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. regards, tom lane -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers