Interesting!! We also met the same situation on PK running on PPAS 9.0 last night. When surfing Internet, got returned this URL :
https://www.postgresql.org/message-id/20140811083748.2536.10437%40wrigleys. postgresql.org <https://www.postgresql.org/message-id/20140811083748.2536.10437%40wrigleys.postgresql.org> You can check the reply. 2017-06-29 17:28 GMT+08:00 Timokhin Maxim <n...@yandex.com>: > Hello. > We are in process moving to new db from 9.4.8 -> 9.6.3.1. When we did it > our application started to throw exception "duplicate key value violates > unique constraint" during doing INSERT: > > INSERT INTO items (ctime, mtime, pubdate, url, title, description, body, > status, fulltext_status, orig_id, image_id, video_id, resource_id, > priority, checksum) VALUES (%(ctime)s, %(mtime)s, %(pubdate)s, %(url)s, > %(title)s, %(description)s, %(body)s, %(status)s, %(fulltext_status)s, > %(orig_id)s, %(image_id)s, %(video_id)s, %(resource_id)s, %(priority)s, > %(checksum)s) RETURNING items.id' > > Column url has unique constraint. > > > Also, we saw that during to update value into column status: > (psycopg2.IntegrityError) duplicate key value violates unique constraint > "items_url" > DETAIL: Key (url)=(http://www.domainname. > ru/ap_module/content/article/400-professional/140-professional/11880) > already exists. > [SQL: 'UPDATE items SET status=%(status)s WHERE items.id IN ( ... > )... > > > Our table: > > > Column | Type | > Modifiers > -----------------+-----------------------------+------------ > ------------------------------------------------------- > id | integer | not null default > nextval(('public.items_id_seq'::text)::regclass) > ctime | timestamp without time zone | not null default now() > pubdate | timestamp without time zone | not null default now() > resource_id | integer | not null default 0 > url | text | > title | text | > description | text | > body | text | > status | smallint | not null default 0 > image | text | > orig_id | integer | not null default 0 > mtime | timestamp without time zone | not null default now() > checksum | text | > video_url | text | > audio_url | text | > content_type | smallint | default 0 > author | text | > video | text | > fulltext_status | smallint | default 0 > summary | text | > image_id | integer | > video_id | integer | > priority | smallint | > Indexes: > "items_pkey" PRIMARY KEY, btree (id) > "items_url" UNIQUE, btree (url) > "items_resource_id" btree (resource_id) > "ndx__items__ctime" btree (ctime) > "ndx__items__image" btree (image_id) > "ndx__items__mtime" btree (mtime) > "ndx__items__pubdate" btree (pubdate) > "ndx__items__video" btree (video_id) > Foreign-key constraints: > "items_fkey1" FOREIGN KEY (image_id) REFERENCES images(id) ON UPDATE > CASCADE ON DELETE SET NULL > "items_fkey2" FOREIGN KEY (video_id) REFERENCES videos(id) ON UPDATE > CASCADE ON DELETE SET NULL > Referenced by: > TABLE "cluster_image" CONSTRAINT "cluster_image_fkey2" FOREIGN KEY > (item_id) REFERENCES items(id) ON UPDATE CASCADE ON DELETE CASCADE > TABLE "cluster_meta" CONSTRAINT "cluster_meta_item_id_fkey" FOREIGN > KEY (item_id) REFERENCES items(id) ON UPDATE CASCADE ON DELETE CASCADE > TABLE "events" CONSTRAINT "events_fkey2" FOREIGN KEY (item_id) > REFERENCES items(id) ON UPDATE CASCADE ON DELETE CASCADE > TABLE "item_cluster" CONSTRAINT "item_cluster_fkey1" FOREIGN KEY > (item_id) REFERENCES items(id) ON UPDATE CASCADE ON DELETE CASCADE > TABLE "items_blogs" CONSTRAINT "items_blogs_fkey1" FOREIGN KEY > (item_id) REFERENCES items(id) ON UPDATE CASCADE ON DELETE CASCADE > TABLE "items_reflink" CONSTRAINT "items_reflink_fkey1" FOREIGN KEY > (item_id) REFERENCES items(id) ON UPDATE CASCADE ON DELETE CASCADE > TABLE "items_related" CONSTRAINT "items_related_fkey1" FOREIGN KEY > (item_id) REFERENCES items(id) ON UPDATE CASCADE ON DELETE CASCADE > TABLE "items_summaries" CONSTRAINT "items_summaries_fkey1" FOREIGN KEY > (item_id) REFERENCES items(id) ON UPDATE CASCADE ON DELETE CASCADE > TABLE "quotations" CONSTRAINT "quotations_fkey3" FOREIGN KEY (item_id) > REFERENCES items(id) ON UPDATE CASCADE ON DELETE CASCADE > TABLE "summaries" CONSTRAINT "summaries_fkey2" FOREIGN KEY (item_id) > REFERENCES items(id) ON UPDATE CASCADE ON DELETE CASCADE > > > Everything would be not bad if in the table weren't appeared duplicated > records in url column. > Any idea how is it possible? > > Thank you! > > -- > Timokhin 'maf' Maxim > >
