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Editorial Team
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Asked: 2026-06-12T02:54:42+00:00

i’m using tornado for its simplicity, and am using it with Pymongo, so because

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i’m using tornado for its simplicity, and am using it with Pymongo, so because i hear always about asynchronous calls, to serve lot of clients, then, i was asking, what is really an asynchronous calls to a database, so this code for example:

for example, suppose a page where a user have 4 areas where to search, so the result will be a 4 results.

A = calls the database to search for an element a.
B = calls the database to search for an element b.
C = calls the database to search for an element c.
D = calls the database to search for an element d.
then render a pages where a user will see the results (a,b,c,d)

so, this will be a killer for the server, since he must stay for all the 4 requests to finish, or do it serve the first result and then wait even if the database calls are blocking and make a bucket where he joins all the results to be served to the client? or the split of the 4 operations must be done with asynchronous database library (like Motor or Asyncmongo)?

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1 Answer

  1. Editorial Team

    Every call to PyMongo will block Tornado’s IOLoop and prevent further processing of any client HTTP request until the PyMongo method completes.

    http://api.mongodb.org/python/current/faq.html#does-pymongo-support-asynchronous-frameworks-like-gevent-tornado-or-twisted

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