Re: 7.4.7: strange planner decision

Roman Neuhauser wrote:
> Why does the planner want to crawl the table that has 5M rows instead of the one
> with 176k rows? Both tables are freshly vacuum-full-analyzed.

Because you don't have an index on "base" for the files table.

> callrec32=# \d fix.files
> Table "fix.files"
> Column | Type | Modifiers
> --------+------------------------+-----------
> dir | character varying(255) |
> base | character varying(255) |
> Indexes:
> "base_storename_idx" btree (base, ((((dir)::text || '/'::text) || (base)::text)))
> "ff_storename_idx" btree (((((dir)::text || '/'::text) || (base)::text)))

A couple of indexes, but none simple on "base", so it can't be used for
the join.

--
Richard Huxton
Archonet Ltd