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    <p>Fully qualified names are usually preferred, but some considerations apply. I will say it depends a lot on the requirements and a single answer may not suffice all scenarios.</p> <p>Note that this is just a compilation binding, not an execution one. So if you execute the same query thousand times, only the first execution will 'hit' the look up time, which means lookup time is less in case of fully qualified names. This also means using fully qualified names will save the compilation overhead (the first time when query is executed).</p> <p>The rest will reuse the compiled one, where names are resolved to object references.</p> <p>This <a href="http://msdn.microsoft.com/en-us/library/dd283095%28v=sql.100%29.aspx" rel="noreferrer">MSDN Article</a> gives a fair guidance on SQL Server best practices. (Check the section named: <strong>How to Refer to Objects</strong>)</p> <p>This link explains in more details on set of steps done to resolve and validate the object references before execution: <a href="http://blogs.msdn.com/b/mssqlisv/archive/2007/03/23/upgrading-to-sql-server-2005-and-default-schema-setting.aspx" rel="noreferrer">http://blogs.msdn.com/b/mssqlisv/archive/2007/03/23/upgrading-to-sql-server-2005-and-default-schema-setting.aspx</a></p> <p>Going through the second link, the conclusion says that:</p> <blockquote> <p>Obviously the best practice still stands: You should fully qualify all object names and not worry about the name resolution cost at all. The reality is, there are still many imperfect applications out there and this setting help great for those cases.</p> </blockquote> <p><strong>Also, in case the database name change is not allowed on production environment, you may then think to include database names in fully qualified names.</strong></p>
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    1. PODoes using fully qualified names affect performance?
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    1. COThat is talking about schema qualifying (two part names) not three part names. I would definitely avoid three part names inside DB objects (procedures etc) as it means if the DB is ever renamed or restored under a new name they will need to be changed.
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    2. CO@Martin: The MSDN article says: To reference an object located in a remote database, the fully qualified object name includes the server name and the database name. This is why MSDN article was referred to take more Ideas. Even the conclusion part of MSDN confirms the same : Always refer to the objects using a fully qualified name. At the very least, use the schema name followed by the object name. And yes, Database names can change. However Its more of Unlikely to happen in Production scenarios. Even in Testing scenarios ( UAT ) it happens rarely.
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    3. COMsdn Also says: The assessment process can be improved by using either the fully qualified name or the DEFAULT_SCHEMA option. I will say It depends a lot on the requirements and a single answer may not suffice all scenarios. Database name changes are possible but so far I beleive it is against the standard practice followed by many organizations. Since we usually have database names in connection strings stored in web.config ,for example. This will definitely affect all the applications deployed to Production environment.
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