Hi and thank you! On 12.01.2013, at 11:52, Eduardo Morras <emorr...@yahoo.es> wrote:
>> With the last "AND b.value=..." the query is extremely slow (did not wait >> for it to end, but more than a minute), because the value column is not >> indexed (contains items longer than 8K). > > You can construct your own home made index, add a new column in table b, with > the first 8-16 bytes/chars of b.value, use this column on your query and > refine to a complete b.value. Don't forget tocCreate an index for it too. You > can keep this column updated with a trigger. Yes, I have been considering this in a slightly different way. value contains short and long values (mixed). Only the short values are queried directly. The long values are queried in a tsearch column or in an external Sphinx Search. So probably I should split the short and long values and then index the short values. It is nevertheless slightly annoying that I cannot make the query do the value thing last... > Perhaps you can use a partial index for b.value column, i never used that > feature so documentation/others can point you how to do it. Did not know of them, reading. Thank you! T. -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
