Tencent Cloud Developer

Jun 30, 2026 · Databases

How Kernel Optimizations Cut MongoDB Physical Backup Disk Bloat by 90%

MongoDB’s physical backup can cause hidden nodes to balloon in disk usage, but by analyzing WiredTiger’s space‑reclamation process and introducing a checkpoint‑release API, the team reduced backup‑induced disk expansion from up to 200% down to under 10%, saving hundreds of gigabytes and cutting backup time by over 40%.