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    <p>As some mentioned in the comments to Mortezas answer there is a CreateIndex/DropIndex method if you use migrations.</p> <p>But if you are in "debug"/development mode and is changing the schema all the time and are recreating the database every time you can use the example mentioned in Morteza answer.</p> <p>To make it a little easier, I have written a very simple extension method to make it strongly typed, as inspiration that I want to share with anyone who reads this question and maybe would like this approach aswell. Just change it to fit your needs and way of naming indexes.</p> <pre><code>You use it like this: context.Database.CreateUniqueIndex&lt;User&gt;(x =&gt; x.Name); </code></pre> <p>.</p> <pre><code> public static void CreateUniqueIndex&lt;TModel&gt;(this Database database, Expression&lt;Func&lt;TModel, object&gt;&gt; expression) { if (database == null) throw new ArgumentNullException("database"); // Assumes singular table name matching the name of the Model type var tableName = typeof(TModel).Name; var columnName = GetLambdaExpressionName(expression.Body); var indexName = string.Format("IX_{0}_{1}", tableName, columnName); var createIndexSql = string.Format("CREATE UNIQUE INDEX {0} ON {1} ({2})", indexName, tableName, columnName); database.ExecuteSqlCommand(createIndexSql); } public static string GetLambdaExpressionName(Expression expression) { MemberExpression memberExp = expression as MemberExpression; if (memberExp == null) { // Check if it is an UnaryExpression and unwrap it var unaryExp = expression as UnaryExpression; if (unaryExp != null) memberExp = unaryExp.Operand as MemberExpression; } if (memberExp == null) throw new ArgumentException("Cannot get name from expression", "expression"); return memberExp.Member.Name; } </code></pre> <hr> <p>Update: From version 6.1 and onwards there is an [Index] attribute available.</p> <p>For more info, see <a href="http://msdn.microsoft.com/en-US/data/jj591583#Index" rel="nofollow">http://msdn.microsoft.com/en-US/data/jj591583#Index</a></p>
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    1. POAdd index with entity framework code first (CTP5)
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    1. CONice, although you can't create multicolumn indexes.
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    2. COWhere to add this index? I tried it in the seed method, but I get the error: Cannot find the object "<NAME>" because it does not exist or you do not have permissions
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