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explain() return information about query plan. Whether an index is being used or not, and how the scan is being used. Right now, it looks something like this
In [13]: db.correctness475041058659.find({'A': { 'A': None, 'C': {}}}).explain()
Out[13]:
{u'explanation': {u'source_plan': {u'projection': u'{}',
u'source_plan': {u'bounds': {u'begin': u'3\\x10\\x00\\xff\\x00\\xff\\x00\\xff\\x0aA\\x00\\xff\\x03C\\x00\\xff\\x05\\x00\\xff\\x00\\xff\\x00\\xff\\x00\\xff\\x00\\xff\\x00',
u'end': u'3\\x10\\x00\\xff\\x00\\xff\\x00\\xff\\x0aA\\x00\\xff\\x03C\\x00\\xff\\x05\\x00\\xff\\x00\\xff\\x00\\xff\\x00\\xff\\x00\\xff\\x00'},
u'index name': u'A_1_B_1_B_1',
u'type': u'index scan'},
u'type': u'projection'},
u'type': u'non-isolated'}}
Although, this gives an overview of what’s going on. It will be much more useful if the keys are user readable, instead of FDB keys.
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