I want to know the pattern in which the columns are stored in each file. I mean the arrangement of data in a column in that file.
How  monetdb determines offset to select a particular row, header and footer format and other details like that.


On Mon, Mar 20, 2017 at 5:59 PM, Eyal Rozenberg <E.Rozenberg@cwi.nl> wrote:

The layout is actually rather involved, especially if you want to know about how the structure changes/files get created or moved during the course of a run of the mserver5 process; or how SQL columns relate to BAT columns; etc.

Also - the file layout changes with newer versions of MonetDB, and specifically, there was a significant change with version 11.25 (Dec 2016) - BATs are now always headless, so the format does not support storing actual heads.

In light of the above - can you try to describe your interests slightly more specifically?

Eyal



On 03/20/2017 12:58 PM, Senthil Vidhiyakar wrote:
I want to know the file layout of columnar data storage in MonetDB. I
know each column is stored in separate files. Actually I want to know
the exact layout as in a block diagram to get a clear picture of the
storage layout. Helps are appreciated.


Regards,
Senthil Vidhiyakar. S


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