Normal queries running slower than Redshift Spectrum queries

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I am using Redshift Spectrum for some queries & I have some queries running without Spectrum. I notice that some queries accessing data in my cluster are running slower than my Redshift Spectrum queries. Why is that?

Oct 10, 2018 in AWS by datageek
• 2,440 points
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1 answer to this question.

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Amazon Redshift queries are run on your cluster resources against local disk. Redshift Spectrum queries run using per-query scale-out resources against data in S3. For most queries, local disk will be faster, but for queries that scan a lot of data and do minimal compute processing, we can apply a lot of Redshift Spectrum workers and complete them quickly.

Hope this helped.

answered Oct 10, 2018 by Archana
• 4,090 points

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