Tuesday, September 30, 2008

Re: [HACKERS] Block-level CRC checks

Alvaro Herrera <alvherre@commandprompt.com> writes:
> The implementation I'm envisioning requires the use of a new relation
> fork to store the per-block CRCs.

That seems bizarre, and expensive, and if you lose one block of the CRC
fork you lose confidence in a LOT of data. Why not keep the CRCs in the
page headers?

> A buffer's io_in_progress lock protects the buffer's CRC.

Unfortunately, it doesn't. See hint bits.

regards, tom lane

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