A scheduled task configured in Plesk fails with error: PHP Fatal error: Allowed memory size of X bytes exhausted (tried to allocate Y bytes)

Plesk for Linux kb: technical

Applicable to:

Scheduled task fails with error:

PLESK_ERROR: PHP Fatal error: Allowed memory size of X bytes exhausted (tried to allocate Y bytes)
A scheduled task is created at Tools & Settings > Scheduled Tasks with Type Run a command. It should run PHP script and has no limits set with memory_limit directives:

CONFIG_TEXT: /usr/bin/env php "/var/www/vhosts/example.com/httpdocs/index.php" "option1=qq"

PHP memory limit is exceeded.

In case the scheduled task is using the root user identity

Log in to Plesk.
Go to Tools & Settings > Scheduled Tasks and select the affected task.
In the Command field, add the directive memory_limit with required value:

CONFIG_TEXT: /usr/bin/env php "/var/www/vhosts/example.com/httpdocs/index.php" "option1=qq" -d memory_limit=128M

In case the scheduled task is using the domain system user identity

Connect to the server via SSH.
Edit the server-wide PHP configuration file to increase the memory limit, e.g.:

# grep memory_limit /opt/plesk/php/7.3/etc/php.ini
memory_limit = 512M