Suspended process with ASYNC_NETWORK_IO wait type
Posted on 2008-10-13
I am using and Access front end to connect to a SQL Serve 2005 database using linked odbc tables. This database was upscaled some months ago from a multi-user Access 2003 database. I have noticed many suspended processes with ASYNC_NETWORK_IO wait type in SQL activity monitor.
The SQL statement of one of these processes is:
SELECT "CustomerID" ,"CompanyName" FROM "dbo"."Customers" ORDER BY "dbo"."Customers"."CustomerID"
The CustomerID column contains a numeric index, and CompanyName a text string, with about 12,000 records in the table. The server has a gigabit nic.
I was looking in the direction of a network bottleneck due to the wait type until I did observed the following: The process gets suspended almost immediately after opening the access front end on a single client machine; Executing the T-sql command locally on the server executes almost immediately.
Can someone confirm what causes result in suspended processes with this wait type? When does the decision get made to suspend the process? Where should I go from here?