Hi, It is true, H2 doesn't use two indexes for the single query (the one without union), as described in the documentation at http://h2database.com/html/performance.html#storage_and_indexes
I just tested that Apache Derby doesn't use two indexes either (the same as H2). I didn't test, but I guess other databases with a more advanced optimizer (such as PostgreSQL) do use two indexes for this case. But I'm not sure. I guess some databases can use two indexes, and some can not. Regards, Thomas -- You received this message because you are subscribed to the Google Groups "H2 Database" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/h2-database?hl=en.
