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- Transaction Management 13604
- 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
...(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. Statements that ran before the failing one are not rol...Ada'; INSERT INTO person VALUES ('Bruce', 39); ROLLBACK; SELECT * FROM person; The first transaction (inserting “Ada”) was committed but the second (deleting “Ada” and inserting “Bruce”) was aborted. Therefore, the resulting table will only contain <'Ada'... - https://man.mtool.work/duckdb/2.0/sql/statements/transactions.html
- ALTER VIEW Statement 10225
- The ALTER VIEW statement changes the schema of an existing view in the catalog. Examples Rename a view: ALTER VIEW view1 RENAME TO view2; ALTER VIEW changes the schema of an existing view. All the changes made by ALTER VIEW fully respect th
...e transactional semantics, i.e., they will not be visible to other transactions until committed, and can be fully reverted through a rollback. Note that other views that rely on the view are not automatically updated.... - https://man.mtool.work/duckdb/2.0/sql/statements/alter_view.html
- Delta Extension 9385
- The delta extension adds support for the Delta Lake open-source storage format . It is built using the Delta Kernel . The extension reads Delta tables, local and remote, and writes them: it can create tables and append to them. For implemen
...table; an AT clause overrides it. A version and a timestamp cannot be given together. A timestamp reads the latest version committed at or before it. One later than now() or earlier than the table's first commit fails. A timestamp without a time zone uses...n_version('my_table', 'my_app_id', 1::UBIGINT, NULL::UBIGINT); INSERT INTO my_table VALUES (1); COMMIT; If another process committed a different version for my_app_id first, COMMIT fails. A rolled-back transaction leaves the version unchanged. Read the cu...for every later query. Without it, each transaction reads the latest version; since v1.5.3, it loads only the log entries committed since the previous read. PUSHDOWN_PARTITION_INFO BOOLEAN true Push down partition information so that whole files can be s... - https://man.mtool.work/duckdb/2.0/core_extensions/delta.html
- Multiple Connections 8974
- For tests whose purpose is to verify that the transactional management or versioning of data works correctly, it is generally necessary to use multiple connections. For example, if we want to verify that the creation of tables is correctly
...transaction and create a table in con1 , then fire a query in con2 that checks that the table is not accessible yet until committed. We can use multiple connections in the sqllogictests using connection labels . The connection label can be optionally app... - https://man.mtool.work/duckdb/2.0/dev/sqllogictest/multiple_connections.html
- PostgreSQL Extension 8545
- The postgres extension allows DuckDB to directly read and write data from a running PostgreSQL database instance. The data can be queried directly from the underlying PostgreSQL database. Data can be loaded from PostgreSQL tables into DuckD
...s, SCHEMA 'public'); The transaction isolation level can be set with the ISOLATION_LEVEL option. Supported values are READ COMMITTED , REPEATABLE READ , and SERIALIZABLE ; the default is REPEATABLE READ . ATTACH 'dbname=postgres user=postgres host=127.0.0....1' AS db (TYPE postgres, ISOLATION_LEVEL 'READ COMMITTED'); Warning Avoid including credentials, such as a password, directly in the connection string. If a connection error occur... - https://man.mtool.work/duckdb/2.0/core_extensions/postgres/overview.html
- Azure Extension 8348
- 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 azure...ite_staged_blocks_per_commit Number of uploaded blocks after which an intermediate commit happens. With 0 , all blocks are committed when the file is closed. Non-zero values make partial writes visible sooner, at the cost of extra requests. This option do... - https://man.mtool.work/duckdb/2.0/core_extensions/azure.html
- Unity Catalog Extension 7705
- The unity_catalog extension attaches a Unity Catalog catalog, on Databricks or Unity Catalog OSS, as a DuckDB database. You can list, read, insert into and create its Delta Lake tables. It uses the delta extension to access the tables. For
...my_catalog.my_schema.my_table AT (TIMESTAMP => TIMESTAMPTZ '2026-10-01 12:00:00+00'); A timestamp reads the latest version committed at or before that time. A timestamp before the table's first commit or later than the current time fails with an error. Wr... - https://man.mtool.work/duckdb/2.0/core_extensions/unity_catalog.html
- ALTER TABLE Statement 7705
- The ALTER TABLE statement changes the schema of an existing table in the catalog. Examples CREATE TABLE integers (i INTEGER, j INTEGER); Add a new column with name k to the table integers , it will be filled with the default value NULL : AL
...made by ALTER TABLE fully respect the transactional semantics, i.e., they will not be visible to other transactions until committed, and can be fully reverted through a rollback. RENAME TABLE Rename a table: ALTER TABLE integers RENAME TO integers_old; T... - https://man.mtool.work/duckdb/2.0/sql/statements/alter_table.html
- ODBC Extension Functions 7490
- 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) ->
...l it back on error max_records_in_transaction ( UBIGINT , default: 0 ): when specified causes the remote transaction to be committed every time after the specified number of rows is processed close_connection ( BOOLEAN , default: false ): closes the passe... - https://man.mtool.work/duckdb/2.0/core_extensions/odbc/functions.html
- Connect 7294
- Overview Every DuckDB feature reachable from Java starts with a Connection . This page covers the JDBC URL forms the driver accepts, how DuckDB and driver options are passed and which of them win, how connections come to share (or not share
...ing its connections, the write-ahead log is left in place. It is replayed the next time the database file is opened, so no committed data is lost, but the file is only compacted once the database is checkpointed on a clean shutdown. To force a checkpoint... - https://man.mtool.work/duckdb/2.0/clients/java/connecting.html
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