>> 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".
Done. 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
