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diff --git a/tests/org.simantics.db.tests/src/org/simantics/db/tests/scalability/LargeCommitTest.java b/tests/org.simantics.db.tests/src/org/simantics/db/tests/scalability/LargeCommitTest.java
new file mode 100644
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--- /dev/null
+++ b/tests/org.simantics.db.tests/src/org/simantics/db/tests/scalability/LargeCommitTest.java
@@ -0,0 +1,117 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.tests.scalability;
+
+import java.util.Collection;
+import java.util.UUID;
+
+import org.junit.Test;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.Session;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.testing.base.ExistingDatabaseTest;
+import org.simantics.db.testing.common.WriteQuery;
+import org.simantics.layer0.Layer0;
+
+public class LargeCommitTest extends ExistingDatabaseTest {
+    
+    private static final int OUTER_INSTANCE_COUNT = 10; // these go to the root library
+    private static final int INNER_INSTANCE_COUNT = 100; // these are for each outer instance
+
+    /**
+     * Creates new type and new instance of it. Then tries to find the instance and the type, and verifies that inheritance is correct. 
+     * @throws Exception
+     */
+    @Test
+    public void testCommit() throws Exception{
+        Session session = getSession();
+        final Resource rootLib = getSession().getRootLibrary();
+        final String random = UUID.randomUUID().toString();
+        final String newTypeName = "New Type" + random; 
+        session.syncRequest(new WriteQuery(this) {
+			@Override
+			public void run(WriteGraph g) throws Throwable {
+                Layer0 b = Layer0.getInstance(g);
+				Resource newType = g.newResource();
+                g.claim(newType, b.InstanceOf, null, b.Type);
+                g.claim(newType, b.Inherits, b.SupertypeOf, b.Type);
+                g.claimLiteral(newType, b.HasName, newTypeName);
+                g.claim(rootLib, b.ConsistsOf, newType);
+                
+                for (int i=0; i<OUTER_INSTANCE_COUNT; ++i) {
+                    //System.out.println("Write outer=" + i);
+                    Resource outerInstance = g.newResource();
+                    g.claim(outerInstance, b.InstanceOf, null, newType);
+                    String outerInstanceName = random+(i+1);
+                    g.claimLiteral(outerInstance, b.HasName, outerInstanceName);
+                    g.claim(rootLib, b.ConsistsOf, outerInstance);
+                    for (int j=0; j<INNER_INSTANCE_COUNT; ++j) {
+                        Resource innerInstance = g.newResource();
+                        g.claim(innerInstance, b.InstanceOf, null, newType);
+                        String innerInstanceName = ""+(j+1);
+                        g.claimLiteral(innerInstance, b.HasName, innerInstanceName);
+                        g.claim(outerInstance, b.ConsistsOf, innerInstance);
+                    }
+                }
+            }
+        });
+        
+        checkException();
+        
+        session.syncRequest(new TestReadRequest() {
+            @Override
+            public void run(ReadGraph g) throws Exception  {
+                Layer0 b = Layer0.getInstance(g);
+                Collection<Resource> resources = g.getObjects(rootLib, b.ConsistsOf);
+                Resource newType = null;
+                Resource newInstance[] = new Resource[OUTER_INSTANCE_COUNT];
+                for (Resource r : resources) {
+                    String name = g.getPossibleRelatedValue(r, b.HasName);
+                    if (null == name)
+                    	continue;
+                    if (name.equals(newTypeName)) {
+                        newType = r;
+                    }
+                    if (!name.startsWith(random, 0))
+                        continue;
+                    name = name.substring(random.length());
+                    int index = 0;
+                    try {
+                        index = Integer.parseInt(name);
+                    } catch (NumberFormatException e) {
+                        continue; // not a number
+                    }
+                    if (index > 0 && index < OUTER_INSTANCE_COUNT+1) {
+                        newInstance[index-1] = r;
+                    }
+                }
+                if (newType == null) 
+                    throw new Exception("Could not find created type");
+                for (int i=0; i<OUTER_INSTANCE_COUNT; ++i) {
+                    //System.out.println("Read outer=" + i);
+                    if (newInstance[i] == null) 
+                        throw new Exception("Could not find created instance");
+                    if (!g.isInstanceOf(newInstance[i], b.Type))
+                        throw new Exception("Created resource is not an instance of Type");
+                    if (!g.isInstanceOf(newInstance[i], newType))
+                        throw new Exception("Created resource is not an instance of created type");
+                    // TODO: check inner instances
+                }
+            }
+        });
+        
+        checkException();
+        
+    }
+
+}