Android sqlite reading while transaction running

I am not sure what is the problem and how to handle this.

I have an helper class

    public class DBAdapter {
    public DBAdapter(Context ctx) {
            this.context = ctx;
            DBHelper = DatabaseHelper.getInstance(ctx);
        }

      private static class DatabaseHelper extends SQLiteOpenHelper {
            private static DatabaseHelper mInstance = null;
            DatabaseHelper(Context context) {
                super(context, DATABASE_NAME, null, DATABASE_VERSION);

            }
            public static DatabaseHelper getInstance(Context ctx) {
                if (mInstance == null) {
                    mInstance = new DatabaseHelper(ctx.getApplicationContext());
                    database = mInstance.getWritableDatabase();
                }
                context = ctx;

                return mInstance;
            }
    }

    public void beginTransaction() {
        database.beginTransaction();
        Utils.log("Sqlite=> Begin Transaction");
    }

    public void endTransaction() {
        database.setTransactionSuccessful();
        database.endTransaction();
    }

    public void rollbackTransaction() {
        database.endTransaction();
    }
}

In my app I have an AsyncTask which within doInBackground does something like this:

db.beginTransaction();
//do a lot of insert queries for 5 minutes
db.endTransaction(); //or rollback in case of error

Now the problem I am having is this: while the AsyncTask is running and I have the transaction running, any select query I made, using database.rawQuery fails to run. Debugging it, it seems that the rawQuery command is waiting for the current transaction to finish, to return the results.

How can I have both, the long running transaction and extra read olny queries in the same time?