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- Internal Errors 12907
- Internal errors signal an assertion failure within DuckDB. They usually occur due to unexpected conditions or errors in the program's logic. For example, running issue 17002 on DuckDB 1.2.1 results in an internal error. INTERNAL Error: Atte
...ctor of size 3 The issue is fixed in DuckDB 1.2.2 and newer versions. After encountering an internal error, DuckDB enters “restricted mode”, where any further operations will result in the following error message: FATAL Error: Failed: database has been inv...in. To continue working with the same database, start a new DuckDB session on the same database. The reason DuckDB enters “restricted mode” is because the database is in an undefined state. Internal errors are by definition bugs that should never happen so... - https://man.mtool.work/duckdb/2.0/dev/internal_errors.html
- Information Schema 11352
- The views in the information_schema are SQL-standard views that describe the catalog entries of the database. These views can be filtered to obtain information about a specific column or table. DuckDB's implementation is based on PostgreSQL
.... VARCHAR 'exams_exam_id_fkey' table_catalog Name of the database that contains the table that contains the column that is restricted by this constraint (always the current database). VARCHAR 'my_db' table_schema Name of the schema that contains the table...that contains the column that is restricted by this constraint. VARCHAR 'main' table_name Name of the table that contains the column that is restricted by this constr...aint. VARCHAR 'exams' column_name Name of the column that is restricted by this constraint. VARCHAR 'exam_id' ordinal_position Ordinal position of the column within the constraint key (count sta... - https://man.mtool.work/duckdb/2.0/sql/meta/information_schema.html
- Troubleshoot 10011
- 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
...ace the library file beside the executable. Both options are described on the Deploy as Native Image page. Warning about a Restricted Method in java.lang.System On JDK 24 and later, loading the driver prints: WARNING: A restricted method in java.lang.Syste... - https://man.mtool.work/duckdb/2.0/clients/java/troubleshoot.html
- Troubleshooting of Extensions 8652
- You might be visiting this page directed via a DuckDB error message, similar to: INSTALL non_existing; HTTP Error: Failed to download extension "non_existing" at URL "http://extensions.duckdb.org/v2.0.0/osx_arm64/non_existing.duckdb_extensi
...command can succeed from one network and fail from another. To work around this, you can: Connect from a network in a non-restricted region (for example, through a VPN). Download the extension manually from an allowed location and install it from the loca... - https://man.mtool.work/duckdb/2.0/extensions/troubleshooting.html
- Crashes 8205
- DuckDB is thoroughly tested via an extensive test suite. However, bugs can still occur and these can sometimes lead to crashes. This page contains practical information on how to troubleshoot DuckDB crashes. Types of Crashes There are a few
...INTERNAL Error: Attempted to access index 3 within vector of size 3 After encountering an internal error, DuckDB enters a restricted mode where any further operations will result in the following error message: console FATAL Error: Failed: database has be... - https://man.mtool.work/duckdb/2.0/guides/troubleshooting/crashes.html
- Securing DuckDB 7758
- DuckDB is a powerful analytical database engine. It can read and write files, access the network, load extensions, and use system resources. Like any powerful tool, these capabilities require appropriate configuration when working with sens
...when running untrusted code such as: Use duckdb-wasm for sandboxing Run DuckDB in an isolated container (e.g., Docker with restricted capabilities) Use a virtual machine or separate process with minimal privileges Apply operating system-level sandboxing Us...iguration settings do not disable themselves, such as the resource constraints. If you allow users to run SQL statements unrestricted on your own hardware, you might want to consider locking the configuration after your own configuration has finished using... - https://man.mtool.work/duckdb/2.0/operations_manual/securing_duckdb/overview.htm...
- Security 7758
- This page covers Quack's security posture end to end: what the server exposes, what stays local, the role of a TLS-terminating reverse proxy, and the authentication / authorization callbacks the server runs on every connection and every que
...nd SQL Macros section. Beyond SQL Macros SQL macros cover most authentication and authorization cases, but a macro body is restricted to a single expression and cannot execute DML directly: there is no INSERT , UPDATE , or DELETE inside a macro. For polici... - https://man.mtool.work/duckdb/2.0/quack/security.html
- INSERT Statement 7758
- The INSERT statement inserts new data into a table. Examples Insert the values 1, 2, 3 into tbl : INSERT INTO tbl VALUES (1), (2), (3); Insert the result of a query into a table: INSERT INTO tbl SELECT * FROM other_tbl; Insert values into t
...UES (1, 20, 900) ON CONFLICT (j) DO UPDATE SET k = 5 * EXCLUDED.k; i j k 1 20 4500 The DO UPDATE SET action may be further restricted with a WHERE clause, which is checked for each conflicting row. Conflicting rows that do not meet the condition are left u... - https://man.mtool.work/duckdb/2.0/sql/statements/insert.html
- Command Line Client 7544
- Installation To use the DuckDB CLI client, visit the CLI installation page . The latest stable version of the DuckDB command line client is 2.0.0. Installation The DuckDB CLI (Command Line Interface) is a single, dependency-free executable.
...is missing or not writable, startup can fail with an error such as IO Error: Failed to create directory . In sandboxed or restricted environments, set the HOME environment variable to a writable location to control where these files are created. See Files... - https://man.mtool.work/duckdb/2.0/clients/cli/overview.html
- WITH Clause 7311
- The WITH clause allows you to specify common table expressions (CTEs). Regular (non-recursive) common-table-expressions are essentially views that are limited in scope to a particular query. CTEs can reference each other and can be nested.
...[1, 5, 8] 1 4 [1, 3, 5, 4] 1 8 [1, 3, 5, 8] 1 8 [1, 5, 3, 8] 1 10 [1, 5, 3, 10] Note that the result of this query is not restricted to shortest paths, e.g., for node 5, the results include paths [1, 5] and [1, 3, 5] . Enumerate Unweighted Shortest Paths... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/with.html
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