The word key space (or keyspace) is used in
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Key space (cryptography)
In cryptography, key size, key length, or key space refer to the number of bits in a key used by a cryptographic algorithm (such as a cipher).
Key length defines the upper-bound on an algorithm's security (i.e. a logarithmic measure of the fa ...
for an algorithm refers to the set of all possible keys that can be used to initialize it
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Keyspace (distributed data store)
A keyspace (or key space) in a NoSQL data store is an object that holds together all column families of a design. It is the outermost grouping of the data in the data store. It resembles the schema concept in Relational database management sys ...
, an object in NoSQL data stores that can be seen as a schema in RDBMS databases
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