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diff --git a/OpenSim/Region/Framework/Scenes/Tests/SceneObjectLinkingTests.cs b/OpenSim/Region/Framework/Scenes/Tests/SceneObjectLinkingTests.cs
new file mode 100644
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--- /dev/null
+++ b/OpenSim/Region/Framework/Scenes/Tests/SceneObjectLinkingTests.cs
@@ -0,0 +1,372 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using NUnit.Framework;
+using OpenMetaverse;
+using OpenSim.Framework;
+using OpenSim.Framework.Communications;
+using OpenSim.Region.Framework.Scenes;
+using OpenSim.Tests.Common;
+using log4net;
+
+namespace OpenSim.Region.Framework.Scenes.Tests
+{
+    [TestFixture]
+    public class SceneObjectLinkingTests : OpenSimTestCase
+    {
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
+        /// <summary>
+        /// Links to self should be ignored.
+        /// </summary>
+        [Test]
+        public void TestLinkToSelf()
+        {
+            TestHelpers.InMethod();
+
+            UUID ownerId = TestHelpers.ParseTail(0x1);
+            int nParts = 3;
+
+            TestScene scene = new SceneHelpers().SetupScene();
+            SceneObjectGroup sog1 = SceneHelpers.CreateSceneObject(nParts, ownerId, "TestLinkToSelf_", 0x10);
+            scene.AddSceneObject(sog1);
+            scene.LinkObjects(ownerId, sog1.LocalId, new List<uint>() { sog1.Parts[1].LocalId });
+//            sog1.LinkToGroup(sog1);
+
+            Assert.That(sog1.Parts.Length, Is.EqualTo(nParts));
+        }
+
+        [Test]
+        public void TestLinkDelink2SceneObjects()
+        {
+            TestHelpers.InMethod();
+            
+            bool debugtest = false; 
+
+            Scene scene = new SceneHelpers().SetupScene();
+            SceneObjectGroup grp1 = SceneHelpers.AddSceneObject(scene);
+            SceneObjectPart part1 = grp1.RootPart;
+            SceneObjectGroup grp2 = SceneHelpers.AddSceneObject(scene);
+            SceneObjectPart part2 = grp2.RootPart;
+
+            grp1.AbsolutePosition = new Vector3(10, 10, 10);
+            grp2.AbsolutePosition = Vector3.Zero;
+
+            // <90,0,0>
+//            grp1.UpdateGroupRotationR(Quaternion.CreateFromEulers(90 * Utils.DEG_TO_RAD, 0, 0));
+
+            // <180,0,0>
+            grp2.UpdateGroupRotationR(Quaternion.CreateFromEulers(180 * Utils.DEG_TO_RAD, 0, 0));
+            
+            // Required for linking
+            grp1.RootPart.ClearUpdateSchedule();
+            grp2.RootPart.ClearUpdateSchedule();
+
+            // Link grp2 to grp1.   part2 becomes child prim to grp1. grp2 is eliminated.
+            Assert.IsFalse(grp1.GroupContainsForeignPrims);
+            grp1.LinkToGroup(grp2);
+            Assert.IsTrue(grp1.GroupContainsForeignPrims);
+
+            scene.Backup(true);
+            Assert.IsFalse(grp1.GroupContainsForeignPrims);
+
+            // FIXME: Can't do this test yet since group 2 still has its root part!  We can't yet null this since
+            // it might cause SOG.ProcessBackup() to fail due to the race condition.  This really needs to be fixed.
+            Assert.That(grp2.IsDeleted, "SOG 2 was not registered as deleted after link.");
+            Assert.That(grp2.Parts.Length, Is.EqualTo(0), "Group 2 still contained children after delink.");
+            Assert.That(grp1.Parts.Length == 2);
+
+            if (debugtest)
+            {
+                m_log.Debug("parts: " + grp1.Parts.Length);
+                m_log.Debug("Group1: Pos:"+grp1.AbsolutePosition+", Rot:"+grp1.GroupRotation);
+                m_log.Debug("Group1: Prim1: OffsetPosition:"+ part1.OffsetPosition+", OffsetRotation:"+part1.RotationOffset);
+                m_log.Debug("Group1: Prim2: OffsetPosition:"+part2.OffsetPosition+", OffsetRotation:"+part2.RotationOffset);
+            }
+
+            // root part should have no offset position or rotation
+            Assert.That(part1.OffsetPosition == Vector3.Zero && part1.RotationOffset == Quaternion.Identity, 
+                "root part should have no offset position or rotation");
+
+            // offset position should be root part position - part2.absolute position.
+            Assert.That(part2.OffsetPosition == new Vector3(-10, -10, -10),
+                "offset position should be root part position - part2.absolute position.");
+
+            float roll = 0;
+            float pitch = 0;
+            float yaw = 0;
+
+            // There's a euler anomoly at 180, 0, 0 so expect 180 to turn into -180.
+            part1.RotationOffset.GetEulerAngles(out roll, out pitch, out yaw);
+            Vector3 rotEuler1 = new Vector3(roll * Utils.RAD_TO_DEG, pitch * Utils.RAD_TO_DEG, yaw * Utils.RAD_TO_DEG);
+            
+            if (debugtest)
+                m_log.Debug(rotEuler1);
+
+            part2.RotationOffset.GetEulerAngles(out roll, out pitch, out yaw);
+            Vector3 rotEuler2 = new Vector3(roll * Utils.RAD_TO_DEG, pitch * Utils.RAD_TO_DEG, yaw * Utils.RAD_TO_DEG);
+             
+            if (debugtest)
+                m_log.Debug(rotEuler2);
+
+            Assert.That(rotEuler2.ApproxEquals(new Vector3(-180, 0, 0), 0.001f) || rotEuler2.ApproxEquals(new Vector3(180, 0, 0), 0.001f),
+                "Not exactly sure what this is asserting...");
+
+            // Delink part 2
+            SceneObjectGroup grp3 = grp1.DelinkFromGroup(part2.LocalId);
+
+            if (debugtest)
+                m_log.Debug("Group2: Prim2: OffsetPosition:" + part2.AbsolutePosition + ", OffsetRotation:" + part2.RotationOffset);
+
+            Assert.That(grp1.Parts.Length, Is.EqualTo(1), "Group 1 still contained part2 after delink.");
+            Assert.That(part2.AbsolutePosition == Vector3.Zero, "The absolute position should be zero");
+            Assert.NotNull(grp3);
+        }
+
+        [Test]
+        public void TestLinkDelink2groups4SceneObjects()
+        {
+            TestHelpers.InMethod();
+            
+            bool debugtest = false;
+
+            Scene scene = new SceneHelpers().SetupScene();
+            SceneObjectGroup grp1 = SceneHelpers.AddSceneObject(scene);
+            SceneObjectPart part1 = grp1.RootPart;
+            SceneObjectGroup grp2 = SceneHelpers.AddSceneObject(scene);
+            SceneObjectPart part2 = grp2.RootPart;
+            SceneObjectGroup grp3 = SceneHelpers.AddSceneObject(scene);
+            SceneObjectPart part3 = grp3.RootPart;
+            SceneObjectGroup grp4 = SceneHelpers.AddSceneObject(scene);
+            SceneObjectPart part4 = grp4.RootPart;
+
+            grp1.AbsolutePosition = new Vector3(10, 10, 10);
+            grp2.AbsolutePosition = Vector3.Zero;
+            grp3.AbsolutePosition = new Vector3(20, 20, 20);
+            grp4.AbsolutePosition = new Vector3(40, 40, 40);
+
+            // <90,0,0>
+//            grp1.UpdateGroupRotationR(Quaternion.CreateFromEulers(90 * Utils.DEG_TO_RAD, 0, 0));
+
+            // <180,0,0>
+            grp2.UpdateGroupRotationR(Quaternion.CreateFromEulers(180 * Utils.DEG_TO_RAD, 0, 0));
+
+            // <270,0,0>
+//            grp3.UpdateGroupRotationR(Quaternion.CreateFromEulers(270 * Utils.DEG_TO_RAD, 0, 0));
+
+            // <0,90,0>
+            grp4.UpdateGroupRotationR(Quaternion.CreateFromEulers(0, 90 * Utils.DEG_TO_RAD, 0));
+
+            // Required for linking
+            grp1.RootPart.ClearUpdateSchedule();
+            grp2.RootPart.ClearUpdateSchedule();
+            grp3.RootPart.ClearUpdateSchedule();
+            grp4.RootPart.ClearUpdateSchedule();
+
+            // Link grp2 to grp1.   part2 becomes child prim to grp1. grp2 is eliminated.
+            grp1.LinkToGroup(grp2);
+
+            // Link grp4 to grp3.
+            grp3.LinkToGroup(grp4);
+            
+            // At this point we should have 4 parts total in two groups.
+            Assert.That(grp1.Parts.Length == 2, "Group1 children count should be 2");
+            Assert.That(grp2.IsDeleted, "Group 2 was not registered as deleted after link.");
+            Assert.That(grp2.Parts.Length, Is.EqualTo(0), "Group 2 still contained parts after delink.");
+            Assert.That(grp3.Parts.Length == 2, "Group3 children count should be 2");
+            Assert.That(grp4.IsDeleted, "Group 4 was not registered as deleted after link.");
+            Assert.That(grp4.Parts.Length, Is.EqualTo(0), "Group 4 still contained parts after delink.");
+            
+            if (debugtest)
+            {
+                m_log.Debug("--------After Link-------");
+                m_log.Debug("Group1: parts:" + grp1.Parts.Length);
+                m_log.Debug("Group1: Pos:"+grp1.AbsolutePosition+", Rot:"+grp1.GroupRotation);
+                m_log.Debug("Group1: Prim1: OffsetPosition:" + part1.OffsetPosition + ", OffsetRotation:" + part1.RotationOffset);
+                m_log.Debug("Group1: Prim2: OffsetPosition:"+part2.OffsetPosition+", OffsetRotation:"+ part2.RotationOffset);
+
+                m_log.Debug("Group3: parts:" + grp3.Parts.Length);
+                m_log.Debug("Group3: Pos:"+grp3.AbsolutePosition+", Rot:"+grp3.GroupRotation);
+                m_log.Debug("Group3: Prim1: OffsetPosition:"+part3.OffsetPosition+", OffsetRotation:"+part3.RotationOffset);
+                m_log.Debug("Group3: Prim2: OffsetPosition:"+part4.OffsetPosition+", OffsetRotation:"+part4.RotationOffset);
+            }
+
+            // Required for linking
+            grp1.RootPart.ClearUpdateSchedule();
+            grp3.RootPart.ClearUpdateSchedule();
+
+            // root part should have no offset position or rotation
+            Assert.That(part1.OffsetPosition == Vector3.Zero && part1.RotationOffset == Quaternion.Identity,
+                "root part should have no offset position or rotation (again)");
+
+            // offset position should be root part position - part2.absolute position.
+            Assert.That(part2.OffsetPosition == new Vector3(-10, -10, -10),
+                "offset position should be root part position - part2.absolute position (again)");
+
+            float roll = 0;
+            float pitch = 0;
+            float yaw = 0;
+
+            // There's a euler anomoly at 180, 0, 0 so expect 180 to turn into -180.
+            part1.RotationOffset.GetEulerAngles(out roll, out pitch, out yaw);
+            Vector3 rotEuler1 = new Vector3(roll * Utils.RAD_TO_DEG, pitch * Utils.RAD_TO_DEG, yaw * Utils.RAD_TO_DEG);
+
+            if (debugtest)
+                m_log.Debug(rotEuler1);
+
+            part2.RotationOffset.GetEulerAngles(out roll, out pitch, out yaw);
+            Vector3 rotEuler2 = new Vector3(roll * Utils.RAD_TO_DEG, pitch * Utils.RAD_TO_DEG, yaw * Utils.RAD_TO_DEG);
+
+            if (debugtest)
+                m_log.Debug(rotEuler2);
+
+            Assert.That(rotEuler2.ApproxEquals(new Vector3(-180, 0, 0), 0.001f) || rotEuler2.ApproxEquals(new Vector3(180, 0, 0), 0.001f),
+                "Not sure what this assertion is all about...");
+
+            // Now we're linking the first group to the third group.  This will make the first group child parts of the third one.
+            grp3.LinkToGroup(grp1);
+
+            // Delink parts 2 and 3
+            grp3.DelinkFromGroup(part2.LocalId);
+            grp3.DelinkFromGroup(part3.LocalId);
+
+            if (debugtest)
+            {
+                m_log.Debug("--------After De-Link-------");
+                m_log.Debug("Group1: parts:" + grp1.Parts.Length);
+                m_log.Debug("Group1: Pos:" + grp1.AbsolutePosition + ", Rot:" + grp1.GroupRotation);
+                m_log.Debug("Group1: Prim1: OffsetPosition:" + part1.OffsetPosition + ", OffsetRotation:" + part1.RotationOffset);
+                m_log.Debug("Group1: Prim2: OffsetPosition:" + part2.OffsetPosition + ", OffsetRotation:" + part2.RotationOffset);
+
+                m_log.Debug("Group3: parts:" + grp3.Parts.Length);
+                m_log.Debug("Group3: Pos:" + grp3.AbsolutePosition + ", Rot:" + grp3.GroupRotation);
+                m_log.Debug("Group3: Prim1: OffsetPosition:" + part3.OffsetPosition + ", OffsetRotation:" + part3.RotationOffset);
+                m_log.Debug("Group3: Prim2: OffsetPosition:" + part4.OffsetPosition + ", OffsetRotation:" + part4.RotationOffset);
+            }
+
+            Assert.That(part2.AbsolutePosition == Vector3.Zero, "Badness 1");
+            Assert.That(part4.OffsetPosition == new Vector3(20, 20, 20), "Badness 2");
+            Quaternion compareQuaternion = new Quaternion(0, 0.7071068f, 0, 0.7071068f);
+            Assert.That((part4.RotationOffset.X - compareQuaternion.X < 0.00003) 
+                && (part4.RotationOffset.Y - compareQuaternion.Y < 0.00003) 
+                && (part4.RotationOffset.Z - compareQuaternion.Z < 0.00003) 
+                && (part4.RotationOffset.W - compareQuaternion.W < 0.00003),
+                "Badness 3");
+        }
+        
+        /// <summary>
+        /// Test that a new scene object which is already linked is correctly persisted to the persistence layer.
+        /// </summary>
+        [Test]
+        public void TestNewSceneObjectLinkPersistence()
+        {
+            TestHelpers.InMethod();
+            //log4net.Config.XmlConfigurator.Configure();
+            
+            TestScene scene = new SceneHelpers().SetupScene();
+            
+            string rootPartName = "rootpart";
+            UUID rootPartUuid = new UUID("00000000-0000-0000-0000-000000000001");
+            string linkPartName = "linkpart";
+            UUID linkPartUuid = new UUID("00000000-0000-0000-0001-000000000000");
+
+            SceneObjectPart rootPart
+                = new SceneObjectPart(UUID.Zero, PrimitiveBaseShape.Default, Vector3.Zero, Quaternion.Identity, Vector3.Zero) 
+                    { Name = rootPartName, UUID = rootPartUuid };
+            SceneObjectPart linkPart
+                = new SceneObjectPart(UUID.Zero, PrimitiveBaseShape.Default, Vector3.Zero, Quaternion.Identity, Vector3.Zero) 
+                    { Name = linkPartName, UUID = linkPartUuid };
+
+            SceneObjectGroup sog = new SceneObjectGroup(rootPart);
+            sog.AddPart(linkPart);
+            scene.AddNewSceneObject(sog, true);
+            
+            // In a test, we have to crank the backup handle manually.  Normally this would be done by the timer invoked
+            // scene backup thread.
+            scene.Backup(true);
+            
+            List<SceneObjectGroup> storedObjects = scene.SimulationDataService.LoadObjects(scene.RegionInfo.RegionID);
+            
+            Assert.That(storedObjects.Count, Is.EqualTo(1));
+            Assert.That(storedObjects[0].Parts.Length, Is.EqualTo(2));
+            Assert.That(storedObjects[0].ContainsPart(rootPartUuid));
+            Assert.That(storedObjects[0].ContainsPart(linkPartUuid));
+        }
+        
+        /// <summary>
+        /// Test that a delink of a previously linked object is correctly persisted to the database
+        /// </summary>
+        [Test]
+        public void TestDelinkPersistence()
+        {
+            TestHelpers.InMethod();
+            //log4net.Config.XmlConfigurator.Configure();
+            
+            TestScene scene = new SceneHelpers().SetupScene();
+            
+            string rootPartName = "rootpart";
+            UUID rootPartUuid = new UUID("00000000-0000-0000-0000-000000000001");
+            string linkPartName = "linkpart";
+            UUID linkPartUuid = new UUID("00000000-0000-0000-0001-000000000000");
+
+            SceneObjectPart rootPart
+                = new SceneObjectPart(UUID.Zero, PrimitiveBaseShape.Default, Vector3.Zero, Quaternion.Identity, Vector3.Zero) 
+                    { Name = rootPartName, UUID = rootPartUuid };
+            
+            SceneObjectPart linkPart
+                = new SceneObjectPart(UUID.Zero, PrimitiveBaseShape.Default, Vector3.Zero, Quaternion.Identity, Vector3.Zero) 
+                    { Name = linkPartName, UUID = linkPartUuid };
+            SceneObjectGroup linkGroup = new SceneObjectGroup(linkPart);
+            scene.AddNewSceneObject(linkGroup, true);
+
+            SceneObjectGroup sog = new SceneObjectGroup(rootPart);
+            scene.AddNewSceneObject(sog, true);
+
+            Assert.IsFalse(sog.GroupContainsForeignPrims);
+            sog.LinkToGroup(linkGroup);
+            Assert.IsTrue(sog.GroupContainsForeignPrims);
+
+            scene.Backup(true);
+            Assert.AreEqual(1, scene.SimulationDataService.LoadObjects(scene.RegionInfo.RegionID).Count);
+
+            // These changes should occur immediately without waiting for a backup pass
+            SceneObjectGroup groupToDelete = sog.DelinkFromGroup(linkPart, false);
+            Assert.IsFalse(groupToDelete.GroupContainsForeignPrims);
+
+            scene.DeleteSceneObject(groupToDelete, false);
+            
+            List<SceneObjectGroup> storedObjects = scene.SimulationDataService.LoadObjects(scene.RegionInfo.RegionID);
+
+            Assert.AreEqual(1, storedObjects.Count);
+            Assert.AreEqual(1, storedObjects[0].Parts.Length);
+            Assert.IsTrue(storedObjects[0].ContainsPart(rootPartUuid));
+        }
+    }
+}