Hi,

I am trying to update user in a batch apex and when there is any error I am trying capture those and store in a custom object but I am getting Mixed DML operation error.

Here is the flow:

• Contact Updated during the course of the day
• All contacts are flagged for nightly processing
• At the mid night my Batch apex picks up those contact and then verify existence of portal user for them.
• If portal user exist and there is change in the email then i want to update username and email both
• If any error occur like Username already exist, duplicate user etcs I want to track in custom object.

Please suggest.

Snip of code:

Batch Apex: 

Database.SaveResult[] updateResult = Database.update(lstUserToUpdate,false); 
ExpectionTrackingCls.getErrorStatus(lstUserToUpdate,updateResult); 

ExpectionTrackingCls

public static void getErrorStatus(List<User> lstUser,LIST<Database.SaveResult> dbSaveResult)
    {
        List<Errorlog__c> errObj=new List<Errorlog__c>();
        for(Database.SaveResult sr : dbSaveResult){ 
            if (sr.isSuccess()==false) 
            {              
				for(Database.Error err : errs)
				{
					Errorlog__c newErrorRecord = new Errorlog__c();
					newErrorRecord.name = lstUser[i].username;
					newErrorRecord.message__c = err.getMessage()+err.getStatusCode();
					errObj.add(newErrorRecord);
				}
            }
        }
	}