[SERVER-9708] Calculate config server db size Created: 16/May/13  Updated: 10/Dec/14  Resolved: 28/May/13

Status: Closed
Project: Core Server
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Question Priority: Minor - P4
Reporter: Nick Demyanchuk Assignee: Stennie Steneker (Inactive)
Resolution: Done Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Participants:

 Description   

Is there any way to calculate approximate maximal config server database size, if I know storage limit for all mongod instances in replica sets of sharded cluster?



 Comments   
Comment by Nick Demyanchuk [ 28/May/13 ]

Thank you, Stephen!

Comment by Stennie Steneker (Inactive) [ 28/May/13 ]

Hi Nick,

The config database stores metadata about your sharded cluster, and the size is not specifically related to the storage limit of your individual mongod instances. The config database is typically very small (on the order of Mb, not Gb). The largest collection in the config database is often the changelog, which is a 10Mb capped collection. The size of the metadata will vary based on your shard keys, chunk size, and data.

The manual contains more information on the collections in the config database.

I would also note that the SERVER project is for reporting bugs or feature suggestions for the MongoDB server.

For MongoDB-related support discussion you should post on the mongodb-users group (http://groups.google.com/group/mongodb-user) or Stack Overflow / ServerFault.

Thanks,
Stephen

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