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src/Umbraco.Core/Persistence/Migrations/Upgrades/TargetVersionSevenSixZero/AddIndexToCmsMemberLoginName.cs

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+using System.Linq;
+using Umbraco.Core.Logging;
+using Umbraco.Core.Persistence.DatabaseModelDefinitions;
+using Umbraco.Core.Persistence.SqlSyntax;
+
+namespace Umbraco.Core.Persistence.Migrations.Upgrades.TargetVersionSevenSixZero
+{
+    [Migration("7.6.0", 0, Constants.System.UmbracoMigrationName)]
+    public class AddIndexToCmsMemberLoginName : MigrationBase
+    {
+        public AddIndexToCmsMemberLoginName(ISqlSyntaxProvider sqlSyntax, ILogger logger)
+            : base(sqlSyntax, logger)
+        { }
+
+        public override void Up()
+        {
+            var dbIndexes = SqlSyntax.GetDefinedIndexes(Context.Database)
+                .Select(x => new DbIndexDefinition()
+                {
+                    TableName = x.Item1,
+                    IndexName = x.Item2,
+                    ColumnName = x.Item3,
+                    IsUnique = x.Item4
+                }).ToArray();
+
+            //make sure it doesn't already exist
+            if (dbIndexes.Any(x => x.IndexName.InvariantEquals("IX_cmsMember_LoginName")) == false)
+            {
+                Create.Index("IX_cmsMember_LoginName").OnTable("cmsMember")
+                    .OnColumn("LoginName")
+                    .Ascending()
+                    .WithOptions()
+                    .NonClustered();
+            }
+        }
+
+        public override void Down()
+        {
+            Delete.Index("IX_cmsMember_LoginName").OnTable("cmsMember");
+        }
+    }
+}