DATABASES-EXPLAINED5 MIN READ
Read Replica Lag Is a Product Decision
Explain replica lag by tying read freshness to user expectations and SLOs.
Owen O Customer support lead L Lag F Freshness S SLO The complaint 20 sec User moment Owen says, "Customers pay, then the confirmation page says no order found. They think we charged them without an order." The database optimization is technically working and still violating user trust. 4s replica lag 2x support tickets
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