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 calendar when no continuous
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
append 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. Access defined by
hidden script. Access 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.