Re: planstats.sgml

> Tatsuo Ishii <ishii@postgresql.org> writes:
>> While reading planstats.sgml, I encounted a sentence which I don't
>> understand.
> 
>>     These numbers are current as of the last <command>VACUUM</> or
>>     <command>ANALYZE</> on the table.  The planner then fetches the
>>     actual current number of pages in the table (this is a cheap operation,
>>     not requiring a table scan).  If that is different from
>>     <structfield>relpages</structfield> then
>>     <structfield>reltuples</structfield> is scaled accordingly to
>>     arrive at a current number-of-rows estimate.  In this case the value of
>>     <structfield>relpages</structfield> is up-to-date so the rows estimate is
>>     the same as <structfield>reltuples</structfield>.
> 
>> I don't understand the last sentence (In this case...). For me it
>> seems it is talking about the case when replages is not different from
>> what the planner fetches from the table. If so, why "In this case"?
> 
> I think what it meant is "In the example above, ...".  Feel free to
> change it if you think that is clearer.

Oh, I see. I'm going to change "In this case" to "In the example above".

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp