Re: planstats.sgml

>> Tatsuo Ishii <ishii(at)postgresql(dot)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".

Done.

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