# Limitations and restrictions Amazon S3 Vectors has certain limitations and restrictions that you should be aware of when planning your vector storage and search applications. + Vector buckets per AWS Region in an account: 10,000 + Vector indexes per vector bucket: 10,000 + Vectors per vector index: Up to 2 billion + Dimension value per vector: 1 to 4,096 + Total metadata per vector: Up to 40 KB (filterable \$1 non-filterable) + Total metadata keys per vector: Up to 50 + Filterable metadata per vector: Up to 2 KB + Non-filterable metadata keys per vector index: Up to 10 + Combined PutVectors and DeleteVectors requests per second per vector index: Up to 1,000 + Combined vectors inserted and deleted per second per vector index: Up to 2,500 + Request payload size: Up to 20 MiB + Vectors per [PutVectors](https://docs.aws.amazon.com/AmazonS3/latest/API/API_S3VectorBuckets_PutVectors.html) API call: Up to 500 + Vectors per [DeleteVectors](https://docs.aws.amazon.com/AmazonS3/latest/API/API_S3VectorBuckets_DeleteVectors.html) API call: Up to 500 + Vectors per [GetVectors](https://docs.aws.amazon.com/AmazonS3/latest/API/API_S3VectorBuckets_GetVectors.html) API call: Up to 100 + Top-K results per [QueryVectors](https://docs.aws.amazon.com/AmazonS3/latest/API/API_S3VectorBuckets_QueryVectors.html) request: Up to 100 + Vectors listed per page in a [ListVectors](https://docs.aws.amazon.com/AmazonS3/latest/API/API_S3VectorBuckets_ListVectors.html) response: Up to 1,000 + Vector buckets listed per page in a [ListVectorBuckets](https://docs.aws.amazon.com/AmazonS3/latest/API/API_S3VectorBuckets_ListVectorBuckets.html) response: Up to 500. + Vector indexes listed per page in a [ListIndexes](https://docs.aws.amazon.com/AmazonS3/latest/API/API_S3VectorBuckets_ListIndexes.html) response: Up to 500. + Segment count for parallel listing in a ListVectors API call: Up to 16