Sample Code:


Batch Class:


global class CaseEscalation implements Database.Batchable <sObject>{
    global Database.QueryLocator start(Database.BatchableContext bc){
        String SOQL = ‘SELECT Id, IsEscalated FROM Case WHERE Status = ‘High’ AND IsEscalated = False’;
        return Database.getQueryLocator(SOQL);
    }
   
    global void execute(Database.BatchableContext bc, List<Case> caseList){
        for(Case c : caseList){
            c.IsEscalated = true;
        }
        update caseList;
    }
   
    global void finish(Database.BatchableContext bc){
    }
}

Schedulable Class:

global class CaseEscalationSchedule implements Schedulable{
    global void execute(SchedulableContext sc){
        CaseEscalation ce = new CaseEscalation();
        Database.executeBatch(ce);
    }
}