Re: "supplementary storage table"?

On Thu, May 13, 2010 at 11:08 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Okay, who decided $SUBJECT was a good locution for "toast table"?
> I find two or three usages of that in the CREATE/ALTER TABLE reference
> pages, without definition.  Everywhere else it's "toast table".
> We do not need people deciding to invent their own terminology for
> the docs.

Well, according to git, the first mention of it was here:

commit 43bb6b91b229ad859358c7365c941f55a74ae7e9
Author: Bruce Momjian <bruce(at)momjian(dot)us>
Date: Tue Mar 5 05:33:31 2002 +0000

I attach a version of my toast-slicing patch, against current CVS
(current as of a few hours ago.)

This patch:

1. Adds PG_GETARG_xxx_P_SLICE() macros and associated support routines.

2. Adds routines in src/backend/access/tuptoaster.c for fetching only
necessary chunks of a toasted value. (Modelled on latest changes to
assume chunks are returned in order).

3. Amends text_substr and bytea_substr to use new methods. It now
handles multibyte cases -and should still lead to a performance
improvement in the multibyte case where the substring is near the
beginning of the string.

4. Added new command: ALTER TABLE tabname ALTER COLUMN colname SET
STORAGE {PLAIN | EXTERNAL | EXTENDED | MAIN} to parser and documented in
alter-table.sgml. (NB I used ColId as the item type for the storage
mode string, rather than a new production - I hope this makes sense!).
All this does is sets attstorage for the specified column.

4. AlterTableAlterColumnStatistics is now AlterTableAlterColumnFlags and
handles both statistics and storage (it uses the subtype code to
distinguish). The previous version of my patch also re-arranged other
code in backend/commands/command.c but I have dropped that from this
patch.(I plan to return to it separately).

5. Documented new macros (and also the PG_GETARG_xxx_P_COPY macros) in
xfunc.sgml. ref/alter_table.sgml also contains documentation for ALTER
COLUMN SET STORAGE.

John Gray

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