Railsã§MongoDBを使ã£ãŸãƒ¢ãƒ‡ãƒªãƒ³ã‚° - 言葉より大切ãªãƒ–ãƒã‚°
Ruby MongoDB Driver — Ruby Driver Manual 2.8 JOIN ãŒã§ããªã„ã®ã§ã€ã‚ャッシュã§ã†ã¾ã„ã“ã¨ã‚„る？ Caching to Avoid N+1 When we display our list of stories, we'll need to show the name of the user who posted the story. If we were using a relational database, we could perform a join on users and stores, and get all our objects in a single query. But MongoDB does not support joins and so, at times, requires bit of denormaliz
Atomicity and Transactions - MongoDB Manual v8.0
In MongoDB, a write operation is atomic on the level of a single document, even if the operation modifies multiple values. When multiple update commands happen in parallel, each individual command ensures that the query condition still matches. To guarantee that concurrent update commands do not conflict with each other, you can specify the expected current value of a field in the update filter. E
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データベースコãƒã‚¯ã‚·ãƒ§ãƒ³ã®å–å¾— データベースã«ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã‚·ã‚§ãƒ«ã§æŽ¥ç¶šã—ã¾ã™ã€‚(ノート: åŒã˜ã‚ˆã†ãªã“ã¨ã‚’ã€ãŠå¥½ã¿ã®ãƒ—ãƒã‚°ãƒ©ãƒ 言語ã¨ãƒ‰ãƒ©ã‚¤ãƒãƒ¼|DOCS:Drivers]を使ã†ã“ã¨ã«ã‚ˆã£ã¦ã§ãã¾ã™ã€‚ ã“ã®ã‚·ã‚§ãƒ«ã¯ã‚¤ãƒ³ã‚¿ãƒ©ã‚¯ãƒ†ã‚£ãƒ–ãªç”¨é€”ã§ä¾¿åˆ©ã§ã™) MongoDBã®JavaScriptシェルを起動ã—ã¾ã™ã€‚
Rubyistã®ãŸã‚ã®MongoDB入門
MongoDBã¨ã¯ 10gen社ãŒä¸å¿ƒã¨ãªã£ã¦é–‹ç™ºã—ã¦ã„ã‚‹éžãƒªãƒ¬ãƒ¼ã‚·ãƒ§ãƒŠãƒ«ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã€‚ 特徴 MongoDBã¯("humongous"より)ã¯ã€ã‚¹ã‚±ãƒ¼ãƒ©ãƒ–ルã€ãƒã‚¤ãƒ‘フォーマンスã€ã‚ªãƒ¼ãƒ—ンソースã€ã‚¹ã‚ーマフリーã€ãƒ‰ã‚ュメント指å‘ã§ã™ã€‚C++ã§æ›¸ã‹ã‚Œã¦ã„ã¦ã€æ©Ÿèƒ½ã¨ã—ã¦ã¯: ドã‚ュメント指å‘ストレージ (the simplicity and power of JSON-like data schemas) 動的㪠クエリー 組ã¿è¾¼ã¿ã®ã‚ªãƒ–ジェクトã¨é…列をサãƒãƒ¼ãƒˆã—ãŸå®Œå…¨ãª Index ã®ã‚µãƒãƒ¼ãƒˆã€‚ クエリー プãƒãƒ•ã‚¡ã‚¤ãƒªãƒ³ã‚° 速ㄠin-place アップデート ãƒã‚¤ãƒŠãƒªãƒ‡ãƒ¼ã‚¿ã®åŠ¹çŽ‡çš„ãªä¿å˜ large objects (例：写真や動画) レプリケーション ã¨ãƒ•ã‚§ã‚¤ãƒ«ã‚ªãƒ¼ãƒãƒ¼ã®ã‚µãƒãƒ¼ãƒˆã€‚ クラウドレベルã®ã‚¹ã‚±ãƒ¼ãƒ©ãƒ“リティ㪠自動的ãªsharding 複雑ãªé›†ç´„ã®ãŸã‚ã® MapReduce 商用
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