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環境:
カスタムフィールドのインデックス
解決策:
データベース索引は、特定のデータベース列でフィルタリングされたデータ検索の速度を向上させるフィーチャーで、フィールドに対するより高価な更新を犠牲にします。 一般的に、頻繁に選択され、頻繁に更新されるフィールドには索引を付ける必要があります。
たとえば、連絡先の生年月日のカスタムフィールドは、生年月日が変更されないため索引付けされるのが最善で、索引は生年月日でフィルタリングする場所のクエリのスピードアップに役立ちます。
逆に、頻繁に更新されるフィールドにはインデックスを付けるべきではありません。 たとえば、連絡先の最終ログイン日のカスタムフィールドは、インデックスが書き込み操作を遅くし、変更が1日に数回行われた場合に不必要な負荷がかかる可能性があるため、インデックスに登録しないでください。
カスタムフィールドのインデックス作成の影響について詳しくは Answer ID 1266: Impact of indexing a custom field