From: | Hannu Krosing <hannu(at)skype(dot)net> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, pgsql-hackers(at)postgresql(dot)org, pgsql-patches(at)postgresql(dot)org, Bruce Momjian <bruce(at)momjian(dot)us> |
Subject: | Re: Forcing current WAL file to be archived |
Date: | 2006-08-12 21:59:37 |
Message-ID: | 1155419978.5899.42.camel@localhost.localdomain |
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Lists: | pgsql-hackers pgsql-patches |
Ühel kenal päeval, L, 2006-08-12 kell 10:59, kirjutas Tom Lane:
> Hannu Krosing <hannu(at)skype(dot)net> writes:
> > Ühel kenal päeval, K, 2006-08-09 kell 10:57, kirjutas Tom Lane:
> >> Insert points to the next byte to be written within the internal WAL
> >> buffers. The byte(s) preceding it haven't necessarily gotten out of
> >> those buffers yet. Write points to the end of what we've actually
> >> written to the kernel,
>
> > I assume that it also points to the byte after what is written to
> > kernel, or is it tha last byte written ?
>
> Right, it's really first-unwritten-byte for all three pointers.
> The two newly added functions to convert WAL locations to filenames
> use XLByteToPrevSeg(), so they should do the right thing here
> (see comments in src/include/access/xlog_internal.h).
How do they behave exactly at the file boundary ?
That is will it point 1 byte past end of old file, or byte 0 of the new
one ?
> regards, tom lane
--
----------------
Hannu Krosing
Database Architect
Skype Technologies OÜ
Akadeemia tee 21 F, Tallinn, 12618, Estonia
Skype me: callto:hkrosing
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