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Comments - create table ... select, insert into ... select not working

5 years ago Roman Nozdrin
Re: create table ... select, insert into ... select not working [Answer]

Greetings,

There are three operation modes for SELECTs in ColumnStore. One is the fastest, another we call it disabled vtable could be much slower. More information is here[1]. Complex SELECT queries used in INSERT..SELECT could be run in disabled vtable mode thus their execution time is unpredictable. There is a workaround this. You should use mcsmysql pipelining its output to cpimport. Something like this:

mcsmysql -e 'complex select query' | cpimport

CS will process the query in vtable mode then, not disabled vtable.

PS I would suggest to ask questions in the dedicated Google Group b/c you could get the answer faster.

1. https://mariadb.com/kb/en/library/columnstore-operating-mode/

 
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