if(SyncTrack.isEmpty()==false)
 {  Boolean isExecuting = ([SELECT COUNT()
                FROM AsyncApexJob
               WHERE ApexClassId IN (
                                SELECT Id
                                  FROM ApexClass
                                 WHERE Name = 'AckCallUpdatenew')] == 0) ? false : true ;
if(isExecuting){
    return;
}
Database.executeBatch(new AckCallUpdatenew(),1);
 }