For practical purposes the number of columns is limited by the amount of ram. You won't hit another hard-coded limit before running out of ram. As far as I know that goes for drill down levels as well.
Another limit you may run into first is performance. You can create a chart with 10 thousand dimensions, but it won't move an inch.
Perfect answer ...great ...I have a one question for example I have 4 gb ram how many columns I Wil insert in qlik view and how many levels I Will create in dril down...?can we assume that
No idea. If you have 1 row of data in 100.000 columns you may have a completely non-functional application. Or not. And the same applies if you have 1 column and 3 billion rows of unique values. There's no way to answer this. You will simply have to test.
