Pre populate database upgrate p

I use pre populate database in my android application .when update version apps add new column then my application database not replace new database .so my application crash . if onUpgrate() function call new database and then remove old database and copy new database .my apps is very slow .

public class DatabaseOpenHelper extends SQLiteOpenHelper {
    private static String DB_PATH = "/data/data/http://ift.tt/1D5jkSI";
    private SQLiteDatabase myDataBase;
    private final Context myContext;
    public static final String DB_NAME = "dims.db";


    public DatabaseOpenHelper(Context context) {
        super(context, DB_NAME, null, 4);
        // TODO Auto-generated constructor stub
        this.myContext = context;
    }

    @Override
    public void onCreate(SQLiteDatabase database) {

    }

    @Override
    public void onUpgrade(SQLiteDatabase database, int oldVersion,
            int newVersion) {
        Log.w("Upgrading", "Upgrading application's database from version "
                + oldVersion + " to " + newVersion
                + ", which will destroy all old data!");
        Context context = this.myContext;
        context.deleteDatabase(DB_NAME);

        try {

            updateDataBase();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }



    public void updateDataBase() throws IOException {



        try {
            copyDataBase();
        } catch (IOException e) {
            throw new Error("Error copying database");
        }

    }

    public void createDataBase() throws IOException {

        boolean dbExist = checkDataBase();

        if (dbExist) {

        } else {

            this.getReadableDatabase();

            try {

                copyDataBase();

            } catch (IOException e) {

                throw new Error("Error copying database");

            }
        }

    }



    private boolean checkDataBase() {

        SQLiteDatabase checkDB = null;

        try {
            String myPath = DB_PATH + DB_NAME;
            checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);

        } catch (SQLiteException e) {


        }

        if (checkDB != null) {

            checkDB.close();

        }

        return checkDB != null ? true : false;
    }


    private void copyDataBase() throws IOException {

        // Open your local db as the input stream
        InputStream myInput = myContext.getAssets().open(DB_NAME);

        // Path to the just created empty db
        String outFileName = DB_PATH + DB_NAME;

        // Open the empty db as the output stream
        OutputStream myOutput = new FileOutputStream(outFileName);

        // transfer bytes from the inputfile to the outputfile
        byte[] buffer = new byte[1024];
        int length;
        while ((length = myInput.read(buffer)) > 0) {
            myOutput.write(buffer, 0, length);
        }


        myOutput.flush();
        myOutput.close();
        myInput.close();

    }

    public void openDataBase() throws SQLException {


        String myPath = DB_PATH + DB_NAME;
        myDataBase = SQLiteDatabase.openDatabase(myPath, null,
                SQLiteDatabase.OPEN_READONLY);

    }

    @Override
    public synchronized void close() {

        if (myDataBase != null)
            myDataBase.close();

        super.close();

    }
}