big data in stata

Thanks for reading :wave: I am a beginner :confused: and trying to make descriptive tables. I am trying to create an 18x18 cross-table. The 18 variables are disease areas and I would like to see which disease areas are likely to overlap. The 18 variables are set up 0/1 and I would only...

I am currently using a large dataset of around 30million observations (around 30GB) and Stata is getting very slow in implementing any simple command. it took for ex one hour to merge two parts of this dataset with the append command. any idea on why it is so slow? or on how to set stata so that...