function system_update_8403

Delete all cache_* tables. They are recreated on demand with the new schema.

File

core/modules/system/system.install, line 2440

Code

function system_update_8403() {
    foreach (Cache::getBins() as $bin => $cache_backend) {
        // Try to delete the table regardless of which cache backend is handling it.
        // This is to ensure the new schema is used if the configuration for the
        // backend class is changed after the update hook runs.
        $table_name = "cache_{$bin}";
        $schema = Database::getConnection()->schema();
        if ($schema->tableExists($table_name)) {
            $schema->dropTable($table_name);
        }
    }
}