diff --git a/src/main/org/guinsoo/ConnectionBuilder.java b/src/main/org/guinsoo/ConnectionBuilder.java
index 8d057ff..4c7349e 100644
--- a/src/main/org/guinsoo/ConnectionBuilder.java
+++ b/src/main/org/guinsoo/ConnectionBuilder.java
@@ -48,6 +48,7 @@
  * @author cius.ji
  * @since 1.8+
  */
+@Deprecated
 public class ConnectionBuilder {
     /**
      * database url
diff --git a/src/main/org/guinsoo/engine/Engine.java b/src/main/org/guinsoo/engine/Engine.java
index 461d05d..9bb6650 100644
--- a/src/main/org/guinsoo/engine/Engine.java
+++ b/src/main/org/guinsoo/engine/Engine.java
@@ -69,20 +69,19 @@ private static SessionLocal openSession(ConnectionInfo ci, boolean ifExists, boo
                     String p = ci.getProperty("MV_STORE");
                     String fileName;
                     if (p == null) {
-                        String store = ci.getStore();
-                        if (Constants.MV_DB.equals(store)) {
-                            fileName = name + Constants.SUFFIX_MV_FILE;
-                        } else if (Constants.PAGE_DB.equals(store)) {
-                            fileName = name + Constants.SUFFIX_PAGE_FILE;
-                            ci.setProperty("MV_STORE", "FALSE");
-                        } else if (Constants.QUICK_DB.equals(store)) {
-                            fileName = name + Constants.SUFFIX_QUICK_FILE;
-                            ci.setProperty("MV_STORE", "FALSE");
-                        } else {
-                            throw DbException.getUnsupportedException("Unsupported DB Engine");
-                        }
+                        fileName = name + Constants.SUFFIX_MV_FILE;
                         if (!FileUtils.exists(fileName)) {
-                            FileUtils.createFile(fileName);
+                            fileName = name + Constants.SUFFIX_PAGE_FILE;
+                            if (FileUtils.exists(fileName)) {
+                                ci.setProperty("MV_STORE", "false");
+                            } else {
+                                throwNotFound(ifExists, forbidCreation, name);
+                                fileName = name + Constants.SUFFIX_OLD_DATABASE_FILE;
+                                if (FileUtils.exists(fileName)) {
+                                    throw DbException.getFileVersionError(fileName);
+                                }
+                                fileName = null;
+                            }
                         }
                     } else {
                         fileName = name + (Utils.parseBoolean(p, true, false) ? Constants.SUFFIX_MV_FILE
diff --git a/src/test/org/guinsoo/samples/QuickUsage.java b/src/test/org/guinsoo/samples/QuickUsage.java
index 70a4614..097adf9 100644
--- a/src/test/org/guinsoo/samples/QuickUsage.java
+++ b/src/test/org/guinsoo/samples/QuickUsage.java
@@ -19,9 +19,8 @@
 
 package org.guinsoo.samples;
 
-import org.guinsoo.ConnectionBuilder;
-
 import java.sql.Connection;
+import java.sql.DriverManager;
 import java.sql.Statement;
 
 /**
@@ -34,11 +33,9 @@ public class QuickUsage {
 
     public static void main(String[] args) throws Exception {
 
-        String url = "jdbc:guinsoo:mem:;STORE=3";
+        String url = "jdbc:guinsoo:file:/Users/admin/Git/Private/grist-modeling/examples/xxx;MODE=PostgreSQL";
 
-        Connection conn = ConnectionBuilder.getInstance()
-                .setUrl(url)
-                .build();
+        Connection conn = DriverManager.getConnection(url, "sa", "sa");
 
         Statement stmt = conn.createStatement();