Explain query
| От | Bartosz Dmytrak |
|---|---|
| Тема | Explain query |
| Дата | |
| Msg-id | CAD8_UcYk7rbH6qnCmn2+uTJON0UFXUd+5d-hLG_nWojN=06e=Q@mail.gmail.com обсуждение исходный текст |
| Ответы |
Re: Explain query
(Guillaume Lelarge <guillaume@lelarge.info>)
|
| Список | pgadmin-support |
Hi,
Regards,
Bartek
I faced strange problem (strange for me):
I have written code:
WITH t as (
INSERT INTO "tblD1" (id, "Data1")
VALUES ('a', 123)
RETURNING *)
UPDATE "tblBase"
SET "SomeData" = 123
WHERE id = 'a';
this code operates on simple tables:
CREATE TABLE "tblBase"(
id text NOT NULL,
"SomeData" integer,
CONSTRAINT "tblBase_pkey" PRIMARY KEY (id )
)
WITH (OIDS=FALSE);
and
CREATE TABLE "tblD1" (
id text NOT NULL,
"Data1" integer,
ser serial NOT NULL,
CONSTRAINT "tblD1_pkey" PRIMARY KEY (id ),
CONSTRAINT "tblD1_id_fkey" FOREIGN KEY (id)
REFERENCES "tblBase" (id) MATCH FULL
ON UPDATE CASCADE ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED
)
WITH (OIDS=FALSE);
in table "tblBase" two record exist:
id ; "SomeData"
'3';345
'a';1
i tried to use Explain query functionality and then I received a message:
Query result with 0 rows will be returned.
ERROR: cache lookup failed for attribute 3 of relation 38264
********** Error **********
ERROR: cache lookup failed for attribute 3 of relation 38264
SQL state: XX000
interesting thing is that execution of this code works as expected, also EXPLAIN and EXPLAIN ANALYZE gives proper response:
eg. EXPLAIN:
'Update on "tblBase" (cost=0.01..1.04 rows=1 width=38)'
' CTE t'
' -> Insert on "tblD1" (cost=0.00..0.01 rows=1 width=0)'
' -> Result (cost=0.00..0.01 rows=1 width=0)'
' -> Seq Scan on "tblBase" (cost=0.00..1.02 rows=1 width=38)'
' Filter: (id = 'a'::text)'
I am not sure this is pgAdmin issue, but I think it is good start point.
SELECT relname FROM pg_class WHERE oid = 38264;
gives "tblBase"
pg log lines look like this:
2012-04-18 22:44:25 CEST|myDatabase|postgres|pgAdmin III - Query Tool|myHost(59562)|6828LOG: statement: EXPLAIN (ANALYZE off, VERBOSE on, COSTS on, BUFFERS off )WITH t as (
INSERT INTO "tblDerived1" (id, "Data1")
VALUES ('a', 123)
RETURNING *)
UPDATE "tblBase"
SET "SomeData" = (SELECT ser FROM t)
WHERE id = (SELECT id FROM t)
2012-04-18 22:44:25 CEST|myDatabase|postgres|pgAdmin III - Query Tool|myHost(59562)|6828ERROR: cache lookup failed for attribute 3 of relation 38264
2012-04-18 22:44:25 CEST|myDatabase|postgres|pgAdmin III - Query Tool|myHost(59562)|6828STATEMENT: EXPLAIN (ANALYZE off, VERBOSE on, COSTS on, BUFFERS off )WITH t as (
INSERT INTO "tblDerived1" (id, "Data1")
VALUES ('a', 123)
RETURNING *)
UPDATE "tblBase"
SET "SomeData" = (SELECT ser FROM t)
WHERE id = (SELECT id FROM t)
I think maybe VERBOSE option is a problem, but not sure.
environment:
pgAdmin 1.14.2 (Mandriva Linux 64 bit)
PostgreSQL 9.1.3 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-46), 64-bit
Thanks in advance for any help.
Regards,
Bartek
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