VectorDB

Open-source vector database designed for simplicity and speed, with flexible deployment options.

For embedded use as a library in Java projects, see:

https://github.com/tutikka/LibVectorDB

Features

• Create and manage indexes
• Create and manage vector embeddings in indexes
• Search for embeddings in indexes based on distance
  • Cosine distance
  • Euclid distance
  • Manhattan distance

APIs

• RESTful HTTP API using JSON

Deployment

• Standalone Java application
• Docker

Installation

Binary Releases

None

Build from Source

Requirements

• Java 21 or later (tested using 21.0.10-zulu)
• Git client
• Maven
• Docker

MacOS/Linux/Unix

Clone this repository:

git clone https://github.com/tutikka/VectorDB.git

Change to cloned folder:

cd VectorDB

Clean, compile and package using Maven:

mvnw package

Change to created target directory:

cd target

Start the application:

java -jar vectordb-0.0.1-SNAPSHOT.jar

Or build a Docker image and run it, for example:

docker build -t vectordb/vectordb .
docker run -p 8080:8080 vectordb/vectordb

Configuration

The application will look for a configuration file named vectordb.properties in the root directory of the application during startup. If the file is not found, default values (shown in the example below) will be used.

#
# directory for data files (default = 'data')
#
data.directory = data

#
# maximum number of vectors per index (default = 65536)
#
data.max_vectors_per_index = 65536

Examples

Random Values

1. Create index with 3 dimensions and similarity based on manhattan distance
2. Create entries into the index with random values as embeddings
3. Search for the best matching entry based on given embedding
4. Clean up and delete index

View full source (Python)

Planet Positions

This example maps the positions of the planets in our solar system on 1.1.2025 to a 3D space using the sun as the origin, and then tests which planets are closest.

1. Create index with 3 dimensions (X, Y and Z coordinates) and similarity based on euclid distance
2. Create entries to the index for each planet based on the position at 1.1.2025
3. Search for the 3 closest planets to the sun
4. Clean up and delete index

View full source (Python)

RAG Example with OpenAI Embeddings and Chat Completion

This example is closer to a real-world scenario, where we have documents that we want to index to perform queries based on similarity, and then summarize best results based on a user's question.

1. Create index with 1536 dimensions (from OpenAI ada-002 text embedding model) and similarity based on cosine distance
2. Create entries into the index by embedding each document using the OpenAI ada-002 text embedding model
3. Search for the best matching entry based on the user's question (embedded with the same model)
4. Retrieve the original document identifier from the search results
5. Use a chat completion model (OpenAI gpt-5) to summarize the retrieved document based on the user's original question

Note! Make sure to add a .env file in the same directory with your OpenAI API Key

View full source (Python)

API

Summary

Method	URI	Description
POST	/api/indexes	Create new index
GET	/api/indexes	List indexes
GET	/api/indexes/{id}	Get index
POST	/api/indexes/{id}/entries	Create new entry into index
GET	/api/indexes/{id}/entries	List entries in index
POST	/api/indexes/{id}/search	Submit search for entries in index

Reference

Create New Index

Method

POST

URI

/api/indexes

Query Parameters

None

Request Body

{
  "name": "test",
  "dimensions": 1536,
  "similarity": "cosine",
  "optimization": "none"
}

Response Status

• HTTP 200: Ok
• HTTP 400: Error creating index due to client input
• HTTP 500: Error creating index due to server error

Response Body

{
  "id": 1,
  "name": "test",
  "dimensions": 1536,
  "similarity": "cosine",
  "optimization": "none"
}

Note! The server will populate the id field, which is used to refer to the index in other API methods.

List Indexes

Method

GET

URI

/api/indexes

Query Parameters

None

Request Body

None

Response Status

• HTTP 200: Ok

Response Body

[
    {
      "id": 1,
      "name": "test",
      "dimensions": 1536,
      "similarity": "cosine",
      "optimization": "none"
    }
]

Get Index

Method

GET

URI

/api/indexes/{id}

Query Parameters

• id: The index identifier

Request Body

None

Response Status

• HTTP 200: Ok
• HTTP 404: Index not found

Response Body

{
  "id": 1,
  "name": "test",
  "dimensions": 1536,
  "similarity": "cosine",
  "optimization": "none",    
  "extras": {
    "_max_vectors": 65536,
    "_num_vectors": 1,
    "_size_on_disk": 1310728
  }
}

Create New Entry into Index

Method

POST

URI

/api/indexes/{id}/entries

Query Parameters

• id: The index identifier

Request Body

{
    "id": 1,
    "embedding": [
        0.1,
        0.2,
        0.3
    ]
}

Response Status

• HTTP 200: Ok
• HTTP 400: Error creating entry due to client input
• HTTP 404: Index not found
• HTTP 500: Error creating entry due to server error

Response Body

{
  "id": 1,
  "embedding": [
    0.2672612,
    0.5345224,
    0.8017837
  ]
}

List Entries in Index

Method

GET

URI

/api/indexes/{id}/entries

Query Parameters

• id: The index identifier
• offset: The position in the index where to start retrieving entries
• limit: Maximun number of entries to retrieve

Request Body

None

Response Status

• HTTP 200: Ok
• HTTP 400: Error listing entries due to client input
• HTTP 404: Index not found
• HTTP 500: Error listing entries due to server error

Response Body

[
  {
    "id": 1,
    "embedding": [
      0.2672612,
      0.5345224,
      0.8017837
    ]
  },
  {
    "id": 2,
    "embedding": [
      0.37139064,
      0.557086,
      0.7427813
    ]
  },
  {
    "id": 3,
    "embedding": [
      0.4242641,
      0.56568545,
      0.70710677
    ]
  }
]

Submit Search for Entries in Index

Method

POST

URI

/api/indexes/{id}/search

Query Parameters

• id: The index identifier

Request Body

{
    "embedding": [
        0.1,
        0.2,
        0.3
    ],
    "top": 3
}

Response Status

• HTTP 200: Ok
• HTTP 400: Error searching entries due to client input
• HTTP 404: Index not found
• HTTP 500: Error searching entries due to server error

Response Body

{
  "matches": [
    {
      "id": 1,
      "distance": 5.9604644775390625E-8
    },
    {
      "id": 2,
      "distance": 0.007416725158691406
    },
    {
      "id": 3,
      "distance": 0.017292380332946777
    }
  ],
  "duration": 0,
  "scanned": 3,
  "total": 3,
  "similarity": "cosine"
}