> Tatsuo Ishii <is...@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 -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
