Re: Questions on extending a relation

"Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes
>
> Yes. That's intentional --- otherwise they'd all block each other.
>

So if I saw the last two pages on a disk relation are half full, that's
nothing wrong?

>
> Why wouldn't we replay xlog? Note in particular that the bgwriter is
> not allowed to push page B to disk until the xlog entry describing the
> index change has been flushed to disk. Since that will come after the
> xlog entry about the heap change, both changes are necessarily on-disk
> in the xlog, and both will be remade during replay.
>

Yes, I made a mistake. We reply xlog in any ways (no matter the transaction
commits or not).

Thanks,
Qingqing