Cache Clearing and rebuilding methods for Drupal 8

Site URL

1. Go to Administration > Configuration > Development > Performance

 (/admin/config/development/performance)

2. Click on "Clear all caches"

Drush

drush cache-rebuild

OR

drush cr

Programmatically using PHP (From a drupal module) 

db_query("DELETE FROM {cache};");

 

By SQL / phpMyAdmin interface

Clear all tables that start with cache_ (CAUTION : Do not DELETE tables)

Ex:

TRUNCATE cache_config;

TRUNCATE cache_container;

TRUNCATE cache_data;

TRUNCATE cache_default;

TRUNCATE cache_discovery;

TRUNCATE cache_dynamic_page_cache;

TRUNCATE cache_entity;

TRUNCATE cache_menu;

TRUNCATE cache_render;

TRUNCATE cache_toolbar;

Run update.php

Running update.php (/update.php) is another way of clearing the cache.

If you cannot login or have no user 1 rights you will need to set in :

/sites/default/settings.php

$update_free_access = TRUE;  

Do not forget to set this back to FALSE afterwards.

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