How many records can insert to one "child node" in "realtime database"?

Question

Data store in the realtime database:

{     
     "users" : {
           "0c1592ca-0fa5-43b9-88d2-c9cd77b30611" : {
              "token" : "0cu9CJPb_DIUfbr-Ay8vh6:-KQXn....",
              "member_id" : "123456789102",
              "update_at" : "2021/06/14 08:08:08"
          },
           "36 random characters" : {
              "token" : "167 random characters",
              "member_id" : "12 random numbers",
              "update_at" : "YYYY/mm/DD HH:mm:ss"
          }
      }
    }

Let say a record is like this:

"36 random characters" : {
              "token" : "167 random characters",
              "member_id" : "12 random numbers",
              "update_at" : "YYYY/mm/DD HH:mm:ss"
}

How many records can insert into the "users" node like above?

Answer 1

All limits of the Firebase Realtime Database are documented in the page Realtime Database Limits. If you study that page you'll find that there is no documented limit on the number of child nodes that can exist in a given path.

There is probably a physical limit on the system, a pricing limit for you, a limit on the number of nodes you can reasonably read, and a limit on the number of nodes the system can query (typically in the order of a couple of 100K to a couple of million nodes), but aside from those the system imposes no artificial limit on how many child nodes can exist under a path.

Note that this has been asked a few times before, so I also recommend reading:

• Firebase Performance: How many children per node?
• Maximum recommended children in a Firebase Database node