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- DuckLake 12668
- DuckLake 1.1 was released together with DuckDB 2.0. Read the announcement blog post . The ducklake extension adds support for attaching to databases stored in the DuckLake format . The complete documentation of this extension is available a
...ype Description snapshot_id BIGINT rowid BIGINT change_type VARCHAR The type of change: insert or delete Commands ducklake_cleanup_old_files The ducklake_cleanup_old_files function cleans up old files in the DuckLake denoted by catalog . It returns a ta...eleted (or, with dry_run , would be deleted). Parameter name Parameter type Named parameter Description catalog VARCHAR no cleanup_all BOOLEAN yes dry_run BOOLEAN yes older_than TIMESTAMP WITH TIME ZONE yes ducklake_expire_snapshots The ducklake_expire_... - https://man.mtool.work/duckdb/2.0/core_extensions/ducklake.html
- Configuration 10960
- Configuration options can be provided to change different settings of the database system. Note that many of these settings can be changed later on using PRAGMA statements as well. The configuration object should be created, filled with val
...n the database using the configuration if (duckdb_open_ext(NULL, &db, config, NULL) == DuckDBError) { // handle error } // cleanup the configuration object duckdb_destroy_config(&config); // run queries... // cleanup duckdb_close(&db); API Reference Ove... - https://man.mtool.work/duckdb/2.0/clients/c/config.html
- Graph Queries 8669
- DuckDB supports graph queries via the DuckPGQ community extension , which implements the SQL/PGQ syntax from the SQL:2023 standard. Warning DuckPGQ is a community extension and is still under active development. It may not be available for
...ng Financial Crime with DuckDB and Graph Queries" blog post for a detailed example of detecting money laundering patterns. Cleanup To remove a property graph: DROP PROPERTY GRAPH social_network; Further Reading DuckPGQ Documentation DuckPGQ Community Ex... - https://man.mtool.work/duckdb/2.0/guides/sql_features/graph_queries.html
- Unit Tester Configuration 8106
- There are three ways of setting options for the unit tester: Command Line Arguments Configuration File Environment Variables Configuration Options List See the Configuration Options List for the full list of available options. Command Line
...s to be used by the test runner itself (for e.g. concurrent loop) --max-threads <num> Max threads to use during tests --on-cleanup <string> SQL statements to execute on test end --on-init <string> SQL statements to execute on init --on-load <string> SQL... - https://man.mtool.work/duckdb/2.0/dev/sqllogictest/test_configuration.html
- Startup & Shutdown 7815
- To use DuckDB, you must first initialize a duckdb_database handle using duckdb_open() . duckdb_open() takes as parameter the database file to read and write from. The special value NULL ( nullptr ) can be used to create an in-memory databas
...== DuckDBError) { // handle error } if (duckdb_connect(db, &con) == DuckDBError) { // handle error } // run queries... // cleanup duckdb_disconnect(&con); duckdb_close(&db); API Reference Overview duckdb_instance_cache duckdb_create_instance_cache ();... - https://man.mtool.work/duckdb/2.0/clients/c/connect.html
- Catalogs 7815
- 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
...t that does not support staged creates, rejects the transactions/commit endpoint, and manages its own metadata and storage cleanup: ATTACH '⟨warehouse⟩' AS horizon_catalog ( TYPE iceberg, URI '⟨catalog_endpoint⟩', STAGE_CREATE_TABLES false, DISABLE_MULT... - https://man.mtool.work/duckdb/2.0/core_extensions/iceberg/catalogs.html
- Write User Defined Functions 7524
- Overview The JDBC driver can register user-defined functions (UDFs) written in Java, including scalar functions and table functions. This page covers building and registering both, from the simple functional-interface overloads to the vecto
...} DuckDB calls close() after the function is exhausted, after a LIMIT , or on an error, cancellation, or early JDBC close. Cleanup may run on native worker threads with no ordering guarantees, so close() should be fast, idempotent, and thread-safe. It m... - https://man.mtool.work/duckdb/2.0/clients/java/functions.html
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