Magic ETL
Magic ETL
Performance of UNION in RedShift
Has anyone used UNION successfully with RedShift in DOMO? I have a DF that seems to stall on the query using the UNION. I don't know if it would error out b/c I'm too impatient (after waiting 30 m), but I ended up revising how I wrote the script to not need the UNION...but was curious why it would have been delayed SOOOO long...300k rows unioning on 300 rows....
Thanks and have a great day.
Best Answer
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If you're not worried about removing duplicates, then UNION ALLshould skip the DISTINCT step of the UNION operation and improve your performance a bit.
2
Answers
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If you're not worried about removing duplicates, then UNION ALLshould skip the DISTINCT step of the UNION operation and improve your performance a bit.
2 -
I just introduced my palm to my head after I read that. I did leave off ALL. Crap. Thanks for chiming in and helping me out. Good catch! I should have used UNION ALL but left it out.
1
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