Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 81920 bytes) in /home/u183637501/domains/renvexa.com/public_html/wp-includes/class-wpdb.php on line 2357

WordPress database error: [Commands out of sync; you can't run this command now]
SELECT option_name, option_value FROM wp_options WHERE option_name IN ('_transient_timeout_doing_cron')

WordPress database error: [Commands out of sync; you can't run this command now]
SELECT autoload FROM wp_options WHERE option_name = '_transient_doing_cron' LIMIT 1

WordPress database error: [Commands out of sync; you can't run this command now]
SHOW FULL COLUMNS FROM `wp_options`