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Schema-less Data Model

A fundamental aspect of NoSQL databases where the structure of data is not rigidly predefined, offering flexibility and adaptability.

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The statement of the theorem

Let

\mathcal{D}

be the set of all data records. A record

d \in \mathcal{D}

is defined as a map

d: K \to V

, where

K

is the set of keys and

V

is the set of values. The schema-less nature implies that for any two records

d_1, d_2 \in \mathcal{D}

, the domain of keys

K_1 = \text{dom}(d_1)

and

K_2 = \text{dom}(d_2)

are not constrained to be equal, i.e.,

K_1 \neq K_2

is permitted, provided that

d_1

and

d_2

are both valid instances of the data type

\mathcal{T}