When using --in-memory, no files are written, so everything is in memory. So you are limited to the amount of memory your system has (including swap space), but the kernel determines how much of that you can use. No files are memory-mapped (anonymous mmap is used, mostly by malloc, but that doesn't use a file). On 09/04/2021 09.21, Lakshmipathy Jois wrote:

Hi All,

I am new to MonetDB and this is my first email to this group.

I came across the option --in-memory for mserver5. I understood that if this option is set, then MonetDB operates out of memory and data is not persisted.

I wanted to know more details about the working of MonetDB if this option is set:

1. If this option is set, what is the maximum data size that MonetDB can operate with? 2. If this option is set, will MonetDB use mmap only for reading purposes or not use mmap at all?

Any other information is really welcome.

Thanks in advance. Lakshmi Pathy S N

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