DB

RedisIndex(인덱슀)?DB Transaction & Lockλ™μ‹œμ„± μ œμ–΄μ— κ΄€ν•˜μ—¬Lock(잠금)μ΄λž€?ActiveRecord lock vs with_lockTable lock vs Row lockWHERE 1=1 ꡬ문에 λŒ€ν•˜μ—¬COUNT(*) vs COUNT(indexed column)πŸ“•κ΄€κ³„ν˜• λ°μ΄ν„°λ² μ΄μŠ€ μ‹€μ „μž…λ¬ΈπŸ“”SQL μ²«κ±ΈμŒπŸ“”λͺ¨λ‘μ˜ SQL
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