TestMultiThreaded: make it harder

h2/src/test/org/h2/test/synth/TestMultiThreaded.java

@@ -135,7 +135,7 @@ public class TestMultiThreaded extends TestDb {
     @Override
     public void test() throws Exception {
         deleteDb("multiThreaded");
-        int size = getSize(2, 4);
+        int size = getSize(2, 20);
         Connection[] connList = new Connection[size];
         for (int i = 0; i < size; i++) {
             connList[i] = getConnection("multiThreaded;MULTI_THREADED=1");