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RedisIndex(์ธ๋ฑ์Šค)?DB Transaction & Lock๋™์‹œ์„ฑ ์ œ์–ด์— ๊ด€ํ•˜์—ฌLock(์ž ๊ธˆ)์ด๋ž€?ActiveRecord lock vs with_lockTable lock vs Row lockWHERE 1=1 ๊ตฌ๋ฌธ์— ๋Œ€ํ•˜์—ฌCOUNT(*) vs COUNT(indexed column)๐Ÿ“•๊ด€๊ณ„ํ˜• ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ์‹ค์ „์ž…๋ฌธ๐Ÿ“”SQL ์ฒซ๊ฑธ์Œ๐Ÿ“”๋ชจ๋‘์˜ SQL
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