Bugfix - Release MVStore lock and file resources rightly even if errors

such as OOM when compacting MVStore

h2/src/main/org/h2/mvstore/MVStoreTool.java

@@ -485,6 +485,12 @@ public class MVStoreTool {
                 fileName(sourceFileName).
                 readOnly().
                 open();
+        // Bugfix - Add double "try-finally" statements to close source and target stores for
+        //releasing lock and file resources in these stores even if OOM occurs.
+        // Fix issues such as "Cannot delete file "/h2/data/test.mv.db.tempFile" [90025-197]"
+        //when client connects to this server and reopens this store database in this process.
+        // @since 2018-09-13 little-pan
+        try{
             FileUtils.delete(targetFileName);
             MVStore.Builder b = new MVStore.Builder().
                 fileName(targetFileName);
@@ -492,10 +498,15 @@ public class MVStoreTool {
                 b.compress();
             }
             MVStore target = b.open();
+            try{
                 compact(source, target);
+            }finally{
                 target.close();
+            }
+        }finally{
             source.close();
         }
+    }
 
     /**
      * Copy all live pages from the source store to the target store.