I've got a lot of bloat indexes on my 4TB database.
Let's take this example:
Table: seg
Index: ix_filter_by_tree
Times_used: 1018082183
Table_size: 18 GB -- wrong. The table is mostly on pg_toast table. Its real size is 2TB
Index_size: 17 GB
Num_writes 16245023
Index definition: CREATE INDEX ix_filter_by_tree ON seg USING btree (full_path varchar_pattern_ops) WHERE (full_path IS NOT NULL)
What is this from? If you think the table size reported should include toast, then change it to do that, or request the author of whatever-this-is to make that change.
What indication is there that the index is bloated? If the meat-and-potatoes of a table is held in toast, then wouldn't you expect the size of the table and the size of the index to be about the same?
