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Get rid of pg_class.reltoastidxid.

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Treat TOAST index just the same as normal one and get the OID
of TOAST index from pg_index but not pg_class.reltoastidxid.
This change allows us to handle multiple TOAST indexes, and
which is required infrastructure for upcoming
REINDEX CONCURRENTLY feature.

Patch by Michael Paquier, reviewed by Andres Freund and me.
This commit is contained in:
Fujii Masao
2013-07-04 03:24:09 +09:00
parent f71939cd1a
commit 2ef085d0e6
21 changed files with 333 additions and 163 deletions
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9
doc/src/sgml/catalogs.sgml
View File

@ -1744,15 +1744,6 @@
</entry>
</row>
<row>
<entry><structfield>reltoastidxid</structfield></entry>
<entry><type>oid</type></entry>
<entry><literal><link linkend="catalog-pg-class"><structname>pg_class</structname></link>.oid</literal></entry>
<entry>
For a TOAST table, the OID of its index. 0 if not a TOAST table.
</entry>
</row>
<row>
<entry><structfield>relhasindex</structfield></entry>
<entry><type>bool</type></entry>

26
doc/src/sgml/diskusage.sgml
View File

@ -20,12 +20,12 @@
stored. If the table has any columns with potentially-wide values,
there also might be a <acronym>TOAST</> file associated with the table,
which is used to store values too wide to fit comfortably in the main
table (see <xref linkend="storage-toast">). There will be one index on the
<acronym>TOAST</> table, if present. There also might be indexes associated
with the base table. Each table and index is stored in a separate disk
file &mdash; possibly more than one file, if the file would exceed one
gigabyte. Naming conventions for these files are described in <xref
linkend="storage-file-layout">.
table (see <xref linkend="storage-toast">). There will be one valid index
on the <acronym>TOAST</> table, if present. There also might be indexes
associated with the base table. Each table and index is stored in a
separate disk file &mdash; possibly more than one file, if the file would
exceed one gigabyte. Naming conventions for these files are described
in <xref linkend="storage-file-layout">.
</para>
<para>
@ -44,7 +44,7 @@
<programlisting>
SELECT pg_relation_filepath(oid), relpages FROM pg_class WHERE relname = 'customer';
pg_relation_filepath | relpages
pg_relation_filepath | relpages
----------------------+----------
base/16384/16806 | 60
(1 row)
@ -65,12 +65,12 @@ FROM pg_class,
FROM pg_class
WHERE relname = 'customer') AS ss
WHERE oid = ss.reltoastrelid OR
oid = (SELECT reltoastidxid
FROM pg_class
WHERE oid = ss.reltoastrelid)
oid = (SELECT indexrelid
FROM pg_index
WHERE indrelid = ss.reltoastrelid)
ORDER BY relname;
relname | relpages
relname | relpages
----------------------+----------
pg_toast_16806 | 0
pg_toast_16806_index | 1
@ -87,7 +87,7 @@ WHERE c.relname = 'customer' AND
c2.oid = i.indexrelid
ORDER BY c2.relname;
relname | relpages
relname | relpages
----------------------+----------
customer_id_indexdex | 26
</programlisting>
@ -101,7 +101,7 @@ SELECT relname, relpages
FROM pg_class
ORDER BY relpages DESC;
relname | relpages
relname | relpages
----------------------+----------
bigtable | 3290
customer | 3144

4
doc/src/sgml/monitoring.sgml
View File

@ -1163,12 +1163,12 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
<row>
<entry><structfield>tidx_blks_read</></entry>
<entry><type>bigint</></entry>
<entry>Number of disk blocks read from this table's TOAST table index (if any)</entry>
<entry>Number of disk blocks read from this table's TOAST table indexes (if any)</entry>
</row>
<row>
<entry><structfield>tidx_blks_hit</></entry>
<entry><type>bigint</></entry>
<entry>Number of buffer hits in this table's TOAST table index (if any)</entry>
<entry>Number of buffer hits in this table's TOAST table indexes (if any)</entry>
</row>
</tbody>
</tgroup>