PG16.3 破損インデックスの修正 (バックアップからの復元不可 - ユニークインデックス作成不可)

サポート
1

Discourse を新しいサーバーに移行しようとしたところ、バックアップの復元中に問題が発生しました。

[2024-09-12 06:57:25] ERROR:  could not create unique index "unique_post_links"
[2024-09-12 06:57:25] DETAIL:  Key (topic_id, post_id, url)=(2026, 4639, http://www.metronet.com/~mob) is duplicated.
[2024-09-12 06:57:27] EXCEPTION: psql failed: DETAIL:  Key (topic_id, post_id, url)=(2026, 4639, http://www.metronet.com/~mob) is duplicated.

インデックスの破損を修正する方法に関するトピックはたくさんありますが、ほとんどは古いものです。PG 16 のような新しいバージョンで、重複の問題を見つけて 修正するための決定的なガイドはありますか？ファイル付きのバックアップは 37GB、ファイルなしのバックアップは 5GB です。

新しい移行/復元を試みる前に、上記以外にも重複がないか確認したいと思います。移行には時間がかかるためです。

「いいね！」 1
2

しばらく発生していません。数年前と何も変わりません。

やるべきことは、インデックスがまだ実行されている場合、別のサーバーでそのインデックスを再構築し、重複する値を削除（またはその他の方法で修復）し、インデックスが最終的に再構築されたら、別のバックアップを作成して新しいサーバーに復元することです。

ただし、すべて（少なくともアップロード）をrsyncで移動することも試せるかもしれません。

「いいね！」 3
3

重複を削除しましたが、削除すべきと思われる余分なインデックスが残っています。ここにリストされているものをすべて削除してもよろしいでしょうか？

discourse=# REINDEX SCHEMA CONCURRENTLY public;
WARNING:  cannot reindex invalid index "public.topic_links_pkey_ccnew" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_extension_ccnew" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_link_post_id_and_reflection_ccnew" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_post_id_ccnew" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_topic_id_ccnew" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_user_id_ccnew" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_user_and_clicks_ccnew" concurrently, skipping
WARNING:  cannot reindex invalid index "public.unique_post_links_ccnew" concurrently, skipping
WARNING:  cannot reindex invalid index "public.topic_links_pkey_ccnew1" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_extension_ccnew1" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_link_post_id_and_reflection_ccnew1" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_post_id_ccnew1" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_topic_id_ccnew1" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_user_id_ccnew1" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_user_and_clicks_ccnew1" concurrently, skipping
WARNING:  cannot reindex invalid index "public.unique_post_links_ccnew1" concurrently, skipping
WARNING:  cannot reindex invalid index "public.topic_links_pkey_ccnew2" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_extension_ccnew2" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_link_post_id_and_reflection_ccnew2" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_post_id_ccnew2" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_topic_id_ccnew2" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_user_id_ccnew2" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_user_and_clicks_ccnew2" concurrently, skipping
WARNING:  cannot reindex invalid index "public.unique_post_links_ccnew2" concurrently, skipping
WARNING:  cannot reindex invalid index "public.topic_links_pkey_ccnew3" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_extension_ccnew3" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_link_post_id_and_reflection_ccnew3" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_post_id_ccnew3" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_topic_id_ccnew3" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_user_id_ccnew3" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_user_and_clicks_ccnew3" concurrently, skipping
WARNING:  cannot reindex invalid index "public.unique_post_links_ccnew3" concurrently, skipping
WARNING:  cannot reindex invalid index "public.topic_links_pkey_ccnew4" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_extension_ccnew4" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_link_post_id_and_reflection_ccnew4" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_post_id_ccnew4" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_topic_id_ccnew4" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_user_id_ccnew4" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_user_and_clicks_ccnew4" concurrently, skipping
WARNING:  cannot reindex invalid index "public.unique_post_links_ccnew4" concurrently, skipping
WARNING:  cannot reindex invalid index "public.topic_links_pkey_ccnew5" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_extension_ccnew5" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_link_post_id_and_reflection_ccnew5" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_post_id_ccnew5" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_topic_id_ccnew5" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_user_id_ccnew5" concurrently, skipping
WARNING:  cannot reindex invalid index "public.index_topic_links_on_user_and_clicks_ccnew5" concurrently, skipping
WARNING:  cannot reindex invalid index "public.unique_post_links_ccnew5" concurrently, skipping
WARNING:  cannot reindex invalid index "pg_toast.pg_toast_102223_index_ccnew" concurrently, skipping
WARNING:  cannot reindex invalid index "pg_toast.pg_toast_102223_index_ccnew1" concurrently, skipping
WARNING:  cannot reindex invalid index "pg_toast.pg_toast_102223_index_ccnew2" concurrently, skipping
WARNING:  cannot reindex invalid index "pg_toast.pg_toast_102223_index_ccnew3" concurrently, skipping
WARNING:  cannot reindex invalid index "pg_toast.pg_toast_102223_index_ccnew4" concurrently, skipping
WARNING:  cannot reindex invalid index "pg_toast.pg_toast_102223_index_ccnew5" concurrently, skipping
REINDEX
discourse=#
4

ccnew または ccnew’n’ を含むものはすべて削除しても問題ありません。

「いいね！」 2