What about the meaning of "Star" in data collection of dataware house

In dataware house data collection task of RTC, we find there are two items for jts, one is Star, and another is common. But we do not know what data will be collected after the Star data collection job run, if we stop this job, will it impact our report in RTC? As our understanding, only the data collection job in CCM is related with our report in RTC. Is it correct? Currently, each time, the Star data collection job will take at about 37 minutes to finish the data collection, will this time increase with the project area number increase? Thanks a lot!