How to Fix 53300 Database Connection Error | DB Slots Full | System Exception While Activating API
How to fix System Exception: An Exception thrown while Activating | 53300 - Database Connection Errors | DB Slot are Full or Exceeded | API Fix #datadogs #errors
Are you getting this error in your .NET API?
System Exception: An exception was thrown while activating...
PostgreSQL Error 53300: too many connections
Database connection slots are full / exceeded
In this video, I explain:
✔ What 53300 database error means
✔ Why DB slots get full
✔ Connection pool exhaustion vs connection exhaustion
✔ How to fix it in .NET (Entity Framework / Npgsql)
✔ How to monitor using Datadog
✔ Best practices to avoid future failures
This issue usually happens due to:
Unclosed DB connections
Incorrect DbContext lifetime
High traffic spikes
Low max_connections in PostgreSQL
Connection pool misconfiguration
Also find below troubleshoot steps:
Check active connections
Tune max_connections
Fix dependency injection scope
Use proper connection pooling
Restart app pool (temporary fix)
🔥 This is very common in production APIs running on:
.NET Core / .NET 6 / .NET 7
PostgreSQL
Azure / AWS
IIS / Kestrel
Datadog monitoring
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#dotnet #postgresql #database #api #datadog #connectionpool #backenddevelopment