A curious case of SQL Server function

This time, we will talk about ecfVersion_ListFiltered, again.

This stored procedure was previously the subject of several blog posts regarding SQL Server performance optimizations. When I thought it is perfect (in term of performance), I learned something more.

Recently we received a performance report from a customer asking about an issue after upgrading from Commerce 10.4.2 to Commerce 10.8 (the last version before Commerce 11). The job “Publish Delayed Content Versions” starts to throw timeout exceptions.

This scheduled job calls to a ecfVersion_ListFiltered to load the content versions which are in status DelayedPublish, it looks like this when it reaches SQL Server:

This query is known to be slow. The reason is quite obvious – Status contains only 5 or 6 distinct values, so it’s not indexed. SQL Server will have to do a Clustered Index Scan, and if ecfVersion is big enough, it’s inevitably slow.

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Loading carts in a load balancing environment

UPDATE 1: Apparently¬†HttpContext.Current.Request.AnonymousID¬†already uses the cookie internally, so there might be something that makes it stop working. I’ll update when I found out.

Today we received a support ticket as customers seeing corrupted carts data being lost – line items with invalid data, duplicated line items etc. “Corrupted data” is one of the alarming words that we take very seriously, so I decided to jump on it right away.

The setup is a load balancing environment, and the problem only happens with anonymous users. However, it can be “fixed” by turning on the sticky sessions mode. So basically, instead of having sessions on the memory of a server (so sessions on server A can’t be seen by server B, and vice versa), they need a mechanism (can be a database) to share sessions between servers.

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Announcing a new book: Episerver Commerce: A problem – solution approach

More than one year ago, I announced that I was working on a book – a first Episerver Commerce book ever. It has been a work in progress until recently – and I am still adding updates here and there. The book has received quite positive feedback (I’m happy to say that everyone is nice enough to not tell me “Your book sucks”. Thanks, everyone). Am I happy with it? Yes, of course, proud even.

But to be completely honest,

I know something was missing.

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