約10年続くスマホゲームアプリのDB負荷と向き合う話
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約10年続くスマホゲームアプリのDB負荷改善を行なったので、その対応の流れをお話しました。 具体的な対応内容と言うよりは、「何をやったか」を時系列に沿って発表しました。
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約10年続くスマホゲームアプリのDB負荷と向き合う話
- 1. 約10年続く スマホゲームアプリの DB負荷と向き合う話 2021/10/18 【excite × iXIT】Tech Talk #1 Jun Ebina
- 2. 自己紹介 • 蝦名 淳（えびな じゅん） • iXIT株式会社 • サーバーサイドエンジニア • PHP,Go • 今のサービスに携わってそろそろ1年？
- 3. 本題のDB負荷
- 4. 状況 • PHP + MySQL • 今年の年始から特にDB負荷が高まっている • 毎日のイベントの開始時間にアクセスが集中 ユーザーがアプリで遊びにくい状況になっている
- 5. アプローチ
- 6. 負荷の原因を探ろうとした • アクセス集中？ • 最近リリースした機能が重い？ 負荷が高まる前後のアクセス数とアクセス先URLを確認 (2021/12/23 負荷上昇前) (2021/01/20 負荷上昇前)
- 7. • アクセス数は増えているように見える • しかし原因とまでは言い切れない • イベントの設定等にもこれと言った変更がない 方向性を変えて調査を進めることに…
- 10. 対策
- 11. SQLをチューニングする • 対応が難しいSQLは置いといて、まずはすぐ出来るものから… • インデックスを見直す • WHERE条件を追加することによって、取得件数を減らす • OR → UNIONにする • COUNT(*) → COUNT(id) • 使われないカラム、使われない条件を見直す 依然として負荷は高い
- 12. 古いレコードを削除する • 一部のテーブルの2ヶ月以上前のレコードは削除することに • バッチを作成して数週間かけて削除 • 現在は1日に一回古いレコードを削除している …依然として負荷は高い
- 13. このSQLが重い
- 14. • 同処理内で3回も実行されている • NOT IN句で除外するデータが500個ほどある上に、ユーザごと に内容が異なる • 数万件もありうる取得結果に対してORDER BY rand() LIMIT 問題のSQLについて
- 15. 対応 • 該当のデータ取得専用テーブルを用意することにした • あらかじめ条件を絞ったものを格納し、毎度のWHEREを簡素に • JOINをなくした • 専用テーブルには外部キーを格納、詳細情報は別途取得 … … …まだ負荷が高い
- 17. !！
- 18. 現時点での所感
- 19. • AccessLog,SlowQueryLogを取得できることが大前提 • 一度負荷が高まってしまうと対応は大変 • 多角的な調査が必要となり、対応には時間が必要 • 「負荷の原因」自体を特定するのは難しい • サービスが続く限り対策は続く
- 20. ありがとうございました！