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Milvus Limits

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.

Length of a resource name

Resource Limit
Collection 255 characters
Field 255 characters
Index 255 characters
Partition 255 characters

Naming rules

The name of a resource can contain numbers, letters, and underscores (_). A resource name must start with a letter or an underscore (_).

Number of resources

Resource Limit
Collection 65,536
Connection / proxy 65,536

Number of resources in a collection

Resource Limit
Partition 4,096
Shard 256
Field 256
Index 1
Entity unlimited

Length of a string

Data type Limit
VARCHAR 65,535

Dimensions of a vector

Property Limit
Dimension 32,768

Input and Output per RPC

Operation Limit
Insert 512 MB
Search 512 MB
Query 512 MB

Load limits

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.

Search limits

Vectors Limit
topk (number of the most similar result to return) 16,384
nq (number of the search requests) 16,384
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