ActiveRecordを速ãã—ãŸã„ã ã‘ã®äººç”Ÿã ã£ãŸ - QiitaHelp us understand the problem. What is going on with this article? Rails3.2ã‹ã‚‰Rails4.2ã«ä¸Šã’ãŸã‚‰ActiveRecordãŒé…ããªã£ãŸã®ã§ã€ã©ã†ã‚„ã£ã¦èª¿æŸ»ã—ã¦ã€ã©ã®ã‚ˆã†ã«å¯¾å‡¦ã—ãŸã‹ã‚’語ã£ã¦ã¿ãŸã„。 ã¨ã¦ã‚‚é•·ã„ã®ã§ã€ãƒ€ãƒ«ã„人ã¯æœ€åˆã¨æœ€å¾Œã ã‘èªã‚ã°ã‚ˆã„ã§ã™ã€‚ TL;DR 環境: Ruby 2.1.5 ARオブジェクトを大é‡ã«(ã–ã£ãã‚Š750kãらã„)loadã™ã‚‹ãƒãƒƒãƒå‡¦ç† 3.2ç³»ã§ã®å®Ÿè¡Œæ™‚é–“ã¯ç´„480sec〠4.2ç³»ã§ã¯ç´„2900sec ç´„6å€ã®æ€§èƒ½åŠ£åŒ– åŽŸå› : preloadã§æ€§èƒ½åŠ£åŒ–ã—ã¦ãŸ CollectionProxyã®ç”Ÿæˆå‘¨ã‚Šã§é…ããªã£ã¦ãŸ Rails4ã‹ã‚‰ARオブジェクトã®1attribute毎ã«Object生æˆã™ã‚‹ã®ã§é…ã„ GCã®æ™‚間も増ãˆãŸ 調査方法: Githubã®commitã€Issueã‚’
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