> Right now the WAL preallocation code (XLogFileInit) is not good enough
> because it does lseek to the 16MB position and then writes 1 byte there.
> On an implementation that supports holes in files (which is most Unixen)
> that doesn't cause physical allocation of the intervening space. We'd
> have to actually write zeroes into all 16MB to ensure the space is
> allocated ... but that's just a couple more lines of code.
Are OS's smart enough to not allocate zero-written blocks? Do we need
to write non-zeros?
-- 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,
Pennsylvania19026
