Hi Arthur,
Data is typically only stored in this table temporarily before it is sent on to your configured ‘outputs’ by the Data Gateways process, at which point it should be deleted. If you're seeing this table grow to a very large size, it may be due to your DG settings -- I'd recommend review of
this KB article for more info on these settings and this scenario as a first step. If you'd need guidance on maintaining this table by either clearing down the data with the help of your DBA, or determining your options for in-product settings, I'd suggest to open a Support ticket with us so we could investigate further.