Why schemabinding in view

Note 2 : If you want to create index on view then your view must be Schema bound. Take a look at the following example to create a simple UDF:. It helps to improve query execution plan better. Next Recommended Reading. Windows 10 Vs Windows Visual Studio Vs Visual Studio Understanding Matplotlib With Examples. Understanding Numpy With Examples. C Evolution. Everything That Every.

Now you can attempt to run the view and it will give you the following error:. Here are a few additional blog posts related to Views which I had written earlier:. Can schemabinding also influence inserts in the base table?

He holds a Masters of Science degree and numerous database certifications. Pinal is an experienced and dedicated professional with a deep commitment to flawless customer service. Nupur Dave is a social media enthusiast and an independent consultant. That's not good, right?

That's just all kinds of messed up. What is happening is that the view is still referencing the old metadata for the columns, and so is returning data based on column ordinal, not column name. Okay, I said non-performance-related benefits, but there may be cases where Halloween protection is in place, causing a more expensive DML plan, but it is not obvious to the person trying to troubleshoot performance.

So it is important to be able to identify that this might be the cause - as Paul White explained at the end of his last post on the Halloween problem , this protection "will not always show up as an extra Eager Table Spool, and scalar function calls may be hidden in views or computed column definitions, for example. Some will say that having to touch additional modules to make changes to a single object might be a downside, but I don't see it that way at all.

In fact I think it is essential to be forced to take all of these dependent objects into account before making a schema change of any kind. And in some cases, you will just happen to enjoy performance benefits as well. I agree whole heartedly about schemabinding. There is one place where it can have consequences that I haven't been able to get around. This site uses Akismet to reduce spam.

Learn how your comment data is processed. RSS - Posts. RSS - Comments. Email Address:. That still sounds a bit confusing. This may be easier with an example I like examples. Id, Table2. Col1, Table2. Table3 ON Table2. When creating a schemabound view or function you have to use the two part name include the schema name for any tables or views you reference within it. Col2 is not referenced by any schemabound objects. You cannot change the collation of a database with schemabound objects.

You do get a rather unhelpful error though. You can make any change to the table that do not affect the structure of the bound columns.

If you reference a view or function in a schemabound view or function then that view or function must also be schemabound. Like this: Like Loading August 11, at AM. Diana says:. Kenneth Fisher says:. SQL Studies says:. September 15, at AM.