# Fabric LH (Spark) vendor-specific interface · access · 2026

Revision 1 (11 October 2026) · Modeled snapshot · through 8 October 2026.

All figures are research-informed estimates of analytical activity. Significant errors may remain; decimal places do not imply measurement precision.

0.415% of the full access layer.

[Fabric LH (Spark) vendor-specific interface](https://history.columnar.tech/technologies/access/vendor-fabric.md): historical names and annual shares.

Fabric Spark workloads only. Warehouse and Lakehouse SQL endpoint execution is included in the SQL Server family. The pooled Fabric workload is estimated as 50% SQL and 50% Spark.

Connections below describe the whole Fabric LH (Spark) engine. Access and storage mixes are estimated separately; they are not a joint interface-to-storage distribution.

## Access use within this engine

| Option | Share of engine activity | Share of full access layer |
| --- | --- | --- |
| [JDBC](https://history.columnar.tech/technologies/access/jdbc.md) | 30.2% | 0.5% |
| [Fabric LH (Spark) vendor-specific interface](https://history.columnar.tech/technologies/access/vendor-fabric.md) | 27.7% | 0.4% |
| [Other language/portable APIs](https://history.columnar.tech/technologies/access/other-api.md) | 20.3% | 0.3% |
| [ODBC](https://history.columnar.tech/technologies/access/odbc.md) | 14.8% | 0.2% |
| [Python DB-API (other drivers)](https://history.columnar.tech/technologies/access/python.md) | 7% | 0.1% |

## Storage use within this engine

| Option | Share of engine activity | Share of full storage layer |
| --- | --- | --- |
| [Delta-authoritative tables](https://history.columnar.tech/technologies/storage/delta.md) | 72.8% | 1.1% |
| [Standalone Parquet on object storage](https://history.columnar.tech/technologies/storage/parquet-object.md) | 16% | 0.2% |
| [Iceberg-authoritative tables](https://history.columnar.tech/technologies/storage/iceberg.md) | 7.2% | 0.1% |
| [Object-store CSV/text/Avro](https://history.columnar.tech/technologies/storage/object-row.md) | 4% | <0.1% |

[All percentages for 2026](https://history.columnar.tech/years/2026.md)

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