Shulou(Shulou.com)06/01 Report--

Reason

MongoDB will save the sharded collection in the config.collection collection, and if you need to view the sharding key, you need to find it according to this collection. Many other official sharding shortcut commands are also in the config library.

There are three ways to query the config database.

This method can view the sharding key information.

Db.collections.find ({$and: [{'dropped': {$ne:true}}) / / {'name':'/dbname/'}] / / Fuzzy query based on database name}) View data distribution use dbname db.colname.getShardDistribution () # the easiest way to view data distribution is use databaseName Db.collectionName.stats () .sharded # simply returns true or false

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