MongoShard Architecture Index: 8 MongoDB 8.0 WiredTiger & Replica Set Dossiers

Complete MongoShard WiredTiger & Replica Set Dossier Roster

MongoShard Dossier: MongoDB 8.0 WiredTiger (RAM − 1 GB) × 0.50 Cache Formula

In our deterministic MongoShard memory model, we explain why setting wiredTigerCacheSizeGB to 80% of host RAM triggers Linux OOM kills — and how WiredTiger splits uncompressed B-Tree pages against the compressed OS filesystem cache.

MongoShard Dossier: 3-Node MongoDB 8.0 Replica Set (P-S-S vs P-S-A) on Private VPC

In our MongoShard high-availability analysis, we compare 3-node Primary-Secondary-Secondary (P-S-S) against 2-Data + 1-Arbiter (P-S-A) topologies over isolated 10.x.x.x VPC subnets.

MongoShard Dossier: Auditing MongoDB Atlas M30 / M40 / M50 Bills & Live mongosync Cutover

In our MongoShard 12-month cost audit (based on public vendor rates retrieved 2026-11-12), we break down the four billing components behind MongoDB Atlas M30–M50 invoices and document a reversible mongosync migration workflow.

MongoShard Dossier: Percona Backup for MongoDB (PBM) to S3 with Point-in-Time Recovery

In our MongoShard backup architecture guide, we detail why running cron mongodump against a Primary pollutes WiredTiger cache — and how pbm-agent streams consistent Point-in-Time Recovery slices from a Secondary node to S3.

MongoShard Dossier: Sizing MongoDB 8.0 Oplog & Change Streams for Rocket.Chat & Graylog

In our MongoShard Change-Stream sizing guide, we show why Rocket.Chat microservices stall when webhook bursts roll over an undersized local.oplog.rs — and how to resize Oplog capacity live without restarting mongod.

MongoShard Dossier: PayloadCMS 3.0 & Next.js MongoDB 8.0 Single-Node rs0 Memory Budget

In our MongoShard full-stack memory budget, we show how to run PayloadCMS 3.0 drafts and Prisma multi-document ACID transactions on a 16 GB DDR5 KVM VPS without triggering next build OOM crashes.

MongoShard Dossier: Shrinking WiredTiger B-Tree Index RAM via ESR & Partial Filters

In our MongoShard capacity audits, bloated single-field and duplicate prefix indexes are the #1 cause of oversized Atlas tiers — learn how ESR ordering and partialFilterExpression trim WiredTiger RAM demand before upgrading hardware.

MongoShard Dossier: Horizontal Sharded Cluster vs Vertical 128 GB–256 GB NVMe VDS

In our MongoShard architecture framework, premature sharding turns a 3-node Replica Set into an 11-daemon fleet and penalizes non-shard-key queries — here is the deterministic working-set boundary where sharding becomes justified.