How to find specific record Id failed in Salesforce Batch?

Hi Tanu,

Implementing Database.stateful in your Batch class can help you in getting Failed Record id in Your Batch operation.

global class NBTypeBatchUpdate implements Database.Batchable<sObject>, Database.Stateful {

global String log = ''; // stateful variable to keep track of errors across batches
global Database.QueryLocator start(Database.BatchableContext BC)
{
String query = 'SELECT Id, Name, NBType__c ';
query += 'FROM Opportunity ';
query += 'WHERE ContractStartDate__c != null ';
query += 'AND ContractStartDate__c > 2014-01-01 ';
//query += 'AND NBType__c != null ';

return Database.getQueryLocator(query);
}

global void execute(Database.BatchableContext BC, List<sObject> scope)
{
system.debug('Processing ' + scope.size() + ' opportunities');

for (Opportunity opportunity : (List<Opportunity>)scope){
system.debug('Processing ' + opportunity.Name);
opportunity.NBType__c = null;
}

Database.SaveResult[] srList = database.update(scope, false); // allOrNone = false
for (Integer i = 0; i < srList.size(); i++)
if (!srList[i].isSuccess())
this.log += '\n Error in Opportunity: ' + scope[i].name + '. Error msg=' +
srList[i].getErrors()[0].getMessage();

This code may help You.

Thanks