Can MonetDB be slowed down by a single query?

Martin Kersten martin.kersten at cwi.nl
Thu Apr 14 08:45:34 CEST 2016


On 14/04/16 08:30, Vijay Krishna wrote:
> Hi,
>
> As per MonetDB's architecture, the memory allocated to a single query (thread) is left with the OS and is not controlled by the mserver.
>
> If so, I am wondering how MonetDB would react to the following scenario.
>
> I receive a client connection with a single costly query whose execution would require all of the RAM's memory.
Hi

Both queries will run concurrently and fight for the total memory.
However, after some time, the oldest query is put on lower priority

>
> Now, when I receive a second connection that runs a similar costly operation, will MonetDB start processing this second query by using the available meagre memory (RAM leftovers or from disk swap) or will MonetDB wait till the first query releases some of
> its memory?
>
>
>
> Thanks & Regards,
>
> Vijayakrishna.P.
> Mobile : (+91) 9500402305.
>
>
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