Re: WHERE with ORDER not using the best index

Thank you so much for the prompt reply, Tom. The index is actually fairly new
- but to be safe I issued REINDEX TABLE so that they are all clean. Here are
the sizes of each index right after REINDEX.

db=> select
pg_size_pretty(pg_relation_size('index_social_feed_feed_items_on_social_feed_id_and_posted_at'));
 pg_size_pretty
----------------
 149 MB
(1 row)

db=> select
pg_size_pretty(pg_relation_size('index_social_feed_feed_items_on_social_feed_id'));
 pg_size_pretty
----------------
 106 MB
(1 row)

Unfortunately, pg still thinks using
index_social_feed_feed_items_on_social_feed_id is faster although they are
about the same size :(. Any idea?

Regards,
Ken



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