PostgreSQL hängt unabhängig davon, welchen Befehl ich ausführte

Der Titel bringt es auf den Punkt. Ich verwende PostgreSQL 9.0.0 und eine Datenbank, die PostGIS verwendet.

Im Detail ist die Tabelle, mit der ich Probleme habe, ein Monster. Die Tabellennamen wurden anonymisiert.

Ich aktualisiere die Tabellen, und das erste, was ich tun musste, war das Aufheben der NULL-Einschränkung auf der schedule_id Säule. Als ich jedoch versuchte, die Anweisung auszuführen, passierte Folgendes:

xxx=# alter table locations_location alter column schedule_id drop not null;
<hangs>

Ja, nada. Ich habe dann versucht, die Kolonne mit dem gleichen Ergebnis abzulegen. Dann habe ich versucht, den Tisch fallen zu lassen, kein Ergebnis. Irgendwelche Ideen?

                                       Table "public.alpha_alpha"
       Column        |          Type          |                            Modifiers                            
---------------------+------------------------+-----------------------------------------------------------------
 id                  | integer                | not null default nextval('alpha_alpha_id_seq'::regclass)
 status              | integer                | not null
 address_line_one    | character varying(100) | not null
 address_line_two    | character varying(100) | not null
 city                | character varying(100) | not null
 city_slug           | character varying(50)  | not null
 state_id            | integer                | not null
 postal_code         | character varying(15)  | not null
 address_tip         | character varying(255) | not null
 phone               | character varying(30)  | not null
 fax                 | character varying(30)  | not null
 name                | character varying(75)  | not null
 dma_id              | integer                | 
 store_number        | character varying(5)   | not null
 store_type_id       | integer                | not null
 store_email_address | character varying(75)  | not null
 store_website       | character varying(200) | not null
 date_opened         | date                   | 
 new                 | boolean                | not null
 slug                | character varying(50)  | not null
 online_ordering_url | character varying(200) | not null
 delivery_url        | character varying(200) | not null
 has_catering        | boolean                | not null
 now_hiring          | boolean                | not null
 schedule_id         | integer                | not null
 tier                | integer                | not null
 coordinates         | geometry               | 
 schedule_display    | character varying(200) | not null default ''::character varying
 sunday_open         | time without time zone | 
 sunday_close        | time without time zone | 
 monday_close        | time without time zone | 
 tuesday_open        | time without time zone | 
 tuesday_close       | time without time zone | 
 wednesday_open      | time without time zone | 
 wednesday_close     | time without time zone | 
 thursday_open       | time without time zone | 
 thursday_close      | time without time zone | 
 friday_open         | time without time zone | 
 friday_close        | time without time zone | 
 saturday_open       | time without time zone | 
 saturday_close      | time without time zone | 
Indexes:
    "alpha_alpha_pkey" PRIMARY KEY, btree (id)
    "alpha_alpha_name_key" UNIQUE, btree (name)
    "alpha_alpha_name_state_id_key" UNIQUE, btree (name, state_id)
    "alpha_alpha_store_number_key" UNIQUE, btree (store_number)
    "alpha_alpha_city_slug" btree (city_slug)
    "alpha_alpha_city_slug_like" btree (city_slug varchar_pattern_ops)
    "alpha_alpha_coordinates_id" gist (coordinates)
    "alpha_alpha_dma_id" btree (dma_id)
    "alpha_alpha_schedule_id" btree (schedule_id)
    "alpha_alpha_slug" btree (slug)
    "alpha_alpha_slug_like" btree (slug varchar_pattern_ops)
    "alpha_alpha_state_id" btree (state_id)
    "alpha_alpha_store_type_id" btree (store_type_id)
Check constraints:
    "enforce_dims_coordinates" CHECK (st_ndims(coordinates) = 2)
    "enforce_geotype_coordinates" CHECK (geometrytype(coordinates) = 'POINT'::text OR coordinates IS NULL)
    "enforce_srid_coordinates" CHECK (st_srid(coordinates) = 4329)
Foreign-key constraints:
    "alpha_alpha_dma_id_fkey" FOREIGN KEY (dma_id) REFERENCES alpha_dma(id) DEFERRABLE INITIALLY DEFERRED
    "alpha_alpha_schedule_id_fkey" FOREIGN KEY (schedule_id) REFERENCES alpha_schedule(id) DEFERRABLE INITIALLY DEFERRED
    "alpha_alpha_state_id_fkey" FOREIGN KEY (state_id) REFERENCES countries_region(id) DEFERRABLE INITIALLY DEFERRED
    "alpha_alpha_store_type_id_fkey" FOREIGN KEY (store_type_id) REFERENCES alpha_storetype(id) DEFERRABLE INITIALLY DEFERRED
Referenced by:
    TABLE "beta_epsilon" CONSTRAINT "beta_epsilon_xxx_alpha_id_fkey" FOREIGN KEY (xxx_alpha_id) REFERENCES alpha_alpha(id) DEFERRABLE INITIALLY DEFERRED
    TABLE "beta_delta" CONSTRAINT "beta_delta_xxx_alpha_id_fkey" FOREIGN KEY (xxx_alpha_id) REFERENCES alpha_alpha(id) DEFERRABLE INITIALLY DEFERRED
    TABLE "beta_lambda" CONSTRAINT "beta_lambda_xxx_alpha_id_fkey" FOREIGN KEY (xxx_alpha_id) REFERENCES alpha_alpha(id) DEFERRABLE INITIALLY DEFERRED
    TABLE "beta_lambda" CONSTRAINT "beta_lambda_event_alpha_id_fkey" FOREIGN KEY (event_alpha_id) REFERENCES alpha_alpha(id) DEFERRABLE INITIALLY DEFERRED
    TABLE "gamma_applicant_alpha" CONSTRAINT "gamma_applicant_alpha_alpha_id_fkey" FOREIGN KEY (alpha_id) REFERENCES alpha_alpha(id) DEFERRABLE INITIALLY DEFERRED
    TABLE "alpha_alpha_services" CONSTRAINT "alpha_id_refs_id_e7506f2d" FOREIGN KEY (alpha_id) REFERENCES alpha_alpha(id) DEFERRABLE INITIALLY DEFERRED
    TABLE "news_upsilon_alpha" CONSTRAINT "news_upsilon_alpha_alpha_id_fkey" FOREIGN KEY (alpha_id) REFERENCES alpha_alpha(id) DEFERRABLE INITIALLY DEFERRED