How are images viewed in CouchDB on disk?

Question

I understand that CouchDB views are pre-computed, now I wonder what storage cost per view is. How can this be estimated? Is this the raw JSON size for the emitted data?

To be more specific, this is BigCouch (Cloudant).

Answer 1

I cannot give you a rule for evaluation, but here you must consider several factors.

• CouchDB uses storage only for applications, so your database (and view) files will grow as you update data. To free up unused space, compaction is required.
• Disk size data can be extracted using the _info endpoint of the project document
• CouchDB uses a B-tree data structure for indexing, so a serialized JSON space + some overhead for the tree is required for presentation
• Starting with version 1.2, CouchDB by default compresses the database and browses files using snappy
• If you are interested in insides, there are discussions here , here , here and here .