diff --git a/source/de/anomic/kelondro/blob/BLOBArray.java b/source/de/anomic/kelondro/blob/BLOBArray.java
index 9f4e5eef2..8244001b3 100755
--- a/source/de/anomic/kelondro/blob/BLOBArray.java
+++ b/source/de/anomic/kelondro/blob/BLOBArray.java
@@ -156,11 +156,44 @@ public class BLOBArray implements BLOB {
             if (b.location.equals(location)) {
                 i.remove();
                 b.blob.close(writeIDX);
+                b.blob = null;
+                b.location = null;
                 return;
             }
         }
     }
     
+    private File unmount(int idx) {
+        blobItem b = this.blobs.remove(idx);
+        b.blob.close(false);
+        b.blob = null;
+        File f = b.location;
+        b.location = null;
+        return f;
+    }
+    
+    public synchronized File[] unmountBestMatch(double maxq) {
+        double l, r, min = Double.MAX_VALUE;
+        int[] idx = new int[2];
+        for (int i = 0; i < this.blobs.size() - 1; i++) {
+            for (int j = i + 1; j < this.blobs.size(); j++) {
+                l = this.blobs.get(i).location.length();
+                r = this.blobs.get(j).location.length();
+                double q = Math.max(l/r, r/l);
+                if (q < min) {
+                    min = q;
+                    idx[0] = i;
+                    idx[1] = j;
+                }
+            }
+        }
+        if (min > maxq) return null;
+        File[] bestmatch = new File[]{this.blobs.get(idx[0]).location, this.blobs.get(idx[1]).location};
+        unmount(idx[1]);
+        unmount(idx[0]);
+        return bestmatch;
+    }
+    
     public synchronized File unmountSmallestBLOB() {
         if (this.blobs.size() == 0) return null;
         int bestIndex = -1;
@@ -171,20 +204,14 @@ public class BLOBArray implements BLOB {
                 bestIndex = i;
             }
         }
-        blobItem b = this.blobs.remove(bestIndex);
-        b.blob.close(false);
-        b.blob = null;
-        return b.location;
+        return unmount(bestIndex);
     }
     
     public synchronized File unmountOldestBLOB(boolean smallestFromFirst2) {
         if (this.blobs.size() == 0) return null;
         int idx = 0;
         if (smallestFromFirst2 && this.blobs.get(1).location.length() < this.blobs.get(0).location.length()) idx = 1;
-        blobItem b = this.blobs.remove(idx);
-        b.blob.close(false);
-        b.blob = null;
-        return b.location;
+        return unmount(idx);
     }
     
     public synchronized File unmountSimilarSizeBLOB(long otherSize) {
@@ -202,10 +229,7 @@ public class BLOBArray implements BLOB {
                 bestIndex = i;
             }
         }
-        b = this.blobs.remove(bestIndex);
-        b.blob.close(false);
-        b.blob = null;
-        return b.location;
+        return unmount(bestIndex);
     }
     
     /**
diff --git a/source/de/anomic/kelondro/blob/HeapReader.java b/source/de/anomic/kelondro/blob/HeapReader.java
index e0305fb71..8d55c1b45 100644
--- a/source/de/anomic/kelondro/blob/HeapReader.java
+++ b/source/de/anomic/kelondro/blob/HeapReader.java
@@ -48,7 +48,7 @@ public class HeapReader {
     protected int                keylength;  // the length of the primary key
     protected LongHandleIndex    index;      // key/seek relation for used records
     protected Gap                free;       // set of {seek, size} pairs denoting space and position of free records
-    protected final File         heapFile;   // the file of the heap
+    protected File               heapFile;   // the file of the heap
     protected final ByteOrder    ordering;   // the ordering on keys
     protected CachedRandomAccess file;       // a random access to the file
     
@@ -280,6 +280,7 @@ public class HeapReader {
     public synchronized void close() {
         if (file != null) file.close();
         file = null;
+        heapFile = null;
         free.clear();
         free = null;
         index.close();
diff --git a/source/de/anomic/kelondro/io/CachedRandomAccess.java b/source/de/anomic/kelondro/io/CachedRandomAccess.java
index a10af403d..6dbc23f7f 100644
--- a/source/de/anomic/kelondro/io/CachedRandomAccess.java
+++ b/source/de/anomic/kelondro/io/CachedRandomAccess.java
@@ -131,6 +131,7 @@ public final class CachedRandomAccess extends AbstractRandomAccess implements Ra
         } catch (IOException e) {
             e.printStackTrace();
         }
+        this.file = null;
         this.cache = null;
         this.RAFile = null;
     }
diff --git a/source/de/anomic/kelondro/text/IndexCell.java b/source/de/anomic/kelondro/text/IndexCell.java
index 3e9c2f9d7..9b4e3cf00 100644
--- a/source/de/anomic/kelondro/text/IndexCell.java
+++ b/source/de/anomic/kelondro/text/IndexCell.java
@@ -281,8 +281,7 @@ public final class IndexCell extends AbstractBufferedIndex implements BufferedIn
     
     private synchronized void cacheCleanup() throws IOException {
         if (this.lastCleanup + cleanupCycle > System.currentTimeMillis()) return;
-        int c = 0;
-        if (this.array.entries() > this.maxArrayFiles && c++ < 3) {
+        if (this.array.entries() > this.maxArrayFiles) {
             this.array.shrink(true);
         }
     }
diff --git a/source/de/anomic/kelondro/text/ReferenceContainerArray.java b/source/de/anomic/kelondro/text/ReferenceContainerArray.java
index 0e27c2576..af3a3ba36 100644
--- a/source/de/anomic/kelondro/text/ReferenceContainerArray.java
+++ b/source/de/anomic/kelondro/text/ReferenceContainerArray.java
@@ -247,13 +247,30 @@ public final class ReferenceContainerArray {
     public synchronized boolean shrink(boolean similar) throws IOException {
         if (this.array.entries() < 2) return false;
         if (this.merger.queueLength() > 0) return false;
-        File f1 = this.array.unmountOldestBLOB(similar);
-        if (f1.length() == 0) {
-            FileUtils.deletedelete(f1);
-            return true;
+        File[] ff = this.array.unmountBestMatch(2.0);
+        if (ff == null) {
+            ff = new File[2];
+            ff[0] = this.array.unmountSmallestBLOB();
+            if (ff[0].length() == 0) {
+                FileUtils.deletedelete(ff[0]);
+                return true;
+            }
+            ff[1] = this.array.unmountSmallestBLOB();
+            if (ff[1].length() == 0) {
+                this.array.mountBLOB(ff[0]);
+                FileUtils.deletedelete(ff[1]);
+                return true;
+            }
+            /*
+            ff[0] = this.array.unmountOldestBLOB(similar);
+            if (ff[0].length() == 0) {
+                FileUtils.deletedelete(ff[0]);
+                return true;
+            }
+            ff[1] = (similar) ? this.array.unmountSimilarSizeBLOB(ff[0].length()) : this.array.unmountOldestBLOB(false);
+            */
         }
-        File f2 = (similar) ? this.array.unmountSimilarSizeBLOB(f1.length()) : this.array.unmountOldestBLOB(false);
-        merger.merge(f1, f2, this.array, this.payloadrow, newContainerBLOBFile());
+        merger.merge(ff[0], ff[1], this.array, this.payloadrow, newContainerBLOBFile());
         return true;
     }