Verify that a. Somehow, I have ended up with an exactly duplicated row. 3. This is a “logical corruption”. Then, actually it works. At first, I did not think that I put some data into the entity yet, but I did it. But, the problem comes right back in the next >> database-wide vacuum. The statistics are then used by. Now upgrade to latest master. > >> I also tried reindexing the table. Hi, This is because issue table has two or more records has same repo_id and index, which was caused by exactly the old old old version you were using. 4. The redirect table shouldn't be this messy and should have the unique index nevertheless. Therefore, as Carl suggested, I deleted the entity and re-create it. There are no errors during the upgrade. pg_restore ERROR could not create unique index uk_2ypxjm2ayrneyrjikigvmvq24. ERROR: could not create unique index "tbl_os_mmap_topoarea_pkey" DETAIL: Key (toid)=(1000000004081308) is duplicated. The idea is to force the query to scan the table rather than just the index (which does not have the duplicates). c. g A single-null co > "Paul B. Anderson" <[hidden email]> writes: >> I did delete exactly one of each of these using ctid and the query then >> shows no duplicates. With Heroku Postgres, handling them is simple. LOG: Apr 26 14:50:44 stationname postgres[5452]: [10-2] 2017-04-26 14:50:44 PHT postgres DBNAME 127.0.0.1 DETAIL: Key (starelid, staattnum, stainherit)=(2610, 15, f) is duplicated. I could create the unique index. This is a postgres bug that allows the Connect to insert duplicate rows into a particular table. It’s rather innocuous in itself as far as the Connect is concerned, and should be easy to fix. ERROR: could not create unique index "redirect_rd_from" DETAIL: Key (rd_from)=(110) is duplicated. ERROR: could not create unique index "pg_statistic_relid_att_inh_index" DETAIL: Key (starelid, staattnum, stainherit)=(2610, 15, f) is duplicated. @IijimaYun , you're right, I remembered I had to do the same procedure about a month ago. When I first migrated, one problem I had was related to how string columns work. psycopg2.errors.UniqueViolation: could not create unique index "users_user_email_243f6e77_uniq" DETAIL: Key (email)=( [email protected] ) is duplicated. Using CTE and window functions, find out which repeated values will be kept: Thank you, indeed, Mai At the end of the upgrade, there are no rows with preview = 1 in the quiz_attempts table. b. REINDEX INDEX rank_details_pkey; ERROR: could not create unique index "rank_details_pkey" DETAIL: Table contains duplicated values. I will never forget to create unique index before testing it. Every field is the same in these two rows. 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