On Monday 12 May 2014 10:10:36 David G Johnston wrote: > Did you try rewriting the query to avoid using an IN expression? > > UPDATE foo SET processing = 't' > FROM ( > SELECT id FROM foo WHERE processing = 'f' ORDER BY id ASC LIMIT 5000 FOR > UPDATE > ) src > WHERE foo.id = src.id; > > The workaround I mentioned above said that a CTE was needed but I'm thinking > that a simply FROM would be just as effective. Otherwise: > > UPDATE foo SET processing = 't' > FROM ( > WITH ids_to_update AS ( > SELECT id FROM foo WHERE processing = 'f' ORDER BY id ASC LIMIT 5000 FOR > UPDATE > ) > SELECT id FROM ids_to_update > ) src > WHERE foo.id = src.id; As it happens, I've done a fair bit of refactoring in my code (but not the actual query), and now I cannot reproduce the bug anymore :/ The refactoring had to do with taking status queries to a different connection, and changing the timing of calling the problematic query and interruption by other threads, to increase throughput. -- Vincent de Phily
