I need to delete records from an object by clicking on a button. I am calling a Batch job from the Visualforce controller.
Please find the below code :

global class BatchJob implements Database.Batchable<sobject>
{
    global Database.QueryLocator start(Database.BatchableContext BC)
    {
        return Database.getQueryLocator([SELECT Id FROM Account]);
    }
    
    global void execute(Database.BatchableContext BC, List<SObject> lstRecords)
    {
        //To hold the list of error messages
        List<Error_Tracking__c> lstErrorTracking = new List<Error_Tracking__c>();
        Error_Tracking__c objErrorTracking;            //To hold an error message
        
        //To perform bulk delete operation
        Database.DeleteResult[] result = Database.delete(lstRecords, false);

        //Iterating the result
        for(Database.DeleteResult res : result)
        {
               //If status is not success then create error record and insert it into Error_Tracking__c object
            if(!res.isSuccess())
            {
                for(Database.Error err : res.getErrors())
                {
                    objErrorTracking = new Error_Tracking__c();
                    objErrorTracking.Name = res.getId();
                    objErrorTracking.Error_Message__c = err.getMessage();
                    lstErrorTracking.add(objErrorTracking);
                }
            }
        }
        
        if(lstErrorTracking != Null && lstErrorTracking.size() > 0)
        {
            Database.insert(lstErrorTracking,false);
        }
    }
    global void finish(Database.BatchableContext BC) 
    {
        //Query the AsyncApexJob object to retrieve the current job's information.
           AsyncApexJob apexJob = [SELECT Id, Status, NumberOfErrors, JobItemsProcessed, TotalJobItems, CreatedBy.Email
                                  FROM AsyncApexJob WHERE Id =: BC.getJobId()];
            
            //Send an email to the Apex job's submitter notifying of job completion.
            Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
            String[] toAddress = new String[] {apexJob.CreatedBy.Email};
            system.debug('apexJob.CreatedBy.Email : '+apexJob.CreatedBy.Email);
            mail.setToAddresses(toAddress);
            mail.setSubject('Apex Job status is ' + apexJob.Status);
            mail.setPlainTextBody('The batch Apex job processed ' + apexJob.TotalJobItems + ' batches with '+ apexJob.NumberOfErrors + ' failures.');
            Messaging.SingleEmailMessage[] messages = new List<Messaging.SingleEmailMessage> {mail};
            Messaging.SendEmailResult[] results = Messaging.sendEmail(messages);
                
            system.debug('results : '+results);
            if (!results.get(0).isSuccess()) {
                System.StatusCode statusCode = results.get(0).getErrors()[0].getStatusCode();
                String errorMessage = results.get(0).getErrors()[0].getMessage();
            }
        }
    }
}