system.users集合
system.users 集合的Schema
{
_id: <system defined id>,
userId : <system assigned UUID>, // Starting in MongoDB 4.0.9
user: "<name>",
db: "<database>",
credentials: { <authentication credentials> },
roles: [
{ role: "<role name>", db: "<database>" },
...
],
customData: <custom information>,
authenticationRestrictions : [ <documents> ] // Starting in MongoDB 4.0
}Example
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