Matt Jones wrote: > On Mar 11, 4:50�am, John Smith <li...@ruby-forum.com> wrote: >> I have a simple table inherance, with an upper class GeneralElement. A >> class that inherits is Activity: >> class Activity < GeneralElement >> ... >> end >> >> The GeneralElement table is very big (about 2.000.000 rows!). Other >> classes that inherit from GeneralElement return queries very fast, but >> Activity.last is very slow. I have added indexes to id and type, but it >> has no effect. What can I do? > > You may want to grab the query that Activity.last is using, and try > running it through 'EXPLAIN' to see what it's looking for. Have you > defined an order (via default_scope, for instance) on Activity? You > might need to have an index on that field together with 'type' to get > right behavior. > > --Matt Jones
I have added an index to the type column; but maybe it's possible to add a special index to both the id and type column at the same time. How could I do this? -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-t...@googlegroups.com. To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
