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I just want to know what each digit means in (String CRON_EXP = '0 0 * * * ?'; ) AND Can you explain what does meaning for below lines.

System.schedule('Hourly', '0 0 * * * ?', new MyHourlySchedule() );  
System.schedule('Start', '0 0 0 10 9 ? 2013' , new MyScheduleStart() );
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    why don't you read doc developer.salesforce.com/docs/atlas.en-us.apexcode.meta/…
    – Ratan Paul
    Jan 29, 2016 at 6:41
  • If is execute System.schedule('Hourly', '0 0 * * * ?', new MyHourlySchedule() ); in anonymous and schedule the Batch apex class every day at 10 PM, will it run every hour for every day, or do we need to do anything to run for every hour for every day Jan 29, 2016 at 8:53
  • If you have further question(s) please ask them in a separate question, not in comments.
    – mkorman
    Jan 29, 2016 at 14:52

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