In this article I would tell you how  to find our the reasons of why cron hangs up and fix them. Read the solution options below.

 
You need to run cron frequently (for example, every 10 minutes). And meet some problems on this way.
Modules launched by cron work with external sites and connection with them can be bad or script …

 
This article would tell you how to create back of database automatically on a regular basis.
Solution (for Unix users):

This article would tell you how to set cron launching.

For the correct functioning, some modules require regular technical maintenance. For example, watchdog module needs to remove old messages and search module needs to index site content.

Solution
Idexing
Decrease number of documents for indexing at one cron launching on the page of search settings. It’s better to run cron a few times a day.
Mailing
If you have simple news then it can …