System.keys collection in admin db

Kim_Hakseon · August 6, 2021, 6:25am

I found system.keys collection in admin db.

This collection is accessible only if it had the __system role.

But there is no explanation for this collection in the manual, so what collection is this?

chris · August 6, 2021, 1:17pm

Its for Sharding Internals:

mongodb/mongo/blob/6078864280613cf9abf901855f09ba03d18a5953/src/mongo/db/s/README.md#key-management

# Sharding Internals

## Recommended prerequisite reading

A reader should be familiar with the
[**general concept**](https://docs.mongodb.com/manual/sharding/#sharding)
of horizontal scaling or "sharding", the
[**architecture of a MongoDB sharded cluster**](https://docs.mongodb.com/manual/sharding/#sharded-cluster),
and the concept of a
[**shard key in MongoDB**](https://docs.mongodb.com/manual/sharding/#shard-keys).

---

# Routing

There is an authoritative routing table stored on the config server replica set, and all nodes cache
the routing table in memory so that they can route requests to the shard(s) that own the
corresponding data.

## The authoritative routing table

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Kim_Hakseon · August 9, 2021, 2:41am

Hi, @chris
Your answer was really helpful to me.
Thank you.

system · August 14, 2021, 2:41am

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