1. An apparatus for batch processing of data records in an on-demand system, the apparatus comprising: a processor; and a non-transitory computer readable medium storing a plurality of instructions which, when executed by the processor, cause the processor to carry out the steps of: storing a first marker that identifies a first node in an on-demand system and identifies a most recent data record processed in a relational database management system by the first node; storing a second marker that identifies a second node in the on-demand system and identifies a most recent data record processed in the relational database management system by the second node; using the first and second markers to query the database management system to identify a first batch of records for the first node to process and a second batch of records for the second node to process; and processing the first batch of records by the first node to update a first client of data changes reflected by the first batch of records and the second batch of records by the second node to update a second client of data changes reflected by the second batch of records.