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pgstattuple: Add pgstathashindex.

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Since pgstattuple v1.5 hasn't been released yet, no need for a new
extension version.  The new function exposes statistics about hash
indexes similar to what other pgstatindex functions return for other
index types.

Ashutosh Sharma, reviewed by Kuntal Ghosh.  Substantial further
revisions by me.
This commit is contained in:
Robert Haas
2017-02-03 14:35:25 -05:00
parent 39b8cc991f
commit e759854a09
5 changed files with 318 additions and 0 deletions
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95
doc/src/sgml/pgstattuple.sgml
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@ -352,6 +352,101 @@ pending_tuples | 0
</listitem>
</varlistentry>
<varlistentry>
<term>
<indexterm>
<primary>pgstathashindex</primary>
</indexterm>
<function>pgstathashindex(regclass) returns record</>
</term>
<listitem>
<para>
<function>pgstathashindex</function> returns a record showing information
about a HASH index. For example:
<programlisting>
test=&gt; select * from pgstathashindex('con_hash_index');
-[ RECORD 1 ]--+-----------------
version | 2
bucket_pages | 33081
overflow_pages | 0
bitmap_pages | 1
zero_pages | 32455
live_items | 10204006
dead_items | 0
free_percent | 61.8005949100872
</programlisting>
</para>
<para>
The output columns are:
<informaltable>
<tgroup cols="3">
<thead>
<row>
<entry>Column</entry>
<entry>Type</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry><structfield>version</structfield></entry>
<entry><type>integer</type></entry>
<entry>HASH version number</entry>
</row>
<row>
<entry><structfield>bucket_pages</structfield></entry>
<entry><type>bigint</type></entry>
<entry>Number of bucket pages</entry>
</row>
<row>
<entry><structfield>overflow_pages</structfield></entry>
<entry><type>bigint</type></entry>
<entry>Number of overflow pages</entry>
</row>
<row>
<entry><structfield>bitmap_pages</structfield></entry>
<entry><type>bigint</type></entry>
<entry>Number of bitmap pages</entry>
</row>
<row>
<entry><structfield>zero_pages</structfield></entry>
<entry><type>bigint</type></entry>
<entry>Number of new or zero pages</entry>
</row>
<row>
<entry><structfield>live_items</structfield></entry>
<entry><type>bigint</type></entry>
<entry>Number of live tuples</entry>
</row>
<row>
<entry><structfield>dead_tuples</structfield></entry>
<entry><type>bigint</type></entry>
<entry>Number of dead tuples</entry>
</row>
<row>
<entry><structfield>free_percent</structfield></entry>
<entry><type>float</type></entry>
<entry>Percentage of free space</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<indexterm>