> db.runCommand({listCollections: 1})
{
	"cursor" : {
		"id" : NumberLong(0),
		"ns" : "test.$cmd.listCollections",
		"firstBatch" : [
			{
				"name" : "c",
				"type" : "collection",
				"options" : {
					
				},
				"info" : {
					"readOnly" : false
				}
				“idIndex”: {
					"v" : 1,
					"key" : {
						"_id" : 1
						},
					"name" : "_id_",
					"ns" : "test.c"
				}
			},
			…
]	
}
}