function plt_hide_rvg_optimize_database_menus() {
//Hide the "Tools → Optimize Database" menu.
remove_submenu_page('tools.php', 'rvg-optimize-database');
//Hide the "Settings → Optimize Database" menu.
remove_submenu_page('options-general.php', 'odb_settings_page');
}
add_action('admin_menu', 'plt_hide_rvg_optimize_database_menus', 11);