J. R. Nield wrote:
> One other point:
>
> Page pre-image logging is fundamentally the same as what Jim Grey's
> book[1] would call "careful writes". I don't believe they should be in
> the XLOG, because we never need to keep the pre-images after we're sure
> the buffer has made it to the disk. Instead, we should have the buffer
> IO routines implement ping-pong writes of some kind if we want
> protection from partial writes.
Ping-pong writes to where? We have to fsync, and rather than fsync that
area and WAL, we just do WAL. Not sure about a win there.
-- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610)
853-3000+ If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill,
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