Weaviate

Weaviate is an open-source vector database with built-in vectorization, hybrid search, and GraphQL API, combining vector similarity search with traditional database features and enabling retrieval-augmented generation (RAG) workflows.

What Is Weaviate?

• Definition: Vector database with integrated vectorization and search
• Key Feature: Auto-vectorization (embed text on insert)
• Hybrid Search: Combine vector similarity with keyword search
• API: GraphQL for flexible querying
• Deployment: Docker, Kubernetes, or managed cloud
• Use Cases: Semantic search, RAG, recommendations, multi-modal search

Why Weaviate Matters

• Built-in Vectorization: No separate embedding step needed
• Hybrid Search: Unique advantage combining vector + keyword
• Generative Search: Integrate LLMs into search results
• GraphQL: Flexible query language (no fixed schema)
• Open Source: Self-hostable with Weaviate Cloud option
• RAG Ready: Designed specifically for RAG pipelines
• Modular: Extend with custom vectorizers and modules

Key Features

Auto-Vectorization:
- Built-in models: OpenAI, Cohere, HuggingFace
- Text automatically embedded on insertion
- No manual embedding step needed
- Configurable per class

Hybrid Search:

query {
  Get {
    Article(
      hybrid: {query: "machine learning"}
      alpha: 0.5  # 0=keyword, 1=vector, 0.5=balanced
    ) {
      title
      content
      _additional {score}
    }
  }
}

Generative Search (RAG):

query {
  Get {
    Article(
      nearText: {concepts: ["quantum computing"]}
    ) {
      title
      content
      _additional {
        generate(
          singlePrompt: "Summarize this: {content}"
        ) {
          singleResult
        }
      }
    }
  }
}

Multi-Tenancy:
- Separate data per tenant
- Isolated security and performance
- Perfect for SaaS applications

Vector Types:
- Single vector per object (standard)
- Named vectors (multiple embeddings)
- Multi-modal vectors (CLIP for image+text)

Quick Start Workflow

# Pull image
docker pull semitechnologies/weaviate:latest

# Run with compose
docker-compose up

# Connect
curl http://localhost:8080

# Schema ready for queries immediately

Python Example

import weaviate

# Connect
client = weaviate.Client("http://localhost:8080")

# Create schema
schema = {
    "class": "Article",
    "vectorizer": "text2vec-openai",  # Auto-vectorize!
    "properties": [
        {"name": "title", "dataType": ["text"]},
        {"name": "content", "dataType": ["text"]},
        {"name": "author", "dataType": ["text"]}
    ]
}
client.schema.create_class(schema)

# Add data (auto-vectorized!)
client.data_object.create(
    class_name="Article",
    data_object={
        "title": "AI in Healthcare",
        "content": "Artificial intelligence transforms medicine...",
        "author": "Jane Doe"
    }
)

# Vector search
result = client.query.get("Article", ["title", "content"]).with_near_text({
    "concepts": ["medical AI applications"]
}).with_limit(10).do()

Built-in Vectorizers

Hybrid Search Example

# Combines keyword + vector search
result = client.query.get("Article", ["title"]).with_hybrid(
    query="machine learning",  # Keyword part
    alpha=0.5  # 50/50 keyword and vector
).do()

Generative Search (RAG Example)

# Search + generate answer in one query
result = client.query.get("Article", ["title", "content"]).with_near_text({
    "concepts": ["quantum computing"]
}).with_generate(
    single_prompt="Summarize this article in 50 words: {content}"
).do()

# Result includes both search and generation

Use Cases

Semantic Search:
- Find similar documents
- More intuitive than keyword search
- Great for knowledge bases

RAG (Retrieval Augmented Generation):
- Retrieve relevant documents
- Pass to LLM for generation
- Reduce hallucinations

Recommendation Systems:
- Find similar products/content
- Content-based recommendations
- User-based with embeddings

Multi-Modal Search:
- Search by text and images
- Medical imaging similarity
- Visual search experiences

Knowledge Graphs:
- Structured + vector search
- Connected data exploration
- Relationship discovery

Customer Support:
- Find similar past tickets
- Quick answer suggestions
- FAQ matching

Deployment Options

Docker (Single command):

docker run -p 8080:8080 semitechnologies/weaviate

Kubernetes (Cloud-native):

helm install weaviate weaviate/weaviate

Weaviate Cloud (Managed):
- Auto-scaling
- Multi-region support
- Automated backups
- Support included

Self-Hosted (Complete control):
- Docker, binary, or Kubernetes
- Full data privacy
- Custom configurations

Pricing Model

• Open Source: Free forever, self-hosted only
• Weaviate Cloud Service: $50-$999+/month based on scale
• Enterprise: Custom pricing with SLA

Integration Ecosystem

LLM Frameworks:
- LangChain: First-class Weaviate integration
- LlamaIndex: RAG pipeline support
- Haystack: Search framework integration

Data Tools:
- Airflow: Data pipeline orchestration
- Kafka: Event streaming
- Databricks: Data lakehouse integration

APIs:
- REST API: Standard HTTP queries
- GraphQL: Full query flexibility
- WebSocket: Real-time updates

Weaviate vs Alternatives

Best Practices

1. Choose Right Vectorizer: OpenAI for quality, local for privacy
2. Use Hybrid Search: Combine vector + keyword for better results
3. Query Optimization: Use filters to reduce vector search space
4. Module Selection: Leverage generative search for RAG
5. Backup Strategy: Enable automated snapshots
6. Monitoring: Track query latency and success rates
7. Schema Design: Match use case to object structure
8. Testing: Validate results on representative queries

Common Patterns

FAQ Search:
1. Add FAQs as objects (vectorized automatically)
2. User asks question
3. Hybrid search finds relevant FAQ
4. Generative search summarizes answer

Document Search:
1. Upload documents
2. Chunk into sections
3. Each section auto-vectorized
4. Hybrid search + generate answers

E-Commerce:
1. Product catalog vectorized
2. User searches naturally
3. Semantic + keyword results
4. Similar product recommendations

Customer Support:
1. Ticket database auto-vectorized
2. New ticket compared to similar past tickets
3. Suggested solutions from similar cases
4. Team productivity boost

Weaviate is the intelligence layer for semantic search and RAG — unique combination of auto-vectorization, hybrid search, and generative capabilities makes it perfect for applications needing intelligent retrieval and production RAG pipelines.