Redirect to upgrade.php

Thanks I found the solution here and it is solved. Thank you.
https://www.cyberciti.biz/faq/how-to-flush-redis-cache-and-delete-everything-using-the-cli/

@rheinwebcom Thanks.

Hi @tillkruess

Do you refer to the snippet below. Where should i put it? Sorry in advance if the question is too stupid. Thank you so much.

/**
* Fix a race condition in alloptions caching
*
* See https://core.trac.wordpress.org/ticket/31245
*/
function _wpcom_vip_maybe_clear_alloptions_cache( $option ) {
if ( ! wp_installing() ) {
$alloptions = wp_load_alloptions(); //alloptions should be cached at this point
if ( isset( $alloptions[ $option ] ) ) { //only if option is among alloptions
wp_cache_delete( ‘alloptions’, ‘options’ );
}
}
}
add_action( ‘added_option’, ‘_wpcom_vip_maybe_clear_alloptions_cache’ );
add_action( ‘updated_option’, ‘_wpcom_vip_maybe_clear_alloptions_cache’ );
add_action( ‘deleted_option’, ‘_wpcom_vip_maybe_clear_alloptions_cache’ );