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- Glossary of Terms 14450
- This page contains a glossary of a few common terms used in DuckDB. Terms In-Process Database Management System The DBMS runs in the client application's process instead of running as a separate process, which is common in the traditional c
...lient–server setup. An alternative term is embeddable database management system. In general, the term “embedded database management system” should be avoided, as it can be confused with DBMSs targeting embedded systems (which run on e... - https://man.mtool.work/duckdb/2.0/guides/glossary.html
- Iceberg Options 9109
- This page lists the options of the iceberg extension: the parameters accepted by the Iceberg functions , the options of the ATTACH and CREATE SECRET statements used to connect to a catalog , and the global settings. ATTACH Options To make a
...m the file at the metadata-location returned by the catalog and treats it as authoritative, rather than using the metadata embedded in the catalog's response. Useful when the embedded metadata omits properties such as schema.name-mapping.default . Some p... - https://man.mtool.work/duckdb/2.0/core_extensions/iceberg/iceberg_options.html
- Avro Extension 8773
- The avro extension enables DuckDB to read Apache Avro files. The avro extension was released as a community extension in late 2024 and became a core extension in early 2025. The read_avro Function The extension adds a single DuckDB function
...rs to provide a separate Avro schema file. This is unlikely to change, all Avro files we have seen so far had their schema embedded. There is currently no support for the union_by_name flag that other readers in DuckDB support. This is planned for the fu... - https://man.mtool.work/duckdb/2.0/core_extensions/avro.html
- UI Extension 8773
- The ui extension adds a user interface for your local DuckDB instance. Usage To start the UI from the command line: duckdb -ui To start the UI from SQL: CALL start_ui(); Running either of these will open the UI in your default browser. The
...all cores, memory and files. Closing this instance will cause the UI to stop working. The UI is served from an HTTP server embedded in DuckDB. To start this server without launching the browser, run: CALL start_ui_server(); You can then load the UI in yo... - https://man.mtool.work/duckdb/2.0/core_extensions/ui.html
- Variant Type 8773
- The VARIANT type stores typed, binary data where each row is self-contained with its own type information. This differs from the JSON type , which is physically stored as text. Because type metadata is embedded per-value, VARIANT provides b
... - https://man.mtool.work/duckdb/2.0/sql/data_types/variant.html
- Troubleshoot 8454
- Overview This page collects common issues encountered when using the DuckDB JDBC driver, together with their workarounds. If you run into a problem that is not covered here, search the driver's issue tracker on GitHub. Driver Class Not Foun
...FileNotFoundException: DuckDB JNI library not found, path: '⟨path⟩/libduckdb_java.⟨suffix⟩' The shared library was neither embedded in the executable nor found next to it. Either add a resource entry for your platform's library or place the library file... - https://man.mtool.work/duckdb/2.0/clients/java/troubleshoot.html
- DuckDB Wasm Client 8454
- Installation To use the DuckDB Wasm client, visit the duckdb-wasm GitHub repository . The latest stable version of the DuckDB WebAssembly client is 2.0.0. DuckDB-Wasm is a version of DuckDB that has been compiled to WebAssembly , the portab
...with no server to send queries to and no data leaving the user's machine. It offers a layered API to fit different needs: embedded as a JavaScript + WebAssembly library used as a Web shell built from source This page covers installation and basic usage;... - https://man.mtool.work/duckdb/2.0/clients/wasm/overview.html
- Tableau – A Data Visualization Tool 8454
- Tableau is a popular commercial data visualization tool. In addition to a large number of built-in connectors, it also provides generic database connectivity via ODBC and JDBC connectors. Tableau has two main versions: Desktop and Online (S
...erver). For Desktop, connecting to a DuckDB database is similar to working in an embedded environment like Python. For Online, since DuckDB is in-process, the data needs to be either on the server itself or in a... - https://man.mtool.work/duckdb/2.0/guides/data_viewers/tableau.html
- Deploy 8118
- Overview Deploying DuckDB-Wasm means serving its components so that the browser can fetch and instantiate them. This page describes each component a deployment needs to serve, how the worker and WebAssembly variants relate, how extensions a
...rigin resource it embeds to explicitly opt in. Because many third-party endpoints do not yet send the headers needed to be embedded under these policies, most deployments run on non-isolated pages, where DuckDB-Wasm falls back to the single-threaded mvp... - https://man.mtool.work/duckdb/2.0/clients/wasm/deploying_duckdb_wasm.html
- Catalogs 7782
- The iceberg extension supports attaching Iceberg REST Catalogs. Attaching a catalog is required for writing to Iceberg . Before attaching an Iceberg REST Catalog, you must install the iceberg extension by following the instructions located
...url⟩', SECRET '⟨lakekeeper_secret⟩' ); SeaweedFS SeaweedFS table buckets provide both halves of an Iceberg deployment: the embedded Iceberg REST Catalog serves the table metadata, and the table bucket stores the table data as Parquet files behind the sam... - https://man.mtool.work/duckdb/2.0/core_extensions/iceberg/catalogs.html
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