How t ocorrect Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 2097160 bytes) in /home2/sierrbg4/public_html/wp-includes/wp-db.php on line 2726 code example

Example: Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 119541600 bytes) in C:\xampp\htdocs\backup-vice.php on line 67

<?php 
ini_set('memory_limit', '1024M'); // or you could use 1G

?>