On Mon, Jul 16, 2012 at 4:16 PM, Mark Thornton <mthornton@xxxxxxxxxx> wrote: >> Actually, it should create a temporary index btree and merge[0] them. >> Only worth if there are really a lot of rows. >> >> [0] http://www.ccs.neu.edu/home/bradrui/index_files/parareorg.pdf > > I think 93 million would qualify as a lot of rows. However does any > available database (commercial or open source) use this optimisation. Databases, I honestly don't know. But I do know most document retrieval engines use a similar technique with inverted indexes. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
