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NoSQL showdown: MongoDB vs. Couchbase

Which NoSQL database has richer querying, indexing, and ease of use?

By Rick Grehan, InfoWorld, 03/21/13

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Whatever configuration you choose, it's important to realize that a design document can hold multiple views and the configuration applies to all views in the document. If you update one index, all indexes in the document will be updated.

Finally, Couchbase distinguishes between development and production views, and the two are kept in separate namespaces. Development views can be modified; production views cannot. The reason for the distinction arises from the fact that, if you modify a view, all views in that design document will be invalidated, and all indexes defined by mapreduce functions in the design document will be rebuilt. Therefore, development views enable you to test your view code in a kind of sandbox before deploying it into a production view.

NoSQL deep dive: MongoDB vs. Couchbase

You can manage Couchbase Server via the Web-based management console. The view of active servers, shown above, is open to a single member of the cluster. Memory cache and disk storage usage information is readily available.

Managing Couchbase
For gathering statistics and managing a Couchbase Server cluster, the Couchbase Web Console -- available via any modern browser on port 8091 of a cluster member -- is the place to go. It provides a multitab view into cluster mechanics. The tabs include:

  • Cluster overview, which has general RAM and disk usage information (aggregated for the whole cluster). Also, operations per second bucket usage. The information is presented in a smoothly scrolling line graph.
  • Server nodes, which provides information similar to the above, but for individual members of the cluster. You can also see CPU usage and swap space usage. On this tab, you can add a new node to the cluster: Click the Add Server button and you're prompted for IP address and credentials.
  • Data buckets, which shows all the buckets on the cluster. You can see which nodes participate in the storage of a given bucket, how many items are in each bucket, RAM and disk usage attributed to a bucket, and so on.

The Couchbase Web Console provides much more information than can be covered here. An in-depth presentation of its capabilities can be found in Couchbase Server's online documentation.

For administrators who would rather perform their management duties on the metal, Couchbase provides a healthy set of command-line tools. General management functions are found in the couchbase-cli tool, which lists all the servers in a cluster, retrieves information for a single node, initiates rebalancing, manages buckets, and more. The cbstats command-line tool displays cluster statistics, and it can be made to fetch the statistics for a single node (the variety of statistical information retrieved is too diverse to list here). The cbepctl command lets you modify a cluster's RAM and disk management characteristics. For example, you can control the "checkpoint" settings, which govern how frequently replication occurs.

Other command-line tools include data backup and restore, a tool to retrieve data from a node that has (for whatever reason) stopped running, and even a tool for generating an I/O workload on a cluster member to test its performance.


For more enterprise computing news, visit InfoWorld. Story copyright InfoWorld Media Group, Inc.

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