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- Spatial Extension – DuckDB 11368
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...floats). But what makes it somewhat special is that its actually used to store one of several different geometry subtypes. These are POINT , LINESTRING , POLYGON , as well as their “collection” equivalents, MULTIPOINT , MULTILINESTRING and MULTIPOLYGO..._2D , LINESTRING_2D , POLYGON_2D and BOX_2D that are based on DuckDBs native nested types, such as STRUCT and LIST . Since these have a fixed and predictable internal memory layout, it is theoretically possible to optimize a lot of geospatial algorith...ms to be much faster when operating on these types than on the GEOMETRY type. However, only a couple of functions in the spatial extension have been explicitly special... - https://man.mtool.work/duckdb/1.3/core_extensions/spatial/overview.html
- Tuning Workloads – DuckDB 10450
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...lable memory, an out of memory error may occur: Out of Memory Error: failed to allocate data of size ... (.../... used) In these cases, consider setting the preserve_insertion_order configuration option to false : SET preserve_insertion_order = false...te that in certain cases DuckDB may launch too many threads (e.g., due to HyperThreading), which can lead to slowdowns. In these cases, it's worth manually limiting the number of threads using SET threads = X . Larger-than-Memory Workloads (Out-of-Cor..._dir.tmp/' ; Blocking Operators Some operators cannot output a single row until the last row of their input has been seen. These are called blocking operators as they require their entire input to be buffered, and are the most memory-intensive operato... - https://man.mtool.work/duckdb/1.3/guides/performance/how_to_tune_workloads.html
- Numeric Types – DuckDB 10188
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...integer. The type aliases INT1 , INT2 , INT4 and INT8 for signed integers were inherited from PostgreSQL, where digits in these names indicate their size in bytes , whereas the type aliases for their unsigned equivalents, UINT8 , UINT16 , UINT32 and...e, SMALLINT is 2 bytes, etc. But sometimes you need numbers that are even bigger than what is supported by a HUGEINT ! For these situations the VARINT type can come in handy, as the VARINT type has a much bigger limit (the value can consist of up to 1...ficient. Floating-Point Types The data types FLOAT and DOUBLE precision are variable-precision numeric types. In practice, these types are usually implementations of IEEE Standard 754 for Binary Floating-Point Arithmetic (single and double precision,... - https://man.mtool.work/duckdb/1.3/sql/data_types/numeric.html
- Building DuckDB from Source – DuckDB 9926
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...kDB binaries are available for stable and preview builds on the installation page . In most cases, it's recommended to use these binaries. When you are running on an experimental platform (e.g., Raspberry Pi ) or you would like to build the project fo...l Support DuckDB fully supports Linux, macOS and Windows. Both x86_64 (amd64) and AArch64 (arm64) builds are available for these platforms, and almost all extensions are distributed for these platforms. Platform name Description linux_amd64 Linux x86_...acOS 12+ arm64 (Apple Silicon CPUs) windows_amd64 Windows 10+ x86_64 (amd64) windows_arm64 Windows 10+ AArch64 (arm64) For these platforms, builds are available for both the latest stable version and the preview version (nightly build). In some circum... - https://man.mtool.work/duckdb/1.3/dev/building/overview.html
- Indexing – DuckDB 9664
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...es). Changes on indexed tables perform worse than their non-indexed counterparts. That is because of index maintenance for these operations. For some use cases, single-column ART indexes improve the performance of highly selective queries using the in...IN(...) conditions. It also pushes dynamic filters, e.g., from hash joins, into the scan, allowing dynamic index scans on these filters. Indexes are only eligible for index scans if they index a single column without expressions. E.g., the following...nality) . You can configure this threshold via index_scan_percentage and index_scan_max_count , or disable them by setting these values to zero. When in doubt, use EXPLAIN ANALYZE to verify that your query plan uses the index scan. Indexes and Memory... - https://man.mtool.work/duckdb/1.3/guides/performance/indexing.html
- File Formats – DuckDB 9402
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...has advanced support for Parquet files, which includes directly querying Parquet files . When deciding on whether to query these files directly or to first load them to the database, you need to consider several factors. Reasons for Querying Parquet F...of basic statistics: Parquet files use a columnar storage format and contain basic statistics such as zonemaps . Thanks to these features, DuckDB can leverage optimizations such as projection and filter pushdown on Parquet files. Therefore, workloads...les Lack of advanced statistics: The DuckDB database format has the hyperloglog statistics that Parquet files do not have. These improve the accuracy of cardinality estimates, and are especially important if the queries contain a large number of join... - https://man.mtool.work/duckdb/1.3/guides/performance/file_formats.html
- Building Configuration – DuckDB 9139
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
.../ Building DuckDB Copy Markdown Building Configuration 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 sym...mance. debug This build runs with all the debug information, including symbols, assertions and #ifdef DEBUG blocks. Due to these, binaries of this build are expected to be slow. Note: the special debug defines are not automatically set for this build....ing it to fail if this check fails. Extension Selection Core DuckDB extensions are the ones maintained by the DuckDB team. These are hosted in the duckdb GitHub organization and are served by the core extension repository. Core extensions can be built... - https://man.mtool.work/duckdb/1.3/dev/building/build_configuration.html
- Building Extensions – DuckDB 8615
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...E enabled queries through our test suite. Debug Flags CRASH_ON_ASSERT D_ASSERT(condition) is used all throughout the code, these will throw an InternalException in debug builds. With this flag enabled, when the assertion triggers it will instead direc...ructures that are used extensively throughout the non-performance-critical code have extra checks to ensure memory safety, these checks include: Making sure nullptr is never dereferenced. Making sure index out of bounds accesses don't trigger a crash....With this flag enabled we remove these checks, this is mostly done to check that the performance hit of these checks is negligible. DESTROY_UNPINNED_BLOCKS When... - https://man.mtool.work/duckdb/1.3/dev/building/building_extensions.html
- Relational API on Pandas – DuckDB 8091
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...Copy Markdown Relational API on Pandas DuckDB offers a relational API that can be used to chain together query operations. These are lazily evaluated so that DuckDB can optimize their execution. These operators can act on Pandas DataFrames, DuckDB tab...es, join, union, and more. They are also able to directly insert results into a DuckDB table or write to a CSV. Please see these additional examples and the available relational methods on the DuckDBPyRelation class . 関連キーワード DuckDB Pandas rela...tional chain operators DataFrame input Relational used together operations These execution import duckdb pandas connect relation transformed also Documentation Guides Copy Markdown offers 関連するページ... - https://man.mtool.work/duckdb/1.3/guides/python/relational_api_pandas.html
- Profiling – DuckDB 7960
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...bers of individual operators and the cardinalities that pass through them. The EXPLAIN ANALYZE statement enables obtaining these, as it pretty-prints the query plan and also executes the query. Thus, it provides the actual run-time performance numbers...llowing pragmas are available and can be set using either PRAGMA or SET . They can also be reset using RESET , followed by the setting name. For more information, see the “Profiling” section of the pragmas page. Setting Description Default Options ena...umulative Metrics DuckDB also supports several cumulative metrics that are available in all nodes. In the QUERY_ROOT node, these metrics represent the sum of the corresponding metrics across all operators in the query. The OPERATOR nodes represent the... - https://man.mtool.work/duckdb/1.3/dev/profiling.html
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