The document provides tips for improving the performance of loading and joining data in Qlik Sense, including loading from compressed QVD files which is 10-100 times faster than other file types, reducing unnecessary joins and synthetic keys by concatenating or linking tables with common fields, and optimizing scripts by separating them into tabs and using partial loads or inline tables when possible. Proper data modeling techniques like applying mapping tables instead of joins can also improve load times.

1. 1. Load Statement:
Load from Files,xls,csv,qvd,SAP,cloud & other.
Load from Db using connect ODBC.
Load using SQL Query directly.
2. 10-100 times faster to read files from QVDs as
these are compressed data files.
3. Association (Relationship between tables)
more than 1 associated field synthetic keys are
generated.

2. 4. During load of multiple tables 2 or more tables
get associated based on multiple field names
(columns) generating synthetic keys and synthetic
tables. They are resource intensive hence must be
removed.
5. Loops
3 or more tables making circular reference.
Loosely couple tables or aliases remove loops.

3. 6.Reduce no. of tables and join in data model.
Use mapping tables and ApplyMap().
7. Inline tables
create small ref tables, create inline tables.
8. Joins : left keep like left outer join.
9. Scripts: separate scripts for each tables into tabs
10. Create master calender when no continous dates
in fact table.

4. 11. Concatenated tables: tables with similar field
names can be concatenated help resolve synthetic
keys.
12. Link Table: link 2 fact tables contain common
keys from both eliminate need for multiple key join
of synthetic keys.
13. Partial Load: load a subset of tables. ADD will
apend records and REPLACE drop and create table

5. 14. Cross Table: prefix CrossTable to load statement.
performing aggregation is difficult.
15. Section access: provide data level security
restricting what users can see. Acess defined by
hidden script. Acess control data managed through
text files,db and inline tables.
16. Binary load: used to load script part of another
qvw file.
17.Interval match start end interval data to single
discrete value.also for slowly changing dimension.