I was getting all collection names by function db.getCollectionNames().
But as soon as I started sharding, function db.getCollectionNames() is Not working.
How to get all collection names in database when sharding is active?
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Does very much sound like you have the wrong database selected. Check which database you are on before you issue. – Blakes Seven Aug 26 '15 at 07:14
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@BlakesSeven: I have right database selected. – Somnath Muluk Aug 26 '15 at 07:23
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Which version of MongoDB? Do you perhaps have a version 3 shell connected to older MongoDB instances? Or the other way around? – Blakes Seven Aug 26 '15 at 07:28
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Make sure you have selected a database: use <database>.
If it still does not work, try show collections.
mjuopperi
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"show collections" work on local database without sharding. But same not works on database with sharding. – Somnath Muluk Aug 26 '15 at 07:25