Glossary

This glossary establishes the terminology used throughout the manual. It does not define the complete storage or transaction contract.

Term	Meaning
Database root	Directory containing the persistent state of a database.
Catalog	Database metadata describing objects such as tables and indexes.
Transaction	A unit of work with a defined commit or rollback boundary.
MVCC	Multiversion concurrency control; readers observe versions according to visibility rules.
WAL	Write-ahead log used by the engine’s durability and recovery procedures.
Checkpoint	A recovery boundary whose exact meaning is defined by the storage contract.
Cache budget	A configured bound for a cache, not a bound on total process memory.
RSS	Resident set size: the process memory currently resident in physical memory.
Foreign key (FK)	A relationship constrained by a reference to a key in another or the same table.
Navigable reference	RadixDB query notation for following declared relationships.
ORM	Object-relational mapping: an application interface relating records and database operations.
ACL	Access control list; the object privilege model described by the security chapters.
Invoker / definer	The caller or owner context used to evaluate routine permissions.
Accepted	Behavior verified by the implementation’s acceptance checks, not merely described in a plan.

SQL keywords, configuration keys and API identifiers are not translated. Specific limits, isolation rules and security guarantees belong to their respective chapters rather than these short definitions.