Valkey Vector Store

Valkey is an open source (BSD) high-performance key/value datastore that supports a variety of workloads and rich datastructures including vector search.

Installation

bash

pip install mem0ai[vector_stores]

Usage

python

config = {
    "vector_store": {
        "provider": "valkey",
        "config": {
            "collection_name": "test",
            "valkey_url": "valkey://localhost:6379",
            "embedding_model_dims": 1536,
            "index_type": "flat"
        }
    }
}

m = Memory.from_config(config)
messages = [
    {"role": "user", "content": "I'm planning to watch a movie tonight. Any recommendations?"},
    {"role": "assistant", "content": "How about thriller movies? They can be quite engaging."},
    {"role": "user", "content": "I'm not a big fan of thriller movies but I love sci-fi movies."},
    {"role": "assistant", "content": "Got it! I'll avoid thriller recommendations and suggest sci-fi movies in the future."}
]
m.add(messages, user_id="alice", metadata={"category": "movies"})

Parameters

Here are the parameters available for configuring Valkey:

Parameter	Description	Default Value
`collection_name`	The name of the collection to store the vectors	`mem0`
`valkey_url`	Connection URL for the Valkey server	`valkey://localhost:6379`
`embedding_model_dims`	Dimensions of the embedding model	`1536`
`index_type`	Vector index algorithm (`hnsw` or `flat`)	`hnsw`
`hnsw_m`	Number of bi-directional links for HNSW	`16`
`hnsw_ef_construction`	Size of dynamic candidate list for HNSW	`200`
`hnsw_ef_runtime`	Size of dynamic candidate list for search	`10`
`cluster_mode`	Enable cluster mode for Valkey cluster (CME) deployments	`false`
`distance_metric`	Distance metric for vector similarity	`cosine`

Cluster Mode

To use Valkey with cluster mode enabled (CME), set cluster_mode to true:

python

config = {
    "vector_store": {
        "provider": "valkey",
        "config": {
            "collection_name": "memories",
            "valkey_url": "valkey://cluster-endpoint:6379",
            "embedding_model_dims": 1536,
            "cluster_mode": True
        }
    }
}

When cluster mode is enabled, the connector uses ValkeyCluster instead of the standalone client, which handles MOVED/ASK redirections automatically. Search queries are coordinated across all shards by the valkey-search module's built-in coordinator. See the valkey-search documentation for details on cluster mode behavior.