache, rather it is creating a new plan each time.

This image shows the plancount an individual query is creating and the queries

The length of @P1 is different in all of those.

You're getting different plans because you're not explicitly setting parameter lengths in your code.

Any difference in strings, no matter how minor, will generate a new plan. Data type sizes, spaces, comments, all of them will cause new entries in the plan cache. Here's a demo video illustrating the problem.

  • @HardikTalwar link updated, but the video doesn't show you how to set lengths in your app code, it just shows you how different things affect plan caching, etc. – sp_BlitzErik Aug 30 at 17:24
  • I followed the video and did the same show in that video thereby running that stored procedure I am getting some queries which are exactly same there is no difference of gaps or anything they are same but still executing different times – Hardik Talwar Aug 30 at 17:54
  • @HardikTalwar I'm not sure if that's a different question than your original one or not. If it's a different question, feel free to ask it on the main site. If it's another point about your original question, please update it with the relevant information. – sp_BlitzErik Aug 30 at 17:56

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