Re: bloat indexes - opinion

On Tue, Feb 21, 2017 at 1:44 PM, Patrick B <patrickbakerbr(at)gmail(dot)com> wrote:

> Hi guys,
>
> 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?

Cheers,

Jeff