How best to batch POST / PUT requests to BAAS?

[#1]

The PUT / update part of this question is encapsulated by this StackOverflow question:

http://stackoverflow.com/questions/26135639/update...

Question at time of writing:

Update large datasets in apigee baas?

I have a scenario where a collection in the BaaS will have to be updated frequently. As I understand, to insert entities into a collection, I can do single HTTP POST requests with the payload containing an array of entities.

However, using HTTP PUT, I have to insert a single entity per request and I'm not sure about its performance.

What is the best / recommended way of updating a collection with a large number of entities?

There is documentation here:

http://apigee.com/docs/app-services/content/updati...

But it seems to be to update all entities in a collection, rather than specific ones (identified by either their name or UUID, which is really what I am after). My use case could be described as wanting to do this, but with a SQL WHERE clause attached, is this possible?

For POSTing requests, this:

https://groups.google.com/forum/#!topic/usergrid/u...

...indicates you can essentially wrap JSON entities in an array, which I presume is the best way of going about things?

Thanks,

-Rob