amazon web services - Disk usage when redshift doing vacuum merge? -

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i know redshift split vacuum progress 2 stages: sort , merge.

during sorting, disk usage not change, merge stage seems occupy lot of free space.

my cluster 3 nodes of dw2.xlarge, total 480 gb ssd. before vacuuming, total disk usage around 50%.

i'm doing vacuum on a table of 81gb, failed when trying merge, due disk full error.

i want know how space should reserve vacuuming large unsorted table?

i asked question redshift support team, haven't got reply until now. have experience it?

yes longer vacuum use deep copy

this should avoid disk usage problems.

while insert ( select * from...) here in select select sorted order data data inserted in sorted fashion.

do incremental insert (select * ) per sort key e.g if storing data 30 days deep copy day day should avoid space issues


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