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n8n PostgreSQL high concurrency – connection pool and query optimisation

March 28, 2026
n8n PostgreSQL Errors

How to Connect n8n to Slack

February 6, 2026
n8n Automations

Sync Databases with n8n Without Data Loss or Duplication

April 4, 2026
n8n Automations
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Table of Contents

Toggle
  • Quick Diagnosis: Why Your Sync Breaks?
  • What You’ll Learn?
  • Full Sync vs Incremental Sync – Which One to Use?
  • Step 1: Set Up Your n8n Environment
    • How-To?
    • Pro Tip
    • Common Mistake
  • Step 2: Add Your Database Credentials
    • MySQL Credentials
    • PostgreSQL Credentials
    • MongoDB Example URI
    • Google Sheets Credentials
  • Step 3: Fetch Data from the Source Database
    • Basic SELECT Query (Full Sync)
    • Incremental SELECT Query (Recommended)
    • Step 3A: Persist the Last Sync Timestamp (Critical for Incremental Sync)
  • Step 4: Process the Data – Transform Fields Between Schemas
    • Simple Field Remapping (Edit Fields Node)
    • Complex Transformation (Code Node)
    • Step 4A: Normalize Timezones to UTC (Prevents Silent Sync Failures)
    • Step 4B: Handle NULL vs Empty String (Prevents Infinite Re-Sync)
  • Step 5: Insert or Update Data in the Target Database
    • MySQL UPSERT
    • PostgreSQL UPSERT
    • MongoDB Upsert
    • Google Sheets Sync
  • Step 5A: Use the Compare Datasets Node — n8n’s Most Powerful Sync Tool
    • How to Configure It?
    • Full Workflow Pattern with Compare Datasets
  • Step 6: Build One-Way Sync – All Combinations
    • Pro Tip
  • Step 7: Build Two-Way Sync
    • Basic Logic
    • How-To
    • Conflict Resolution Code Node
    • Prevent Sync Loops
  • Step 7A: Handle Large Tables with SplitInBatches
    • Workflow Pattern
    • Recommended Batch Sizes
  • Step 7B: Handle Deletes and Soft Deletes
    • Option 1: Soft Deletes (Recommended)
    • Option 2: Full Reconciliation (Daily)
  • Step 8: Schedule the Sync Automatically
    • Step 8A: Real-Time Sync via Webhook Trigger
  • Step 8B: Add Error Handling – Never Lose a Sync Silently
    • 1. Enable “Continue on Fail” on Write Nodes
    • 2. Set Up an Error Workflow
    • 3. Log Failed Rows
  • Step 9: Test Your Full Workflow
    • Test Checklist
  • Complete Workflow Reference: Node by Node
  • Real Use-Cases
    • 1. Sync MySQL ERP to PostgreSQL Analytics
    • 2. Sync PostgreSQL Production to MySQL Legacy System
    • 3. Sync MongoDB Leads to MySQL CRM
    • 4. Sync MySQL Sales Data to Google Sheets Dashboard
    • 5. Two-Way Sync Between Two PostgreSQL Databases
  • Workflow Snapshot
  • Frequently Asked Questions
    • Q. Can I use n8n to sync databases in real time?
    • Q. How do I sync only new or updated rows — not the entire table?
    • Q. How do I prevent duplicate rows when syncing with n8n?
    • Q. What is the Compare Datasets node and when should I use it?
    • Q. How do I handle records deleted from the source database?
    • Q. My records keep re-syncing even though nothing changed. What is causing this?
    • Q. How do I sync MySQL and PostgreSQL with different data types?
    • Conclusion

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