Astra Vector Store

The AstraVector class provides vector search using DataStax Astra DB, a cloud-native, serverless database built on Apache Cassandra. It provides vector search capabilities with enterprise-grade scalability and high availability.

Constructor Options

token:

string

Astra DB API token

endpoint:

string

Astra DB API endpoint

keyspace?:

string

Optional keyspace name

Methods

createIndex()

indexName:

string

Name of the index to create

dimension:

number

Vector dimension (must match your embedding model)

metric?:

'cosine' | 'euclidean' | 'dotproduct'

= cosine

Distance metric for similarity search (maps to dot_product for dotproduct)

upsert()

indexName:

string

Name of the index to upsert into

vectors:

number[][]

Array of embedding vectors

metadata?:

Record<string, any>[]

Metadata for each vector

ids?:

string[]

Optional vector IDs (auto-generated if not provided)

query()

indexName:

string

Name of the index to query

queryVector:

number[]

Query vector to find similar vectors

topK?:

number

= 10

Number of results to return

filter?:

Record<string, any>

Metadata filters for the query

includeVector?:

boolean

= false

Whether to include vectors in the results

listIndexes()

Returns an array of index names as strings.

describeIndex()

indexName:

string

Name of the index to describe

Returns:

interface IndexStats {
  dimension: number;
  count: number;
  metric: "cosine" | "euclidean" | "dotproduct";
}

deleteIndex()

indexName:

string

Name of the index to delete

updateVector()

indexName:

string

Name of the index containing the vector

id:

string

ID of the vector to update

update:

object

Update object containing vector and/or metadata changes

number[]

Record<string, any>

deleteVector()

indexName:

string

Name of the index containing the vector

id:

string

ID of the vector to delete

Response Types

Query results are returned in this format:

interface QueryResult {
  id: string;
  score: number;
  metadata: Record<string, any>;
  vector?: number[]; // Only included if includeVector is true
}

Error Handling

The store throws typed errors that can be caught:

try {
  await store.query({
    indexName: "index_name",
    queryVector: queryVector,
  });
} catch (error) {
  if (error instanceof VectorStoreError) {
    console.log(error.code); // 'connection_failed' | 'invalid_dimension' | etc
    console.log(error.details); // Additional error context
  }
}

Environment Variables

Required environment variables:

• ASTRA_DB_TOKEN: Your Astra DB API token
• ASTRA_DB_ENDPOINT: Your Astra DB API endpoint

Related

• Metadata Filters