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Re: A couple of patches for PostgreSQL 64bit support - Mailing list pgsql-patches

From ITAGAKI Takahiro
Subject Re: A couple of patches for PostgreSQL 64bit support
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In response to Re: A couple of patches for PostgreSQL 64bit support  (Hans-Jürgen Schönig <[email protected]>)
Responses Re: A couple of p.tches for PostgreSQL 64bit support
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Hans-J|rgen Schvnig <[email protected]> wrote:

> 64-bit XIDs seem to be an overkill - the only practical impact I can see
> is an even larger tuple header (this can be an issue on large boxes too
> - at least compared to Oracle).

I agreed, too. The changes of XIDs cannot be ignored because the overhead
will be 32bytes per tuple.

Avoiding overheads, can XIDs/CIDs be different bit length? For example,
can XIDs/CIDs be changed to 48/16-bit or 40/24-bit?

---
ITAGAKI Takahiro
NTT Cyber Space Laboratories

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