Schema Limits
Number of Schema Elements
Datomic enforces the total number of schema elements to be fewer than 220, which includes schema attributes and value types. Attempts to create more than 220 schema elements will fail.
Namespace Restrictions
The :db
namespace, and all :db.*
namespaces, are reserved for use by
Datomic.
Schema Element Restrictions
With the exception of :db/doc
and :db/ident
, names in the :db
namespace and all :db.*
namespaces are reserved for use in Datomic
schema. Domain entities cannot use these names.