Batch Class:

global class accountBatch implements Database.Batchable<sobject> {
  
    global Database.QueryLocator start(Database.BatchableContext bc){
      
        String query = 'SELECT Id, Name FROM Account';
        return Database.getQueryLocator(query);
    }
      
    global void execute(Database.BatchableContext bc, List<account> scope) {
      
        for(Account a : scope) {
            a.Name = a.Name + 'Updated';
        }
        update scope;
    } 
      
    global void finish(Database.BatchableContext bc) {
      
    }
}

Scheduled Class:

global class accountBatchSchedule implements Schedulable{
	global void execute(SchedulableContext sc) {
		//invoke the batch class
        Database.executeBatch(new accountBatch());
    }
}

There are 2 ways to schedule an apex job:

• Scheduling a Job from the UI
• Using the System.Schedule Method

Go to Setup | Apex Class | Click Schedule Apex

• Enter Job name and select Apex Scheduled Schedulable.
• Select the Schedulable frequency Weekly or Monthly as per your requirement.
• Select the start and end dates.
• Select preferred start time.
• Click on Save.