Question 1

What's the difference between pgvector and Pinecone?

Accepted Answer

pgvector is a PostgreSQL extension, use it if you already have Postgres and want to avoid another database. Pinecone is a managed SaaS vector database with built-in scaling, filtering, and multi-tenancy. Choose pgvector for simplicity and cost; Pinecone for enterprise-grade availability and zero ops overhead.

Question 2

Do I need a vector database or can I just use embeddings in JSON?

Accepted Answer

JSON storage works for tiny datasets (<10k vectors). As soon as you need to scale, filtering, or multi-tenant isolation, a proper vector database becomes essential. ANN indexing (HNSW, IVF) makes similarity queries 100-1000× faster.

Question 3

How does hybrid search work?

Accepted Answer

Hybrid search combines vector similarity with metadata filters. Query a vector database for top-k semantic matches, then apply exact/range filters (e.g., date range, category) to narrow results. This avoids the cold-start problem and improves relevance.

Question 4

What embedding model should I use?

Accepted Answer

Model quality matters more than database choice. Use OpenAI's text-embedding-3-large for English text, Cohere embed-english-v3.0 for enterprise, or open-source options (sentence-transformers) for privacy. Benchmark your domain-specific queries before picking.

Question 5

Can I use vector databases for non-AI applications?

Accepted Answer

Yes, any high-dimensional data (image features, audio fingerprints, user behavior vectors) can be stored and searched. But the ROI is highest for NLP-driven features like semantic search, chatbots, and recommendation engines.

Question 6

How do I evaluate vector database performance?

Accepted Answer

Measure recall (% of true top-k neighbors found), latency (query time), and throughput (qps). Benchmark on your actual data size and embedding model. Dataset and index type (HNSW vs IVF vs Product Quantization) have outsized impact.

Question 7

What's the cost to run a vector database in production?

Accepted Answer

pgvector: PostgreSQL hosting cost only (~$100-500/mo). Pinecone: $0.40/month per 1M vectors + $0.50/month per 1M queries. Weaviate self-hosted: ~$500-2000/mo for HA setup. Costs scale with data size and query volume.

प्रदेश	ज्युनियर	मध्यम	सीनियर
USA	$95k	$165k	$220k
UK	£70k	£120k	£160k
EU	€60k	€105k	€145k
CANADA	C$85k	C$150k	C$200k

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