Thread: Where in the source code does postgres write to disk?

Hi,

2013/04/21 0:01, Mike Levine wrote:
> According
> tohttp://www.postgresql.org/docs/9.2/static/storage-file-layout.html
>
> "When a table or index exceeds 1 GB, it is divided into gigabyte-sized
> segments. The first segment's file name is the same as the filenode;
> subsequent segments are named filenode.1, filenode.2, etc."
>
> I was wondering where in the source code this is dealt with. I have been
> searching for the last few hours but have had no luck
>
>
> Any help guiding me to the location in the source code where postgres
> writes the buffer to disk would be greatly appreciated.

See mdextend() in src/backend/storage/smgr/md.c.

That's the code which deals with segment files on extending a table,
and RELSEG_SIZE defines the segment size, 1GB by default.

Regards,
--
Satoshi Nagayasu <snaga@uptime.jp>
Uptime Technologies, LLC. http://www.uptime.jp