03. High-Performance CRUD Operations, BulkWrite & Write Concerns • MongoDB & NoSQL Architecture: CRUD to Sharding & WiredTiger • Rishabh Ki Kaksha

MongoDB & NoSQL Architecture: CRUD to Sharding & WiredTiger › 03. High-Performance CRUD Operations, BulkWrite & Write Concerns

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Course Syllabus

Module 1: MongoDB Foundations, BSON & CRUD Mechanics

01. NoSQL vs SQL: CAP Theorem & Document-Oriented Architecture 02. BSON Data Types & Document Schema Design (Embedding vs Referencing) 03. High-Performance CRUD Operations, BulkWrite & Write Concerns 04. Schema Validation with JSON Schema ($jsonSchema)

Module 2: Advanced Aggregation Framework & Data Pipelines

05. Aggregation Pipeline Core: $match, $project, $group, $sort & $limit 06. Complex Transformations: $unwind, $lookup (Joins) & $facet (Multi-Facet Analytics) 07. Window Operators ($setWindowFields) & Accumulator Functions

Module 3: Indexing Strategies & Query Optimization

08. B-Tree Indexes in MongoDB: Single Field, Compound & Partial Indexes 09. Special Indexes: TTL (Time-To-Live), Geospatial (2dsphere) & Text Indexes 10. Query Profiling, explain("executionStats") & Index Covering Analysis

Module 4: Storage Engine Internals (WiredTiger) & ACID Transactions

11. WiredTiger Storage Engine Architecture: Cache, Compression & Checkpoints 12. Read Concerns (local, majority, linearizable) & Write Concerns (w:majority, j:true) 13. Multi-Document Distributed ACID Transactions with Sessions

Module 5: High Availability, Replica Sets, Sharding & Backups

14. Replica Sets Architecture: Primary Election, Oplog & Automatic Failover 15. Sharding Architecture: mongos Router, Config Servers & Shard Key Selection 16. Range vs Hash Sharding, Chunk Balancing & Jumbo Chunks Mitigation 17. Change Streams: Building Real-Time Event-Driven Pipelines with MongoDB 18. Production Backup Strategies: mongodump/mongorestore, Point-in-Time & Atlas CLI

Interactive Lesson Studio

# 03. High-Performance CRUD Operations, BulkWrite & Write Concerns

> MongoDB Notes by Rishabh - Topic 03

---

### 1. Atomic Field Operators (`$set`, `$inc`, `$push`, `$addToSet`)

```javascript
// 1. In-place Atomic Increment (No race conditions!):
await db.collection('posts').updateOne(
    { _id: postId },
    { 
        $inc: { views: 1, likes: 1 },
        $push: { tags: "trending" } // Allows duplicates
        // $addToSet: { tags: "trending" } // Prevents duplicates (Set behavior)
    }
);
```

---

### 2. High-Throughput `bulkWrite()` (1 Network Roundtrip ⚡)

Agar 10,000 documents insert/update karne hon, toh 10,000 alag calls bhejna suicide hai. `bulkWrite()` sabko 1 batch me execute karta hai:

```javascript
await db.collection('inventory').bulkWrite([
    { insertOne: { document: { sku: "A1", qty: 100 } } },
    { updateOne: { filter: { sku: "A2" }, update: { $inc: { qty: -5 } } } },
    { deleteOne: { filter: { sku: "A3" } } }
], { ordered: false }); // 'ordered: false' runs in parallel across shards!
```

---

### 3. Write Concerns: Durability vs Speed ⚖️

*   **`w: 1` (Fast):** Primary node ke RAM me write hote hi success return karta hai.
*   **`w: "majority"` (Safe - Big Tech Standard):** Majority replica set nodes ke memory me commit hone ke baad success deta hai.
*   **`j: true` (Journaling):** Disk par On-Disk WAL Journal file flush hone ke baad confirm karta hai (100% Power Outage Proof).

---

### 4. Master Comparison Matrix

| Write Concern | Speed | Durability | Failover Safety |
| :--- | :--- | :--- | :--- |
| **`{ w: 0 }` (Unacknowledged)** | 🚀 Extreme | ❌ None | Data lost on network glitch |
| **`{ w: 1 }`** | ⚡ Fast | Moderate | Data lost if primary dies before replication |
| **`{ w: "majority", j: true }`**| Moderate | 🛡️ **Maximum Durability** | **Zero Data Loss Guarantee** |

---

### 5. Interview Ke 3 Sawal Is Topic Se

1. **`ordered: true` vs `ordered: false` me bulkWrite me kya difference hai?** -> `ordered: true` sequential execute hota hai aur 1st error aate hi baki operations abort kar deta hai; `ordered: false` parallel execute hota hai aur saare valid operations complete karta hai.
2. **`$set` lagaye bina document update karne par kya danger hota hai?** -> Purana document poora replace ho jata hai aur baki saari unmentioned fields delete ho jaati hain.
3. **Write concern `w: "majority"` me majority count kaise calculate hota hai?** -> `Math.floor(totalVotingMembers / 2) + 1` (Jaise 3-node replica set me 2 nodes).

---
**Next Topic:** 04. Schema Validation with JSON Schema ($jsonSchema)

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