about create collection

[hxlsky]

what means when create collection about the selected list?

[yhmo]

Milvus is basically a distributed database. Consistency level is to maintain the data consistency between nodes(data nodes, query nodes, index nodes, etc.)
https://milvus.io/docs/consistency.md

To the client, consistency level affects the data visibility of search/query.
You insert some data, you call search() immediately with consistency_level="Strong", the data you just inserted is visible to the search.
You insert some data, you call search() immediately with consistency_level="Eventually", the data you just inserted may be invisible to the search.

[hxlsky]

how many replicate for data in milvusdb?

[yhmo]

No replica in storage. If you want multiple replicas in storage, you need a distributed minio/s3 service as milvus storage.
Replica in memory for search, default is 1: https://milvus.io/docs/replica.md#In-Memory-Replica

[hxlsky]

this means the milvus replica is depend on the third service? it has no the replica concept by itself？

[yhmo]

This is milvus in-memory replica, managed by milvus itself.
Replica in memory for search, default is 1: https://milvus.io/docs/replica.md#In-Memory-Replica

Data is stored in third-party service such as minio, gcs or azure, these services manage the data replicas by their configurations.
If these services already do a good job of data storage, why does milvus need to do everything alone?