Thread: How to get fully qualified names with EXPLAIN

Hello


2013/6/27 Bartosz Dmytrak <bdmytrak@gmail.com>:
> Hi All
> Let's assume I've got 3 tables:
>
> "OrgStructure"."tblUnits",
> "OrgStructure"."tblUnitStructure",
> "Dictionary"."tblUnits"
>
> I would like to do the EXPLAIN:
> EXPLAIN
> SELECT * FROM "OrgStructure"."tblUnits", "OrgStructure"."tblUnitStructure",
> "Dictionary"."tblUnits"
> (Of course its cartesian product - doesn't matter)
>
> I've got result:
> Nested Loop  (cost=0.00..971583.90 rows=77571000 width=482)
>   ->  Nested Loop  (cost=0.00..1930.03 rows=152100 width=354)
>         ->  Seq Scan on "tblUnits"  (cost=0.00..13.90 rows=390 width=177)
>         ->  Materialize  (cost=0.00..15.85 rows=390 width=177)
>               ->  Seq Scan on "tblUnits"  (cost=0.00..13.90 rows=390
> width=177)
>   ->  Materialize  (cost=0.00..17.65 rows=510 width=128)
>         ->  Seq Scan on "tblUnitStructure"  (cost=0.00..15.10 rows=510
> width=128)
>
> My question is:
> Which tblUnits is which one?
> There are no fully qualified names in EXPLAIN output, so it looks impossible
> to determine information for particular table.
>
> Is there any workaround, maybe I miss something?
> any ideas, clues?

pls, try EXPLAIN VERBOSE

postgres=# explain select * from xx.omega;
                       QUERY PLAN
─────────────────────────────────────────────────────────
 Seq Scan on omega  (cost=0.00..34.00 rows=2400 width=4)
(1 row)

postgres=# explain verbose select * from xx.omega;
                         QUERY PLAN
────────────────────────────────────────────────────────────
 Seq Scan on xx.omega  (cost=0.00..34.00 rows=2400 width=4)
   Output: a
(2 rows)

Regards

Pavel Stehule

>
>
> regards,
> Bartek