diff --git a/jastadd-mquat-base/src/main/resources/newAccessPaths.json b/jastadd-mquat-base/src/main/resources/newAccessPaths.json
new file mode 100644
index 0000000000000000000000000000000000000000..0b4967610cbe776f6715128eb28d88adc7986139
--- /dev/null
+++ b/jastadd-mquat-base/src/main/resources/newAccessPaths.json
@@ -0,0 +1,1162 @@
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+        "insert": 0.00041025,
+        "link": 6.62891e-06,
+        "lookup": 0.002988,
+        "scan": 0.000101438,
+        "storageSize": 65536.0
+      },
+      {
+        "dataSize": 64,
+        "insert": 0.000394094,
+        "link": 1.28047e-05,
+        "lookup": 0.025604,
+        "scan": 9.99375e-05,
+        "storageSize": 65536.0
+      },
+      {
+        "dataSize": 128,
+        "insert": 0.000335188,
+        "link": 2.60508e-05,
+        "lookup": 0.011065,
+        "scan": 9.59141e-05,
+        "storageSize": 65536.0
+      },
+      {
+        "dataSize": 256,
+        "insert": 0.000268305,
+        "link": 4.7168e-05,
+        "lookup": 0.021653,
+        "scan": 9.51367e-05,
+        "storageSize": 65536.0
+      },
+      {
+        "dataSize": 512,
+        "insert": 0.0003245,
+        "link": 9.49219e-05,
+        "lookup": 0.042458,
+        "scan": 9.44746e-05,
+        "storageSize": 65536.0
+      },
+      {
+        "dataSize": 1024,
+        "insert": 0.000314408,
+        "link": 9.54141e-05,
+        "lookup": 0.085146,
+        "scan": 9.32959e-05,
+        "storageSize": 65536.0
+      },
+      {
+        "dataSize": 2048,
+        "insert": 0.000304473,
+        "link": 9.48047e-05,
+        "lookup": 0.169781,
+        "scan": 9.36162e-05,
+        "storageSize": 65536.0
+      },
+      {
+        "dataSize": 4096,
+        "insert": 0.000310594,
+        "link": 8.8457e-05,
+        "lookup": 0.329261,
+        "scan": 9.42874e-05,
+        "storageSize": 65536.0
+      },
+      {
+        "dataSize": 8192,
+        "insert": 0.000310583,
+        "link": 8.94883e-05,
+        "lookup": 0.683663,
+        "scan": 9.2675e-05,
+        "storageSize": 131072.0
+      },
+      {
+        "dataSize": 16384,
+        "insert": 0.000310106,
+        "link": 9.26758e-05,
+        "lookup": 1.30593,
+        "scan": 9.32053e-05,
+        "storageSize": 262144.0
+      },
+      {
+        "dataSize": 32768,
+        "insert": 0.000301713,
+        "link": 8.3168e-05,
+        "lookup": 2.60836,
+        "scan": 8.98364e-05,
+        "storageSize": 524288.0
+      },
+      {
+        "dataSize": 65536,
+        "insert": 0.000300155,
+        "link": 9.18594e-05,
+        "lookup": 5.31677,
+        "scan": 9.02301e-05,
+        "storageSize": 983040.0
+      },
+      {
+        "dataSize": 131072,
+        "insert": 0.000298739,
+        "link": 9.71641e-05,
+        "lookup": 10.5485,
+        "scan": 8.97728e-05,
+        "storageSize": 1900540.0
+      },
+      {
+        "dataSize": 262144,
+        "insert": 0.000299004,
+        "link": 9.23672e-05,
+        "lookup": 21.0137,
+        "scan": 9.00453e-05,
+        "storageSize": 3801090.0
+      },
+      {
+        "dataSize": 524288,
+        "insert": 0.000425368,
+        "link": 9.55664e-05,
+        "lookup": 41.2742,
+        "scan": 0.000136086,
+        "storageSize": 7536640.0
+      },
+      {
+        "dataSize": 1048576,
+        "insert": 0.000330615,
+        "link": 9.45312e-05,
+        "lookup": 83.4139,
+        "scan": 0.00011054,
+        "storageSize": 15073300.0
+      },
+      {
+        "dataSize": 2097152,
+        "insert": 0.000471611,
+        "link": 9.74297e-05,
+        "lookup": 220.957,
+        "scan": 0.000132221,
+        "storageSize": 30081000.0
+      },
+      {
+        "dataSize": 4194304,
+        "insert": 0.000383419,
+        "link": 9.49531e-05,
+        "lookup": 442.979,
+        "scan": 0.000106912,
+        "storageSize": 60096500.0
+      },
+      {
+        "dataSize": 8388608,
+        "insert": 0.000352057,
+        "link": 0.000100293,
+        "lookup": 784.412,
+        "scan": 0.000107329,
+        "storageSize": 120193000.0
+      },
+      {
+        "dataSize": 16777216,
+        "insert": 0.000384641,
+        "link": 9.75938e-05,
+        "lookup": 1825.97,
+        "scan": 0.000120202,
+        "storageSize": 240321000.0
+      },
+      {
+        "dataSize": 33554432,
+        "insert": 0.00036909,
+        "link": 9.49492e-05,
+        "lookup": 3295.74,
+        "scan": 0.000116739,
+        "storageSize": 480575000.0
+      },
+      {
+        "dataSize": 67108864,
+        "insert": 0.000379141,
+        "link": 9.85859e-05,
+        "lookup": 6809.25,
+        "scan": 0.000110863,
+        "storageSize": 961151000.0
+      }
+    ],
+    "properties": {
+      "attributeCount": "dynamic",
+      "attributeNull": 1,
+      "attributeUndefined": 1,
+      "dynamicAttributeSize": 1,
+      "indexAttributeCount": 0,
+      "indexOrderPreserving": 0
+    }
+  },
+  {
+    "addressingMode": "index",
+    "dynamic": false,
+    "id": 4,
+    "name": "RB-Tree",
+    "performances": [
+      {
+        "dataSize": 1,
+        "insert": 0.002594,
+        "link": 0.0,
+        "lookup": 0.001113,
+        "scan": 0.0,
+        "storageSize": 16384.0
+      },
+      {
+        "dataSize": 2,
+        "insert": 0.000886,
+        "link": 0.0,
+        "lookup": 0.000513,
+        "scan": 0.0,
+        "storageSize": 16384.0
+      },
+      {
+        "dataSize": 4,
+        "insert": 0.0006,
+        "link": 0.0,
+        "lookup": 0.000467,
+        "scan": 0.0,
+        "storageSize": 16384.0
+      },
+      {
+        "dataSize": 8,
+        "insert": 0.00061075,
+        "link": 0.0,
+        "lookup": 0.000504,
+        "scan": 0.0,
+        "storageSize": 16384.0
+      },
+      {
+        "dataSize": 16,
+        "insert": 0.000623375,
+        "link": 0.0,
+        "lookup": 0.000715,
+        "scan": 0.0,
+        "storageSize": 16384.0
+      },
+      {
+        "dataSize": 32,
+        "insert": 0.000682375,
+        "link": 0.0,
+        "lookup": 0.000621,
+        "scan": 0.0,
+        "storageSize": 16384.0
+      },
+      {
+        "dataSize": 64,
+        "insert": 0.000779875,
+        "link": 0.0,
+        "lookup": 0.000734,
+        "scan": 0.0,
+        "storageSize": 16384.0
+      },
+      {
+        "dataSize": 128,
+        "insert": 0.000789516,
+        "link": 0.0,
+        "lookup": 0.000823,
+        "scan": 0.0,
+        "storageSize": 16384.0
+      },
+      {
+        "dataSize": 256,
+        "insert": 0.00085157,
+        "link": 0.0,
+        "lookup": 0.000854,
+        "scan": 0.0,
+        "storageSize": 32768.0
+      },
+      {
+        "dataSize": 512,
+        "insert": 0.000891121,
+        "link": 0.0,
+        "lookup": 0.001341,
+        "scan": 0.0,
+        "storageSize": 49152.0
+      },
+      {
+        "dataSize": 1024,
+        "insert": 0.000890621,
+        "link": 0.0,
+        "lookup": 0.001523,
+        "scan": 0.0,
+        "storageSize": 81920.0
+      },
+      {
+        "dataSize": 2048,
+        "insert": 0.000967129,
+        "link": 0.0,
+        "lookup": 0.001585,
+        "scan": 0.0,
+        "storageSize": 147456.0
+      },
+      {
+        "dataSize": 4096,
+        "insert": 0.00105048,
+        "link": 0.0,
+        "lookup": 0.001655,
+        "scan": 0.0,
+        "storageSize": 278528.0
+      },
+      {
+        "dataSize": 8192,
+        "insert": 0.00116575,
+        "link": 0.0,
+        "lookup": 0.002024,
+        "scan": 0.0,
+        "storageSize": 540672.0
+      },
+      {
+        "dataSize": 16384,
+        "insert": 0.00119779,
+        "link": 0.0,
+        "lookup": 0.002883,
+        "scan": 0.0,
+        "storageSize": 1064960.0
+      },
+      {
+        "dataSize": 32768,
+        "insert": 0.00129068,
+        "link": 0.0,
+        "lookup": 0.002639,
+        "scan": 0.0,
+        "storageSize": 2113540.0
+      },
+      {
+        "dataSize": 65536,
+        "insert": 0.00134856,
+        "link": 0.0,
+        "lookup": 0.002998,
+        "scan": 0.0,
+        "storageSize": 4210690.0
+      },
+      {
+        "dataSize": 131072,
+        "insert": 0.00140771,
+        "link": 0.0,
+        "lookup": 0.003099,
+        "scan": 0.0,
+        "storageSize": 8404990.0
+      },
+      {
+        "dataSize": 262144,
+        "insert": 0.00147802,
+        "link": 0.0,
+        "lookup": 0.003351,
+        "scan": 0.0,
+        "storageSize": 16793600.0
+      },
+      {
+        "dataSize": 524288,
+        "insert": 0.00216068,
+        "link": 0.0,
+        "lookup": 0.003712,
+        "scan": 0.0,
+        "storageSize": 33570800.0
+      },
+      {
+        "dataSize": 1048576,
+        "insert": 0.00235016,
+        "link": 0.0,
+        "lookup": 0.004077,
+        "scan": 0.0,
+        "storageSize": 67125200.0
+      },
+      {
+        "dataSize": 2097152,
+        "insert": 0.0022822,
+        "link": 0.0,
+        "lookup": 0.004016,
+        "scan": 0.0,
+        "storageSize": 134234000.0
+      },
+      {
+        "dataSize": 4194304,
+        "insert": 0.00209937,
+        "link": 0.0,
+        "lookup": 0.003978,
+        "scan": 0.0,
+        "storageSize": 268452000.0
+      },
+      {
+        "dataSize": 8388608,
+        "insert": 0.00225131,
+        "link": 0.0,
+        "lookup": 0.005625,
+        "scan": 0.0,
+        "storageSize": 536887000.0
+      },
+      {
+        "dataSize": 16777216,
+        "insert": 0.00230932,
+        "link": 0.0,
+        "lookup": 0.004835,
+        "scan": 0.0,
+        "storageSize": 1073760000.0
+      },
+      {
+        "dataSize": 33554432,
+        "insert": 0.00245877,
+        "link": 0.0,
+        "lookup": 0.011483,
+        "scan": 0.0,
+        "storageSize": 2147500000.0
+      },
+      {
+        "dataSize": 67108864,
+        "insert": 0.00261152,
+        "link": 0.0,
+        "lookup": 0.005536,
+        "scan": 0.0,
+        "storageSize": 4294980000.0
+      }
+    ],
+    "properties": {
+      "attributeCount": 0,
+      "attributeNull": 0,
+      "attributeUndefined": 0,
+      "dynamicAttributeSize": 0,
+      "indexAttributeCount": 1,
+      "indexOrderPreserving": 1
+    }
+  }
+]
\ No newline at end of file
diff --git a/jastadd-mquat-eris/src/main/java/de/tudresden/inf/st/mquat/eris/ErisMQuATBuilder.java b/jastadd-mquat-eris/src/main/java/de/tudresden/inf/st/mquat/eris/ErisMQuATBuilder.java
index 8a3a0226aedeb13944de943c546e660cd55a4c60..d377b7796daf9d638ca2b449e74fa0b5e676d79b 100644
--- a/jastadd-mquat-eris/src/main/java/de/tudresden/inf/st/mquat/eris/ErisMQuATBuilder.java
+++ b/jastadd-mquat-eris/src/main/java/de/tudresden/inf/st/mquat/eris/ErisMQuATBuilder.java
@@ -215,6 +215,15 @@ public class ErisMQuATBuilder {
                 new LiteralExpression(1D)
             ));
           }
+          // if the attribute has a dynamic length, require a dynamic attribute size
+          if (attribute.getTypeLength() == 0) {
+            directOrIndirectImplementation.addClause(new Clause(
+                ClauseType.REQUIRING,
+                new PropertyResourceDesignator(directOrIndirectAccessPathInstance.createRef(), dynamicAttributeSize.createRef()),
+                ClauseComparator.EQ,
+                new LiteralExpression(1D)
+            ));
+          }
 
           // create the provisions
 
@@ -282,6 +291,15 @@ public class ErisMQuATBuilder {
                   new LiteralExpression(1D)
               ));
             }
+            // if the attribute has a dynamic length, require a dynamic attribute size
+            if (attribute.getTypeLength() == 0) {
+              indexImplementation.addClause(new Clause(
+                  ClauseType.REQUIRING,
+                  new PropertyResourceDesignator(indexAccessPathInstance.createRef(), dynamicAttributeSize.createRef()),
+                  ClauseComparator.EQ,
+                  new LiteralExpression(1D)
+              ));
+            }
 
             {
               MultExpression lookups = new MultExpression(new LiteralExpression(num_lookups), new PropertyResourceDesignator(indexAccessPathInstance.createRef(), lookupProperties.get(lookupsize).createRef()));
diff --git a/jastadd-mquat-eris/src/main/java/de/tudresden/inf/st/mquat/eris/coupling/ERISAttribute.java b/jastadd-mquat-eris/src/main/java/de/tudresden/inf/st/mquat/eris/coupling/ERISAttribute.java
index fbad9c6b03bd7de66e4213e2f6ec58e8032666f8..17f95fe2bb4dc4535382777a5b9eca61bb392218 100644
--- a/jastadd-mquat-eris/src/main/java/de/tudresden/inf/st/mquat/eris/coupling/ERISAttribute.java
+++ b/jastadd-mquat-eris/src/main/java/de/tudresden/inf/st/mquat/eris/coupling/ERISAttribute.java
@@ -26,7 +26,7 @@ public class ERISAttribute {
     typeLength = jsonObject.getInt("typeLength");
     unique = jsonObject.getBoolean("unique");
     allowIndex = jsonObject.getBoolean("allowIndex");
-    allowIndex = allowIndex && notNull && notUndefined;
+    allowIndex = allowIndex && notNull && notUndefined && (typeLength > 0);
     this.container = container;
   }