Topic Tag Archive

#MongoDB

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Databases21 Aug 2026

Why Your NestJS Aggregation Pipeline Is Slow (It's Not Your Indexes)

Most MongoDB aggregation slowdowns in NestJS come from stage order, not missing indexes. Here's how to fix $lookup memory spikes and force IXSCAN.

5 min readRead ↗

Databases15 Aug 2026

MongoDB Change Streams in NestJS Keep Dropping Events. Here's the Fix

Change Streams look production-ready in a demo and fall apart on deploy day. Here's how to persist resume tokens, batch under load, and survive replica set elections in NestJS.

6 min readRead ↗