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Editorial Team
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Asked: 2026-06-02T13:06:32+00:00

I am trying to iterate through this loop: for doc in coll.find() I get

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I am trying to iterate through this loop:

for doc in coll.find()

I get the following error at the 100,000th plus record. 

File "build\bdist.win32\egg\pymongo\cursor.py", line 703, in next
File "build\bdist.win32\egg\pymongo\cursor.py", line 679, in _refresh
File "build\bdist.win32\egg\pymongo\cursor.py", line 628, in __send_message
File "build\bdist.win32\egg\pymongo\helpers.py", line 95, in _unpack_response
pymongo.errors.OperationFailure: cursor id '1236484850793' not valid at server

what does this error mean?

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1 Answer

  1. Editorial Team

    Maybe your cursor timed out on the server. To see if this is the problem, try to set timeout=False`:

    for doc in coll.find(timeout=False)

    See http://api.mongodb.org/python/1.6/api/pymongo/collection.html#pymongo.collection.Collection.find

    If it was a timeout problem one possible solution is to set the batch_size (s. other answers).

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