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Ensure default-only storage parameters for TOAST relations

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to be initialized with proper values. Affected parameters are
fillfactor, analyze_threshold, and analyze_scale_factor.

Especially uninitialized fillfactor caused inefficient page usage
because we built a StdRdOptions struct in which fillfactor is zero
if any reloption is set for the toast table.

In addition, we disallow toast.autovacuum_analyze_threshold and
toast.autovacuum_analyze_scale_factor because we didn't actually
support them; they are always ignored.

Report by Rumko on pgsql-bugs on 12 May 2010.
Analysis by Tom Lane and Alvaro Herrera. Patch by me.

Backpatch to 8.4.
This commit is contained in:
Itagaki Takahiro 2010-06-07 03:01:35 +00:00
parent 32c6702f4d
commit 634b1614a0
2 changed files with 18 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
doc/src/sgml/ref/create_table.sgml
View File

@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/create_table.sgml,v 1.114.2.2 2010/05/13 18:54:23 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/create_table.sgml,v 1.114.2.3 2010/06/07 03:01:34 itagaki Exp $
PostgreSQL documentation
-->
@ -770,7 +770,7 @@ and <replaceable class="PARAMETER">table_constraint</replaceable> is:
</varlistentry>
<varlistentry>
<term><literal>autovacuum_analyze_threshold</>, <literal>toast.autovacuum_analyze_threshold</literal> (<type>integer</>)</term>
<term><literal>autovacuum_analyze_threshold</> (<type>integer</>)</term>
<listitem>
<para>
Minimum number of inserted, updated, or deleted tuples before initiate an
@ -780,7 +780,7 @@ and <replaceable class="PARAMETER">table_constraint</replaceable> is:
</varlistentry>
<varlistentry>
<term><literal>autovacuum_analyze_scale_factor</>, <literal>toast.autovacuum_analyze_scale_factor</literal> (<type>float4</>)</term>
<term><literal>autovacuum_analyze_scale_factor</> (<type>float4</>)</term>
<listitem>
<para>
Multiplier for <structfield>reltuples</> to add to

19
src/backend/access/common/reloptions.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/common/reloptions.c,v 1.28.2.2 2010/03/11 21:47:25 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/common/reloptions.c,v 1.28.2.3 2010/06/07 03:01:35 itagaki Exp $
*
*-------------------------------------------------------------------------
*/
@ -114,7 +114,7 @@ static relopt_int intRelOpts[] =
{
"autovacuum_analyze_threshold",
"Minimum number of tuple inserts, updates or deletes prior to analyze",
RELOPT_KIND_HEAP | RELOPT_KIND_TOAST
RELOPT_KIND_HEAP
},
-1, 0, INT_MAX
},
@ -175,7 +175,7 @@ static relopt_real realRelOpts[] =
{
"autovacuum_analyze_scale_factor",
"Number of tuple inserts, updates or deletes prior to analyze as a fraction of reltuples",
RELOPT_KIND_HEAP | RELOPT_KIND_TOAST
RELOPT_KIND_HEAP
},
-1, 0.0, 100.0
},
@ -1122,10 +1122,21 @@ default_reloptions(Datum reloptions, bool validate, relopt_kind kind)
bytea *
heap_reloptions(char relkind, Datum reloptions, bool validate)
{
StdRdOptions *rdopts;
switch (relkind)
{
case RELKIND_TOASTVALUE:
return default_reloptions(reloptions, validate, RELOPT_KIND_TOAST);
rdopts = (StdRdOptions *)
default_reloptions(reloptions, validate, RELOPT_KIND_TOAST);
if (rdopts != NULL)
{
/* adjust default-only parameters for TOAST relations */
rdopts->fillfactor = 100;
rdopts->autovacuum.analyze_threshold = -1;
rdopts->autovacuum.analyze_scale_factor = -1;
}
return (bytea *) rdopts;
case RELKIND_RELATION:
return default_reloptions(reloptions, validate, RELOPT_KIND_HEAP);
default: