MongoDB to HCL OneDB term mapping

The commonly used MongoDB terminology and concepts are mapped to the equivalent HCL OneDB™ terminology and concepts.

The following table provides a summary of commonly used MongoDB terms and their HCL OneDB conceptual equivalents.

Table 1. MongoDB concepts mapped to one or more HCL OneDB concepts.
MongoDB concept	HCL OneDB concept	Description
collection	table	In HCL OneDB, a collection (also referred to as a JSON collection) is just a special type of table. A JSON collection is similar to a relational database table, except it does not enforce a schema.
document	record / row	In HCL OneDB, a document is sometimes referred to as a JSON document and is stored as a record or row in a JSON collection (table).
field	column	While JSON documents allow for the storage of unstructured data with a flexible schema, you can also think of fields within the JSON document as similar to relational columns in that they define the attributes contained within the record.
primary / secondary	primary server / secondary server	The MongoDB primary and secondary is equivalent to the HCL OneDB primary server and secondary server. However HCL OneDB secondary servers have additional capabilities. For example, data on a secondary server can be updated and propagated to primary servers.
replica set	high-availability cluster	The MongoDB replica set is equivalent to the HCL OneDB high-availability clusetr. However, when the replica set is updated, it is then sent to all servers, not only to the primary server.
sharded cluster	shard cluster	In HCL OneDB, a shard cluster is a group of servers (sometimes called shard servers) that contain sharded data.
shard key	shard key	These concepts are equiavlent between MongoDB and HCL OneDB.