AW: [HACKERS] CRCs

2001-01-15 Thread Zeugswetter Andreas SB
> Instead of a partial row CRC, we could just as well use some other bit > of identifying information, say the row OID. Given a block CRC on the > heap page, we'll be pretty confident already that the heap page is OK, > we just need to guard against the possibility that it's older than the > ind

AW: [HACKERS] CRCs (was Re: [GENERAL] Re: Loading optimization)

2001-01-12 Thread Zeugswetter Andreas SB
> A disk-block CRC would detect partially written blocks (ie, power drops > after disk has written M of the N sectors in a block). The disk's own > checks will NOT consider this condition a failure. But physical log recovery will rewrite every page that was changed after last checkpoint, thus t