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Arrange to put TOAST tables belonging to temporary tables into special schemas

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named pg_toast_temp_nnn, alongside the pg_temp_nnn schemas used for the temp
tables themselves.  This allows low-level code such as the relcache to
recognize that these tables are indeed temporary, which enables various
optimizations such as not WAL-logging changes and using local rather than
shared buffers for access.  Aside from obvious performance benefits, this
provides a solution to bug #3483, in which other backends unexpectedly held
open file references to temporary tables.  The scheme preserves the property
that TOAST tables are not in any schema that's normally in the search path,
so they don't conflict with user table names.

initdb forced because of changes in system view definitions.
This commit is contained in:
Tom Lane
2007-07-25 22:16:18 +00:00
parent fdb5b69e9c
commit 82eed4dba2
11 changed files with 148 additions and 56 deletions
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9
src/bin/psql/describe.c
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@ -3,7 +3,7 @@
*
* Copyright (c) 2000-2007, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/bin/psql/describe.c,v 1.156 2007/06/28 06:40:16 neilc Exp $
* $PostgreSQL: pgsql/src/bin/psql/describe.c,v 1.157 2007/07/25 22:16:18 tgl Exp $
*/
#include "postgres_fe.h"
#include "describe.h"
@ -1688,9 +1688,12 @@ listTables(const char *tabtypes, const char *pattern, bool verbose)
* pg_catalog and pg_toast. (We don't want to hide temp tables though.)
*/
if (showSystem)
appendPQExpBuffer(&buf, " AND n.nspname = 'pg_catalog'\n");
appendPQExpBuffer(&buf,
" AND n.nspname = 'pg_catalog'\n");
else
appendPQExpBuffer(&buf, " AND n.nspname NOT IN ('pg_catalog', 'pg_toast')\n");
appendPQExpBuffer(&buf,
" AND n.nspname <> 'pg_catalog'\n"
" AND n.nspname !~ '^pg_toast'\n");
processSQLNamePattern(pset.db, &buf, pattern, true, false,
"n.nspname", "c.relname", NULL,