# ADBC · access · 2023

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.

0.0375% of the full access layer.

[ADBC](https://history.columnar.tech/technologies/access/adbc.md): historical names and annual shares.

## Management within ADBC

Unmanaged means customer-managed; managed means vendor-managed access. These are subdivisions of the parent, with no separate engine connections.

| Subdivision | Share of parent | Share of full access layer |
| --- | --- | --- |
| Unmanaged | 100% | 0.0375% |
| Managed | 0% | 0% |

Direct Arrow and ADBC are exclusive boxes. Together they form an Arrow family of 1.8% of access.

## Contributions by compute engine

Each figure is a share of the full access layer.

| Engine | Share of full access layer | Engine connections |
| --- | --- | --- |
| [Snowflake](https://history.columnar.tech/technologies/compute/snowflake.md) | <0.1% | [Inspect engine](https://history.columnar.tech/connections/2023/compute/snowflake.md) |
| [PostgreSQL family](https://history.columnar.tech/technologies/compute/postgres.md) | <0.1% | [Inspect engine](https://history.columnar.tech/connections/2023/compute/postgres.md) |
| [Dremio](https://history.columnar.tech/technologies/compute/dremio.md) | <0.1% | [Inspect engine](https://history.columnar.tech/connections/2023/compute/dremio.md) |
| [DuckDB](https://history.columnar.tech/technologies/compute/duckdb.md) | <0.1% | [Inspect engine](https://history.columnar.tech/connections/2023/compute/duckdb.md) |
| [SQLite](https://history.columnar.tech/technologies/compute/sqlite.md) | <0.1% | [Inspect engine](https://history.columnar.tech/connections/2023/compute/sqlite.md) |

[All percentages for 2023](https://history.columnar.tech/years/2023.md)

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