This document outlines limitations of HarperDB.
Schema Naming Restrictions
HarperDB schema metadata (schema names, table names, and attribute/column names) are case sensitive. Meaning schemas, tables, and attributes can differ only by the case of their characters.
Restrictions on Schema Metadata Names
HarperDB schema metadata (schema names, table names, and attribute names) cannot contain the following UTF-8 characters:
Additionally, they cannot contain the first 31 non-printing characters. Spaces are allowed, but not recommended as best practice. The regular expression used to verify a name is valid is:
HarperDB 2.3.1 and up limits tables to 10,000 attributes. For 2.3.0 and below, the limit is 1,000 attributes.