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- Iceberg Functions 12785
- The iceberg extension provides the following functions: Function Description iceberg_scan(source) Reads an Iceberg table from a path. iceberg_metadata(source) Returns the manifest entries of an Iceberg table. iceberg_snapshots(source) Retur
...berg table. iceberg_partition_stats(source) Returns per-partition-field statistics of an Iceberg table. iceberg_load_table_response(table) Returns the raw LoadTable response of the REST Catalog. iceberg_files(source) Returns the data and delete files of...Returns the scan tasks (files to read) planned for an Iceberg table. iceberg_view_metadata(view) Returns the raw LoadView response of the REST Catalog. iceberg_table_properties(table) Returns all properties of the specified table. set_iceberg_table_prop...transform , lower_bound and upper_bound . SELECT * FROM iceberg_partition_stats(my_datalake.default.t); iceberg_load_table_response The iceberg_load_table_response function is an advanced function that only works with an attached Iceberg REST Catalog . I... - https://man.mtool.work/duckdb/2.0/core_extensions/iceberg/iceberg_functions.html
- Reference 12322
- This page lists the functions, settings, and log types exposed by the quack extension . For a tour of the protocol, start with the Overview . Function Reference Server Management Function Description quack_serve(⟨listen_uri⟩, ...) Start a s
...d). Batches are cut when they reach this size. quack_prepare_inline_rows UBIGINT 24576 Rows returned inline in the PREPARE response before the remainder is left to FETCH . Drains whole batches, so it may overshoot to a batch boundary. quack_fetch_read_ah...n_id query_id thread_id timestamp type log_level message_type quack_connection_id client_query_id query server duration_ms response_type error 60 CONNECTION 2 18 18 NULL 2026-05-10 09:06:19.841623+02 Quack DEBUG CONNECTION_REQUEST 18 NULL http://localhos...t:9494 41 CONNECTION_RESPONSE NULL 60 CONNECTION 2 18 18 NULL 2026-05-10 09:06:19.842407+02 Quack DEBUG PREPARE_REQUEST 091A003553E7E67B615B73D6BE81FD2E... - https://man.mtool.work/duckdb/2.0/quack/reference.html
- Import Data 8837
- Overview DuckDB-Wasm has multiple ways to import data, depending on the format of the data. Importing happens in two steps. The data file is registered in a virtual file system using one of the register functions ( registerFileBuffer , regi
...(arrowTable, { name: 'arrow_table' }); To insert data that arrives as a raw Arrow IPC stream — for example, from a fetch() response — read each chunk and pass it to insertArrowFromIPCStream() , then write the end-of-stream (EOS) marker to signal that the...g/docs/format/Columnar.html#ipc-streaming-format const EOS = new Uint8Array([255, 255, 255, 255, 0, 0, 0, 0]); const streamResponse = await fetch(`someapi`); const streamReader = streamResponse.body.getReader(); const streamInserts = []; while (true) { c...nt)); await conn.insertJSONFromPath('columns.json', { name: 'columns' }); To import JSON fetched from an API, register the response bytes as a file buffer: const streamResponse = await fetch(`someapi/content.json`); await db.registerFileBuffer('file.json... - https://man.mtool.work/duckdb/2.0/clients/wasm/data_ingestion.html
- Quack Remote Protocol 8535
- The Quack extension turns a DuckDB instance into a server that other DuckDB instances (clients) can connect to over HTTP. This page covers the protocol at a glance and walks through basic usage on both sides of the wire. For the full list o
...c the same way they handle any other HTTP service. There is no custom wire transport to operate. Client-driven request and response. Every interaction is initiated by the client. The server does not initiate interactions via pushing. application/duckdb s...erialization. Requests and responses are encoded with DuckDB's internal serialization primitives (the same code path used by the Write-Ahead Log ). This avoid...sless across the wire. Single round-trip per query. After the initial connection handshake, a query needs only one request–response pair. Large results stream back in chunks via follow-up FETCH requests, optionally parallelized on multiple threads. Defau... - https://man.mtool.work/duckdb/2.0/quack/overview.html
- Tuning Workloads 8393
- DuckDB aims to perform well out of the box, so most workloads do not require any tuning. When tuning is worthwhile, there is no single configuration or magic number that is optimal for every workload: the right settings depend on what you a
...rnal file cache, run: FROM duckdb_external_file_cache(); The external file cache follows the Cache-Control headers of HTTP responses: data from a response marked no-store , no-cache or private , or from a response that is already stale (e.g., max-age=0 )... - https://man.mtool.work/duckdb/2.0/guides/performance/how_to_tune_workloads.html
- Iceberg Options 8232
- 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
...lue use it to encode a warehouse or account/catalog identifier. It is normally discovered from the catalog's configuration response; set it explicitly to override. A prefix containing / is split into path components unless ENCODE_ENTIRE_PREFIX is set. NA...-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 parameters enable others, s... - https://man.mtool.work/duckdb/2.0/core_extensions/iceberg/iceberg_options.html
- CREATE TRIGGER Statement 7930
- New The CREATE TRIGGER feature was introduced in DuckDB 2.0. The CREATE TRIGGER statement registers a trigger: a set of SQL statements that run automatically in response to INSERT , UPDATE , or DELETE events on a table. Examples Record ever
... - https://man.mtool.work/duckdb/2.0/sql/statements/create_trigger.html
- What's New in the Docs for 2.0 7930
- This page tracks the documentation for the features introduced in DuckDB 2.0, organized around the themes of the DuckDB 2.0.0 release announcement . Each section links to the relevant documentation. DuckDB as a Server: Quack and CONNECT Sin
...values. Variant type Variant functions Triggers DuckDB 2.0 added trigger support, so you can run actions automatically in response to table changes. This is useful for building audit tables and enforcing invariants. CREATE TRIGGER statement SQL Dialect... - https://man.mtool.work/duckdb/2.0/whats_new_in_the_docs.html
- Logging 7628
- DuckDB implements a logging mechanism that provides users with detailed information about events such as query execution, performance metrics and system events. Warning Logs may contain sensitive information, including secrets and credentia
...th VARCHAR , op VARCHAR , bytes BIGINT , pos BIGINT HTTP request STRUCT(type, url, start_time, duration_ms, headers MAP) , response STRUCT(status, reason, headers MAP) PhysicalOperator operator_type VARCHAR , parameters MAP(VARCHAR, VARCHAR) , class VARC... - https://man.mtool.work/duckdb/2.0/operations_manual/logging/overview.html
- Migrating to DuckDB 2.0 7628
- DuckDB 2.0.0 is packed with new features and performance improvements, including query optimization and asynchronous I/O. It also ships a small set of breaking changes, most notably a new default storage format, which DuckDB versions before
...k extension and the CONNECT statement The VARIANT type for semi-structured data Triggers that run actions automatically in response to table changes SQL dialect additions, including data-modifying CTEs and nested schemas Asynchronous I/O for faster reads... - https://man.mtool.work/duckdb/2.0/operations_manual/migration.html
DuckDB 2.0 Documentation / man.mtool.work