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From Nantia Makrynioti <nantiam...@gmail.com>
Subject Re: Memory estimates equal to zero
Date Tue, 05 Sep 2017 07:21:54 GMT
Hello Matthias and Janardhan,

thank you very much for your replies.

The dataset I tried is indeed quite small. It is a csv of 506 rows * 14
columns (49.1 kb).

I'll try with a bigger one and check the memory estimates again.

Thanks again,
Nantia

2017-09-05 0:05 GMT+03:00 Matthias Boehm <mboehm7@googlemail.com>:

> Hi Nantia,
>
> that's a good question - if your input data is very small, there is nothing
> to worry about. For the explain output, the memory estimates are rounded to
> MB. Therefore, whenever your input is less than 65,536 cells (dense), you
> will see a memory estimate of 0 MB (e.g., round(65,535*8/(1,024*1,024)) =
> 0).
>
> Regards,
> Matthias
>
> On Mon, Sep 4, 2017 at 2:24 AM, Nantia Makrynioti <nantiamakr@gmail.com>
> wrote:
>
> > Hello,
> >
> > I generated a HOP plan and memory estimates for the input data of HOP
> > operators are all 0MB. The code runs locally and the execution type is
> CP.
> > What could be the case where memory is estimated to 0MB?
> >
> > Thank you very much,
> > Nantia
> >
>

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