I am looking to squeeze a bit more speed out of my database by clustering most of my tables. However, on tables with multiple indexes, how is the best way to choose the index. I am thinking I want to use the index with the largest pg_stat_user_indexes.idx_tup_read. Would this be correct? If not, what column(s) and views should I be looking at to find the most popular index?
Secondly, I have some partial indexes on a very active table, and it tends to have the highest idx_tup_read for that table. Is is possible to cluster on a partial index?