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| // 查看所有数据库 show dbs
// 切换到 admin(如果不存在就创建) use admin
// 查看是否有用户 db.system.users.find().pretty();
// 删除用户 db.dropUser('usertest')
// 如果没有用户,直接创建 db.createUser({ user: "admin", pwd: "xxxxxxxx", mechanisms: ["SCRAM-SHA-1"], roles: [{ role: "clusterMonitor", db: "admin" },{ role: "clusterManager", db: "admin" },{ role: "clusterMonitor", db: "admin" },{ role: "clusterManager", db: "admin" },'readWriteAnyDatabase', 'dbAdminAnyDatabase', { role: "dbAdmin", db: 'dbName' }, { role: "readWrite", db: 'dbName' }] });
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