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We just added a node to our replica set. After the node's state switched to SECONDARY, I do
use obs
db.stats()
on both the PRIMARY node and the new SECONDARY.
PRIMARY SECONDARY
"collections" : 19 18
"views" : 0 0
"objects" : 70926 70409
Why are numbers of objects and collections different?
OK we found why there is a discrepancy.
We were able to list the collections on the secondary node with
db.getMongo().setSlaveOk()
show collections
From there, I realized the extra collection on the primary was system.profile (I'd forgotten I'd turned on the profiler) and it's 517 documents accounted for the different object counts from db.stats()
