Hash Index

The hash index provides O(1) point lookups by user-defined key. It is the primary index for KV collections.

How It Works

Keys are hashed to locate the value directly — no tree traversal. This provides constant-time reads regardless of collection size.

Creating a KV Collection

CREATE COLLECTION sessions TYPE KEY_VALUE (key TEXT PRIMARY KEY);

The PRIMARY KEY column is automatically hash-indexed.

Secondary Indexes

KV collections can also have secondary B-tree indexes on value fields:

CREATE INDEX ON sessions FIELDS role;
SELECT key, user_id FROM sessions WHERE role = 'admin';

TTL

Native TTL with an index-backed expiry wheel. Keys expire automatically:

INSERT INTO sessions { key: 'sess_abc', user_id: 'alice', ttl: 3600 };