Harper Limits
This document outlines limitations of Harper.
Database Naming Restrictions
Case Sensitivity
Harper database metadata (database names, table names, and attribute/column names) are case sensitive. Meaning databases, tables, and attributes can differ only by the case of their characters.
Restrictions on Database Metadata Names
Harper database metadata (database 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:
Table Limitations
Attribute Maximum
Harper limits the number of total indexed attributes across tables (including the primary key of each table) to 10,000 per database.
Primary Keys
The maximum length of a primary key is 1978 bytes or 659 characters (whichever is shortest).
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