Milvus is committed to providing the best vector databases to power AI applications and vector similarity search. However, the team is continuously working to bring in more features and the best utilities to enhance user experience. This page lists out some known limitations that the users may encounter when using Milvus.
| Resource | Limit |
|---|
| Collection | 255 characters |
| Field | 255 characters |
| Index | 255 characters |
| Partition | 255 characters |
The name of a resource such the collection name, partition name, or index name can contain numbers, letters, and underscores (_). A resource name must start with a letter or an underscore (_).
| Resource | Limit |
|---|
| Collection | 65,536 |
| Connection / proxy | 65,536 |
| Resource | Limit |
|---|
| Partition | 1,024 |
| Shard | 16 |
| Field | 64 |
| Index | 1 |
| Entity | unlimited |
| Data type | Limit |
|---|
| VARCHAR | 65,535 |
| Property | Limit |
|---|
| Dimension | 32,768 |
| Operation | Limit |
|---|
| Insert | 64 MB |
| Search | 64 MB |
| Query | 64 MB |
In current release, data to be load must be under 90% of the total memory resources of all query nodes to reserve memory resources for execution engine.
| Vectors | Limit |
|---|
topk (number of the most similar result to return) | 16,384 |
nq (number of the search requests) | 16,384 |
The following table provides an overview of the support for various search behaviors across different index types.
| HNSW | DISKANN | FLAT | IVF_FLAT | IVF_SQ8 | IVF_PQ | SCANN | GPU_IFV_FLAT | GPU_IVF_PQ | GPU_CAGRA | GPU_BRUTE_FORCE | SPARSE_INVERTED_INDEX | BIN_FLAT | BIN_IVF_FLAT |
|---|
| Basic search | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Partition search | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Basic search with raw data retrieved | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Basic search with pagination | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Filtered search | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Range search | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | No | Yes | Yes | Yes |
| Grouping search | Yes | Yes | Yes | Yes | Yes | No | Yes | No | No | No | No | Yes | No | No |
| Search with iterator | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | No | Yes | Yes | Yes |
| Hybrid search | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes(Only RRFRanker) | Yes | Yes |
| Query/Get | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Query with iterator | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | No | Yes | Yes | Yes |
