<row>
<entry>columns per table</entry>
- <entry>1600</entry>
+ <entry>1,600</entry>
<entry>further limited by tuple size fitting on a single page; see note
below</entry>
</row>
<row>
<entry>columns in a result set</entry>
- <entry>1664</entry>
+ <entry>1,664</entry>
<entry></entry>
</row>
<entry></entry>
</row>
- <row>
- <entry>identifier length</entry>
- <entry>63 bytes</entry>
- <entry>can be increased by recompiling <productname>PostgreSQL</productname></entry>
- </row>
-
<row>
<entry>indexes per table</entry>
<entry>unlimited</entry>
<entry>can be increased by recompiling <productname>PostgreSQL</productname></entry>
</row>
- <row>
- <entry>partition keys</entry>
- <entry>32</entry>
- <entry>can be increased by recompiling <productname>PostgreSQL</productname></entry>
- </row>
+ <row>
+ <entry>partition keys</entry>
+ <entry>32</entry>
+ <entry>can be increased by recompiling <productname>PostgreSQL</productname></entry>
+ </row>
+
+ <row>
+ <entry>identifier length</entry>
+ <entry>63 bytes</entry>
+ <entry>can be increased by recompiling <productname>PostgreSQL</productname></entry>
+ </row>
+
+ <row>
+ <entry>function arguments</entry>
+ <entry>100</entry>
+ <entry>can be increased by recompiling <productname>PostgreSQL</productname></entry>
+ </row>
+
+ <row>
+ <entry>query parameters</entry>
+ <entry>65,535</entry>
+ <entry></entry>
+ </row>
</tbody>
</tgroup>
</table>
<para>
The maximum number of columns for a table is further reduced as the tuple
being stored must fit in a single 8192-byte heap page. For example,
- excluding the tuple header, a tuple made up of 1600 <type>int</type> columns
+ excluding the tuple header, a tuple made up of 1,600 <type>int</type> columns
would consume 6400 bytes and could be stored in a heap page, but a tuple of
- 1600 <type>bigint</type> columns would consume 12800 bytes and would
+ 1,600 <type>bigint</type> columns would consume 12800 bytes and would
therefore not fit inside a heap page.
Variable-length fields of
types such as <type>text</type>, <type>varchar</type>, and <type>char</type>