You can find in this video the 6 questions that are always asked in Datastage interviews.
Please find below links to detailed tutorials on the topics covered in this video:
Partitioning
https://www.youtube.com/watch?v=zAbVGorY1ts&t=64s
Join
https://www.youtube.com/watch?v=iZicsyrQw78&t=722s
Lookup
https://www.youtube.com/watch?v=XjGypferfZ4&t=1657s
Datastage Director
https://www.youtube.com/watch?v=iTDh-ntLWzI&t=103s
Performance tuning
https://www.youtube.com/watch?v=irKgR7HyphI&t=7s
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