# ClickHouse vendor-specific interface · access · 2021

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.

0.88% of the full access layer.

[ClickHouse vendor-specific interface](https://history.columnar.tech/technologies/access/vendor-clickhouse.md): historical names and annual shares.

Connections below describe the whole ClickHouse 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 |
| --- | --- | --- |
| [ClickHouse vendor-specific interface](https://history.columnar.tech/technologies/access/vendor-clickhouse.md) | 51.8% | 0.9% |
| [JDBC](https://history.columnar.tech/technologies/access/jdbc.md) | 17.5% | 0.3% |
| [Other language/portable APIs](https://history.columnar.tech/technologies/access/other-api.md) | 9.9% | 0.2% |
| [Python DB-API (other drivers)](https://history.columnar.tech/technologies/access/python.md) | 9.9% | 0.2% |
| [ODBC](https://history.columnar.tech/technologies/access/odbc.md) | 9.7% | 0.2% |
| [Arrow without ADBC](https://history.columnar.tech/technologies/access/arrow.md) | 1.3% | <0.1% |

## Storage use within this engine

| Option | Share of engine activity | Share of full storage layer |
| --- | --- | --- |
| [ClickHouse native storage](https://history.columnar.tech/technologies/storage/native-clickhouse.md) | 94% | 1.6% |
| [Standalone Parquet on object storage](https://history.columnar.tech/technologies/storage/parquet-object.md) | 1.9% | <0.1% |
| [Local/shared row files](https://history.columnar.tech/technologies/storage/legacy-local.md) | 1% | <0.1% |
| [Object-store CSV/text/Avro](https://history.columnar.tech/technologies/storage/object-row.md) | 1% | <0.1% |
| [Standalone Parquet on local/shared filesystems](https://history.columnar.tech/technologies/storage/parquet-local.md) | 1% | <0.1% |
| [Federated relational native stores (vendor unallocated)](https://history.columnar.tech/technologies/storage/remote-relational.md) | 1% | <0.1% |

[All percentages for 2021](https://history.columnar.tech/years/2021.md)

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