Nikolay nikpros

When crontab gives fopen: permission denied error

While trying to open my user's crontab on Ubuntu, the system barked back:

$ crontab -l
crontabs/myuser/: fopen: Permission denied

This is due to improper permissions on crontab executable.

	// Нужно разгрузить EventLoop выполняя тяжелую функцию heavyComputationFunction на большом кол-ве данных.
	// P.S. попробовать реализовать по-блочное выполнение функции

	const array2 = [...new Array(100000)].map(() => ({
	...largeDataset,
	}));

	array2.forEach(data => {
	heavyComputationFunction(data)
	});

	queueCb(
	[
	'https://jsonplaceholder.typicode.com/posts/1',
	'https://jsonplaceholder.typicode.com/posts/2',
	'https://jsonplaceholder.typicode.com/posts/4',
	'https://jsonplaceholder.typicode.com/posts/4',
	'https://jsonplaceholder.typicode.com/posts',
	'https://jsonplaceholder.typicode.com/posts/3',
	'https://jsonplaceholder.typicode.com/posts/1',
	],

	mysql -u<user_name> -p<user_password> <db_name> - подключение к БД

	SELECT
	TABLE_NAME,COLUMN_NAME,CONSTRAINT_NAME, REFERENCED_TABLE_NAME,REFERENCED_COLUMN_NAME
	FROM
	INFORMATION_SCHEMA.KEY_COLUMN_USAGE
	WHERE
	REFERENCED_TABLE_SCHEMA = '<db_name>' [AND
	REFERENCED_TABLE_NAME = '<table_name>' ...] - просмотр всех CONSTRAINT таблиц(ы)