On Tue, Jan 12, 2021 at 01:46:53PM -0500, Bruce Momjian wrote:
> On Tue, Jan 12, 2021 at 01:15:44PM -0500, Bruce Momjian wrote:
> > Well, we have eight unused bits in the IV, so we could just increment
> > that for every hint bit change that uses the same LSN, and then force a
> > dummy WAL record when that 8-bit counter overflows --- that seems
> > simpler than logging hint bits.
>
> Sorry, I was incorrect. The IV is 16 bytes, made up of the LSN (8
> bytes), and the page number (4 bytes). That leaves 4 bytes unused or
> 2^32 values for hint bit changes before we have to generate a dummy LSN
> record.
I just did a massive update to the Transparent Data Encryption wiki page
to make it more readable and updated it with current decisions:
https://wiki.postgresql.org/wiki/Transparent_Data_Encryption
--
Bruce Momjian <bruce@momjian.us> https://momjian.us
EnterpriseDB https://enterprisedb.com
The usefulness of a cup is in its emptiness, Bruce Lee