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POcount on LINQ union
 

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    <p>I'm having this link statement:</p> <pre><code>List&lt;UserGroup&gt; domains = UserRepository.Instance.UserIsAdminOf(currentUser.User_ID); query = (from doc in _db.Repository&lt;Document&gt;() join uug in _db.Repository&lt;User_UserGroup&gt;() on doc.DocumentFrom equals uug.User_ID where domains.Contains(uug.UserGroup) select doc) .Union(from doc in _db.Repository&lt;Document&gt;() join uug in _db.Repository&lt;User_UserGroup&gt;() on doc.DocumentTo equals uug.User_ID where domains.Contains(uug.UserGroup) select doc); </code></pre> <p>Running this statement doesn't cause any problems. But when I want to count the resultset the query suddenly runs quite slow.</p> <pre><code>totalRecords = query.Count(); </code></pre> <p>The result of this query is :</p> <pre><code>SELECT COUNT([t5].[DocumentID]) FROM ( SELECT [t4].[DocumentID], [t4].[DocumentFrom], [t4].[DocumentTo] FROM ( SELECT [t0].[DocumentID], [t0].[DocumentFrom], [t0].[DocumentTo FROM [dbo].[Document] AS [t0] INNER JOIN [dbo].[User_UserGroup] AS [t1] ON [t0].[DocumentFrom] = [t1].[User_ID] WHERE ([t1].[UserGroupID] = 2) OR ([t1].[UserGroupID] = 3) OR ([t1].[UserGroupID] = 6) UNION SELECT [t2].[DocumentID], [t2].[DocumentFrom], [t2].[DocumentTo] FROM [dbo].[Document] AS [t2] INNER JOIN [dbo].[User_UserGroup] AS [t3] ON [t2].[DocumentTo] = [t3].[User_ID] WHERE ([t3].[UserGroupID] = 2) OR ([t3].[UserGroupID] = 3) OR ([t3].[UserGroupID] = 6) ) AS [t4] ) AS [t5] </code></pre> <p>Can anyone help me to improve the speed of the count query?</p> <p>Thanks in advance!</p>
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    1. USbrechtvhb
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      1. USArne Sostack
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    1. COWhen you say running the first statement doesn't cause problems, just want to make sure you have done something to execute it... i.e. query.ToList() ?
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    2. COSorry for not being that clear. Running query.ToList() runs fast, query.Count() runs slow.
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