This document outlines limitations of HarperDB.
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 limits number of attributes to 10,000 per table.