Suggest an editImprove this articleRefine the answer for “Why is it important to separate read and write load?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)Separating **read** and **write** load matters because these operations affect database performance differently and need different resources: writes (`INSERT`, `UPDATE`, `DELETE`) lock rows or tables to preserve data integrity, and if these run on the same server as a flood of `SELECT` queries, reads start to slow down. **Key point:** in a typical architecture, reads get spread across replicas (read replicas), while writes go only to the primary server (master) - this eliminates conflicts and improves fault tolerance, since a replica can be temporarily promoted to primary if the master goes down.Shown above the full answer for quick recall.Answer (EN)ImageSeparating **read** and **write** load matters because these operations affect database performance differently and need different resources. ### The main reasons 1. **Performance balance.** Writes (`INSERT`, `UPDATE`, `DELETE`) lock rows or tables to preserve data integrity. If these run on the same server as a flood of `SELECT` queries, reads start to slow down. 2. **Using replicas.** In a typical architecture, reads get spread across replicas (read replicas), while writes go only to the primary server (master). This lets thousands of read requests get handled without overloading the master. 3. **Minimizing conflicts.** If reads and writes happen simultaneously on the same node, locks, delays, and longer response times can result. Separating them eliminates these conflicts. 4. **Improved fault tolerance.** If the master goes down, a replica can be temporarily promoted to primary, keeping the system available. So separating read and write traffic is key to a scalable, stable, and fast database architecture.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.