Zdenek Kotala <[EMAIL PROTECTED]> writes:
> Koichi Suzuki wrote:
>> I've once proposed a patch for 64bit transaction ID, but this causes
>> some overhead to each tuple (XMIN and XMAX).
> Did you check performance on 32-bit or 64-bit systems and 64-bit binary
> version of PGSQL? I think that today is not problem to have 64-bit
> architecture and 64-bit ID should increase scalability of Postgres.
The percentage increase in I/O demand is the main reason the patch was
rejected, not so much the arithmetic.
regards, tom lane
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