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If you notice number of rows read between express and web edition, you are reading 435 rows in express whereas 390 in the standard edition(PK_Client) and there is difference in number of select statement also as per your screenshot of "Client Statistics". I am of opinion that there is slight difference in the number of logical reads between two plans. They can both go 20 mph but they can't both go 120 mph. Think of it like comparing the speed between a crappy car and a standard car. If you're going to run tiny queries, then you don't need to worry about it but if you run bigger ones, you are going to run into paging issues. I'd double check all the instance properties and the database properties but if you went standard you could go much faster potentially than express. The main difference in performance between the two versions comes in the ability for standard to allocate more resources towards SQL server. Have you tried this: -turn on statistics.
MS SQL SERVER 2016 EXPRESS VS STANDARD PERFORMANCE SOFTWARE
If you have the same data, on the same machine, on the same network, and you're getting the same execution plan, it seems like it'd be a configuration setting in the software itself. Most of the time I see ASYNC_NETWORK_IO happening it is due to the application not processing the rows fast enough (application design / app server under heavy load / stress).Īfter validating the application, the network would be the next suspect. Second is that there may be a network performance issue. Waiting for the client application to process the result set and sendĪ signal back to SQL Server that it is ready to process more data. The first scenario is that the session (i.e., SPID) is The ASYNC_NETWORK_IO wait indicates that one of two scenarios are Some parts of a previous answer on why ASYNC_NETWORK_IO occurs by Tom V
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These details in the actual execution plan mean that the issue is not directly related to the performance of the instance itself, but to the processing of these rows. In the execution plan of the query that performs worse we find the following wait stats: įor the 295ms that the query executed, 280ms was waiting on ASYNC_NETWORK_IO.Īs a result, 14ms cpu time & 15ms elapsed time without these wait stats seem reasonable to me. Is there a minimum DB size for non-Express Edition? (this would not make sense.) Over multiple tries Express is 50% faster on this very simple query.
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Here are the timings as measured by SSMS (latest): These are the plans for Express and Web Edition. I was told to give example: select top (500) * Multiple people have looked at it and we cannot figure out why. SQL Server settings appear to be the same. It is not specific to Web Edition and the type of server as this was replicated on development machines on Express VS Developer Edition.
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This is a repeatable problem not just once off. Queries are multiple in forms and complexities all run about half the speed in Web Edition. Files are small and in the standard locations. I compared settings in SSMS looking at server properties. I used a backup of Express and loaded it on a Web Edition server. It does not matter if the web application is run locally in the same machine or remotely accessing SQL sever though network, same problem. I even tried have both Express and Web Editions on the same machine with only one instance enabled at a time, same problem. Machines are good enough for the job: 8G 4 cores and DBs are small in size less than 1GB of data. Some are on SQL Server 2012, others on 2017 - same problem. What could explain SQL Server Express Edition being much faster than Web / Standard Edition?