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- Transaction Management 13043
- DuckDB supports ACID database transactions . Transactions provide isolation, i.e., changes made by a transaction are not visible from concurrent transactions until it is committed. A transaction can also be aborted, which discards any chang
...he following statements for transaction management. Starting a Transaction To start a transaction, run: BEGIN TRANSACTION; Committing a Transaction You can commit a transaction to make it visible to other transactions and to write it to persistent stor...age (if using DuckDB in persistent mode). To commit a transaction, run: COMMIT; If you are not in an active transaction, the COMMIT statement will fail. Rolling Back a Transa...ultiple SQL statements are submitted together (e.g., separated by semicolons), they are executed one after another in auto-commit mode: each statement that succeeds is committed immediately, and execution stops at the first statement that fails. Statem... - https://man.mtool.work/duckdb/2.0/sql/statements/transactions.html
- Building Configuration 10957
- Build Types DuckDB can be built in many different settings, most of these correspond directly to CMake but not all of them. release This build has been stripped of all the assertions and debug symbols and code, optimized for performance. de
...ul when building from sources that are not part of a complete Git repository (e.g., an archive file with no information on commit hashes and tags). For example: OVERRIDE_GIT_DESCRIBE=v0.10.0-843-g09ea97d0a9 GEN=ninja make Will result in the following o...hout Git Git and Python are optional dependencies for building DuckDB from source. DuckDB normally derives its version and commit hash from Git, so OVERRIDE_GIT_DESCRIBE is primarily useful when building from sources that are not a complete Git checkou...t. The version and commit hash are resolved as follows: If OVERRIDE_GIT_DESCRIBE is set to a full git describe --tags --long string (for example, v1... - https://man.mtool.work/duckdb/2.0/dev/building/build_configuration.html
- Python 10604
- The DuckDB Python package has its own repository at duckdb/duckdb-python and uses nanobind 3 to create Python bindings with DuckDB. Prerequisites This guide assumes: You have a full clone of the DuckDB Python package source, including its g
...not initialized * The package version is the release_version in pyproject.toml followed by .dev and the time of the latest commit across the repository and the submodule, as yymmddhhmm in UTC, for example 2.0.0.dev2610201323 . No git tags are read. The...DuckDB version is computed from the number of commits in the submodule, so do not make a shallow clone 2. Install Astral uv Install uv version >= 0.8.0. Development Environmen...irectories * Installing dependencies first, then building without isolation ensures proper cmake integration 3. Enable Pre-Commit Hooks We run a number of linting, formatting and type-checking in CI. You can run all of these manually, but to make your... - https://man.mtool.work/duckdb/2.0/dev/building/python.html
- INSERT Statements 10508
- INSERT statements are the standard way of loading data into a relational database. When using INSERT statements, the values are supplied row-by-row. While simple, there is significant overhead involved in parsing and processing individual I
...s inserted per statement. If you must use INSERT statements to load data in a loop, avoid executing the statements in auto-commit mode. After every commit, the database is required to sync the changes made to disk to ensure no data is lost. In auto-com...gram. Tip If you absolutely must use INSERT statements in a loop to load data, wrap them in calls to BEGIN TRANSACTION and COMMIT . Syntax An example of using INSERT INTO to load data in a table is as follows: CREATE TABLE people (id INTEGER, name VARC... - https://man.mtool.work/duckdb/2.0/data/insert.html
- ODBC Extension 10428
- Please note that DuckDB also offers an ODBC client , which allows you to connect to DuckDB via ODBC from other applications. The odbc_scanner extension allows connecting to other databases (using their ODBC drivers ) and run queries with th
...ORCE INSTALL 'http://nightly-extensions.duckdb.org/v1.2.0/⟨platform⟩/odbc_scanner.duckdb_extension.gz'; Installed version (commit ID) can be checked using the following query: FROM duckdb_extensions() WHERE extension_name = 'odbc_scanner'; To install a...version built from a specific commit run: FORCE INSTALL 'http://nightly-extensions.duckdb.org/odbc_scanner/⟨7_character_commit_id⟩/v1.2.0/⟨platform⟩/odbc_scann...B option to 1 . Transaction Management According to ODBC specification, connections to remote DB are expected to have auto-commit mode enabled by default. As a general rule, transaction commands BEGIN TRANSACTION / COMMIT / ROLLBACK are not supposed to... - https://man.mtool.work/duckdb/2.0/core_extensions/odbc/overview.html
- Import Data 10155
- Overview The Rust client offers two ways to get data into DuckDB in bulk: the high-performance Appender for inserting rows from Rust, and reading directly from data files such as Parquet, CSV, and JSON. Both are described below. Appender Th
...ate the appender there. Appending Inside a Transaction For a large load, wrapping the appends in a transaction lets DuckDB commit them as a single unit. Begin a transaction with Connection::transaction() , set it to commit on drop, and create the appen...e TINYINT NOT NULL)", )?; let row_count = 10_000_000; { let mut tx = db.transaction()?; tx.set_drop_behavior(DropBehavior::Commit); let mut app = tx.appender("test")?; for i in 0..row_count { app.append_row(params![i, "123456", 15, 1])?; } } // the app...ender flushes and the transaction commits here, on drop let count = db.query_row("SELECT count(*) FROM test", [], |row| row.get::<_, i64>(0))?; assert_eq!(count, r... - https://man.mtool.work/duckdb/2.0/clients/rust/data_import.html
- ODBC Extension Functions 9513
- odbc_begin_transaction odbc_bind_params odbc_close odbc_commit odbc_connect odbc_copy odbc_create_params odbc_list_data_sources odbc_list_drivers odbc_query odbc_rollback odbc_begin_transaction odbc_begin_transaction(conn_handle BIGINT) ->
...VARCHAR Sets the SQL_ATTR_AUTOCOMMIT attribute to SQL_AUTOCOMMIT_OFF on the specified connection thus effectively starting an implicit transaction. odbc_commit...e created with odbc_connect Returns: Always returns NULL ( VARCHAR ). Example: SELECT odbc_close(getvariable('conn')) odbc_commit odbc_commit(conn_handle BIGINT) -> VARCHAR Calls SQLEndTran with SQL_COMMIT argument on the specified connection, completi...BIGINT ): ODBC connection handle created with odbc_connect Returns: Always returns NULL ( VARCHAR ). Example: SELECT odbc_commit(getvariable('conn')) odbc_connect odbc_connect(conn_string VARCHAR) -> BIGINT odbc_connect(conn_string VARCHAR, username V... - https://man.mtool.work/duckdb/2.0/core_extensions/odbc/functions.html
- DuckLake 8807
- 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
...──────┬─────────┬────────────────┬───────────────────┐ │ snapshot_id │ snapshot_time │ schema_version │ changes │ author │ commit_message │ commit_extra_info │ │ int64 │ timestamp with time zone │ int64 │ map(varchar, varchar[]) │ varchar │ varchar │ v...shot_id BIGINT snapshot_time TIMESTAMP WITH TIME ZONE schema_version BIGINT changes MAP(VARCHAR, VARCHAR[]) author VARCHAR commit_message VARCHAR commit_extra_info VARCHAR ducklake_table_info The ducklake_table_info function returns information on the... - https://man.mtool.work/duckdb/2.0/core_extensions/ducklake.html
- Azure Extension 8262
- The azure extension lets DuckDB read and write files in Azure Blob Storage and Azure Data Lake Storage (ADLS) Gen2. Installing and Loading The azure extension will be transparently autoloaded on first use from the official extension reposit
...ata locally and uploads it in blocks of azure_write_block_size bytes (default: 8 MiB). By default, the uploaded blocks are committed when the file is closed, so other readers see the new content only after the write completes. To commit earlier, set az...ure_write_staged_blocks_per_commit to the number of blocks after which an intermediate commit happens. Warning An intermediate commit makes an incomplete fil...ault. The maximum is 4000 MiB (about 3.9 GiB). See Writing Large Files . UBIGINT 8*1024*1024 azure_write_staged_blocks_per_commit Number of uploaded blocks after which an intermediate commit happens. With 0 , all blocks are committed when the file is c... - https://man.mtool.work/duckdb/2.0/core_extensions/azure.html
- Analyzing a Git Repository 8262
- You can use DuckDB to analyze Git logs using the output of the git log command . Exporting the Git Log We start by picking a character that doesn't occur in any part of the commit log (author names, messages, etc). Since version v1.2.0, Duc
...?Read support for Parquet Float16 Loading the Git Log into DuckDB Start DuckDB and read the log as a CSV ?SV: CREATE TABLE commits AS FROM read_csv( 'git-log.csv', delim = '?', header = false, column_names = ['timestamp', 'hash', 'author', 'message'] )...; This will result in a nice DuckDB table: FROM commits LIMIT 5; ┌──────────────────────────┬────────────┬──────────────────┬────────────────────────────────────────────────────...any other in DuckDB. Common Topics Let's start with a simple question: which topic was the most commonly mentioned in the commit messages: CI, CLI, or Python? SELECT message.lower().regexp_extract('\b(ci|cli|python)\b') AS topic, count(*) AS num_commi... - https://man.mtool.work/duckdb/2.0/guides/snippets/analyze_git_repository.html
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