Comments (1)
Play with secondary idexes - are they more efficient than a carefully-considered sorting key?
No, they ~only make sense if you have some data locality for column used in skip index, (so there is some correlation between that column and table ORDER BY key) Some examples https://kb.altinity.com/altinity-kb-queries-and-syntax/skip-indexes/
Sequence Num for sampling, but how? It's as high-cardinality as it gets.
Sampling only make sense if you have good distribution of data across whole number range (min-max)
https://kb.altinity.com/altinity-kb-queries-and-syntax/altinity-kb-sample-by/
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