On Mon, Dec 10, 2012 at 11:51 PM, Andres Freund <[email protected]>wrote:
> Btw, as an example of the problems caused by renaming:
>
> postgres=# CREATE TABLE a (id serial primary key); CREATE TABLE b(id
> serial primary key, a_id int REFERENCES a);
> CREATE TABLE
> Time: 137.840 ms
> CREATE TABLE
> Time: 143.500 ms
> postgres=# \d b
> Table "public.b"
> Column | Type | Modifiers
> --------+---------+------------------------------------------------
> id | integer | not null default nextval('b_id_seq'::regclass)
> a_id | integer |
> Indexes:
> "b_pkey" PRIMARY KEY, btree (id)
> Foreign-key constraints:
> "b_a_id_fkey" FOREIGN KEY (a_id) REFERENCES a(id)
>
> postgres=# REINDEX TABLE a CONCURRENTLY;
> NOTICE: drop cascades to constraint b_a_id_fkey on table b
> REINDEX
> Time: 248.992 ms
> postgres=# \d b
> Table "public.b"
> Column | Type | Modifiers
> --------+---------+------------------------------------------------
> id | integer | not null default nextval('b_id_seq'::regclass)
> a_id | integer |
> Indexes:
> "b_pkey" PRIMARY KEY, btree (id)
>
Oops. I will fix that in the next version of the patch. There should be an
elegant way to change the dependencies at the swap phase.
--
Michael Paquier
http://michael.otacoo.com
