Change log table delete u0096 datamart delta works?

Hello BW Experts,

Data comes from Source system to ODS and then to the Cube. ODS is used from a long time ( 6 years ). And the change log is huge. We are contemplating on deleting the ODS change log. If the delta load from ODS to Cube ( Datamart )is based on the change log, deleting it would disable the delta capability???

Suggestions appreciated.

Thanks,

BWer