Take a look at this document
if you want to know how Qlik read and store data
QVW is the Qlik doc; contains everything a user will need to perform analysis; when you save a QVW you're storing on file system the document db (in memory db, all tables you can see with ctrl+t), the load script, the user interface (charts), security
if you don't want to store the tables, drop the tables at the end of the script
1 QVW = 1 file = many tables
QVD is a file in a Qlik proprietary format (usually used for performance reason)
1 QVD = 1 table
to make a QVD use store statement (from memory to file system) in QVW script
to read a QVD in a QVW, use a load statement (from file system to in memory db)
if you want to reuse a Qlik table in differerent QVW, you can store it as QVD on file system
You can visualize storage in a QlikView document as a two level organization:
1) Store distinct list of values
2) Data consisting of pointers
Qlikview creates one symbol table per field. In other words there is exactly one list for each field included in the document. If you have 25 fields in the document you will have 25 lists.Each row in a symbol table contains a pointer and the value of the field.
The table contains the pointers only. Pointers can be used to look up the real value in the symbol table, no information has been lost.