Documentation Index
Fetch the complete documentation index at: https://docs.helix-db.com/llms.txt
Use this file to discover all available pages before exploring further.
For the complete documentation index optimized for AI agents, see llms.txt.
Current constraints and practical limits. These reflect the current implementation, not
fundamental architectural boundaries.
Data Model
| Limit | Value |
|---|
| Node and edge ID range | 64-bit unsigned integer (max 2^63) |
| Property value types | boolean, integer, float, string, bytes, and array variants |
| Nested structures | Not supported. Properties are flat key-value pairs. |
| Reserved property keys | $label (used for label-based filtering and label-scoped secondary, vector, and text indexes) |
Vector Indexes
| Limit | Value |
|---|
| Scope | Node and edge properties |
| Supported property types | Numeric array properties (float32[], float64[], int64[]) normalized to float32 for indexing |
| Tenant partitioning | Optional by configured tenant property name. Tenant-scoped searches require a tenant value. Unknown tenant partitions return no results. |
| Dimension matching | Vectors must exactly match the configured index dimension |
| Distance metrics | cosine, euclidean, manhattan |
| Search type | Approximate nearest neighbor (ANN) |
Text Indexes
| Limit | Value |
|---|
| Scope | Node and edge properties |
| Supported property types | String and StringArray |
| Unsupported values | null and non-string values are rejected |
| Analyzer config | Preset analyzers: standard, standard_stem_en, whitespace_lowercase |
| Term positions | Optional |
| Tenant partitioning | Optional. Tenant-partitioned text indexes currently require the partition property name to be tenant_id, and tenant-scoped searches require a tenant value. |
Secondary Indexes
| Limit | Value |
|---|
| Equality indexes | Supported on node and edge properties |
| Range indexes | Supported on numeric and string properties |
| Encoding | Range indexes use lexicographic string encoding. Values must be encoded consistently for correct ordering. |
Queries
| Limit | Value |
|---|
| Query model | Stored procedures and runtime queries |
| Query language | Rust DSL |
| Transaction scope | One transaction per query invocation |
