Colton A Smith wrote:
Hi:
I have a table called sensors:
Table "public.sensor"
Column | Type | Modifiers
-----------------+--------------------------+-------------------------------------------------
sensor_id | integer | not null default
nextval('sensor_id_seq'::text)
sensor_model_id | integer | not null
serial_number | character varying(50) | not null
purchase_date | timestamp with time zone | not null
variable_id | integer | not null
datalink_id | integer | not null
commentary | text |
Indexes:
"sensor_pkey" PRIMARY KEY, btree (sensor_id)
Foreign-key constraints:
"datalink_id_exists" FOREIGN KEY (datalink_id) REFERENCES
datalink(datalink_id) ON DELETE RESTRICT
"sensor_model_id_exists" FOREIGN KEY (sensor_model_id) REFERENCES
sensor_model(sensor_model_id) ON DELETE RESTRICT
"variable_id_exists" FOREIGN KEY (variable_id) REFERENCES
variable(variable_id) ON DELETE RESTRICT
Currently, it has only 19 rows. But when I try to delete a row, it takes
forever. I tried restarting the server. I tried a full vacuum to no
avail. I tried the following:
explain analyze delete from sensor where sensor_id = 12;
QUERY PLAN
------------------------------------------------------------------------------------------------
Seq Scan on sensor (cost=0.00..1.25 rows=1 width=6) (actual
time=0.055..0.068 rows=1 loops=1)
Filter: (sensor_id = 12)
Total runtime: 801641.333 ms
(3 rows)
Can anybody help me out? Thanks so much!
I'd say the obvious issue would be your foreign keys slowing things down. Have
you analyzed the referenced tables, and indexed the columns on the referenced
tables?
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