Thanks Aryeh. Aryeh Gregor wrote: > On Fri, Mar 20, 2009 at 1:08 PM, O. O. <olson...@yahoo.com> wrote: >> I cannot understand why there are more redirects in the redirect table >> than there are in the pages in the Page table with the redirect flag set. >> >> select count(*) from wikidb.redirect ; --- Gives 3422938 >> >> while >> >> select count(*) from wikidb.page where page_is_redirect=1; --- Gives >> 3242340 >> >> Why should there be this difference? Are there redirects that are not >> listed in the Page Table? > > It's denormalized data, so I'd assume that those are just errors of > some kind. If you need to be really really sure whether something is > a redirect, you have to parse its text (it's just a regex, should be > somewhere in includes/Article.php or something). That's the > authoritative check, which IIRC is used when actually deciding whether > to redirect. >
As, SELECT count(*) FROM wikidb.page JOIN wikidb.redirect ON rd_from=page_id; --- Gives 3210708 Which is less than the total rows in the Redirect Table i.e. select count(*) from wikidb.redirect ; --- Gives 3422938 which is more than 3210708 I think this might mean that there are entries in the Redirect Table where the rd_from does not correspond to a valid page_id in the Page Table? I don’t know what these would be used for though. Thanks again, O. O. _______________________________________________ Wikitech-l mailing list Wikitech-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikitech-l
