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- Reading and Writing Parquet Files – DuckDB 12813
- This page is for DuckDB 1.3, which is outdated.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
...of the entire database as parquet: EXPORT DATABASE 'target_directory' ( FORMAT parquet ); Parquet Files Parquet files are compressed columnar files that are efficient to load and process. DuckDB provides support for both reading and writing Parquet files...e the COPY Statement page for details, including all possible parameters for the COPY statement. Write a query to a Snappy-compressed Parquet file: COPY ( SELECT * FROM tbl ) TO 'result-snappy.parquet' ( FORMAT parquet ); Write tbl to a zstd-compressed Par...quet file: COPY tbl TO 'result-zstd.parquet' ( FORMAT parquet , COMPRESSION zstd ); Write tbl to a zstd-compressed Parquet file with the lowest compression level yielding the fastest compression: COPY tbl TO 'result-zstd.parquet' ( FORMA... - https://man.mtool.work/duckdb/1.3/data/parquet/overview.html
- Execution Format – DuckDB 12043
- This page is for DuckDB 1.3, which is outdated.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
..., which allow the system to store the same logical data with a different physical representation . This allows for a more compressed representation, and potentially allows for compressed execution throughout the system. Below the list of supported vector...formats is shown. Flat Vectors Flat vectors are physically stored as a contiguous array, this is the standard uncompressed vector format. For flat vectors the logical and physical representations are identical. Constant Vectors Constant vectors...dictionary Just like constant vectors, dictionary vectors are also emitted by the storage. When deserializing a dictionary compressed column segment, we store this in a dictionary vector so we can keep the data compressed during query execution. Sequence V... - https://man.mtool.work/duckdb/1.3/internals/vector.html
- Advanced Installation Methods – DuckDB 10485
- This page is for DuckDB 1.3, which is outdated.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
...STALL command can be used with the path to a .duckdb_extension file: INSTALL 'path/to/httpfs.duckdb_extension' ; Note that compressed .duckdb_extension.gz files need to be decompressed beforehand. It is also possible to specify remote paths. Loading an Ext...s will skip any currently installed extensions and load the specified extension directly. Note that using remote paths for compressed files is currently not possible. Building and Installing Extensions from Source For building and installing extensions fro...ensions directly used httpfs files Downloading building DuckDB buckets ⟩/⟨ example Installing Extension Explicit Path Note compressed remote paths load currently 関連するページ Extension Distribution httpfs Extension for HTTP and S3 Support Installing Exte... - https://man.mtool.work/duckdb/1.3/extensions/advanced_installation_methods.html
- File Formats – DuckDB 9522
- 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
...ways be somewhat faster, which over time amortizes the initial load time. High decompression times: Some Parquet files are compressed using heavyweight compression algorithms such as gzip. In these cases, querying the Parquet files will necessitate an expe...ips on reading and writing Parquet files, see the Parquet Tips page . Loading CSV Files CSV files are often distributed in compressed format such as GZIP archives ( .csv.gz ). DuckDB can decompress these files on the fly. In fact, this is typically faster...than decompressing the files first and loading them due to reduced IO. Schema Load time Load from GZIP-compressed CSV files ( .csv.gz ) 107.1 s Decompressing (using parallel gunzip ) and loading from decompressed CSV files 121.3 s Loadi... - https://man.mtool.work/duckdb/1.3/guides/performance/file_formats.html
- Importing Data – DuckDB 8945
- 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 ); Or use the COPY statement : COPY tbl FROM 'test.csv' ( HEADER false ); It is also possible to read data directly from compressed CSV files (e.g., compressed with gzip ): SELECT * FROM 'test.csv.gz' ; DuckDB can create a table from the loaded data usin... - https://man.mtool.work/duckdb/1.3/data/overview.html
- Configuration – DuckDB 7964
- 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
...Allow the database to cache external files (e.g., Parquet) in memory. BOOLEAN true enable_fsst_vectors Allow scans on FSST compressed segments to emit compressed vectors to utilize late decompression BOOLEAN false enable_geoparquet_conversion Attempt to de... - https://man.mtool.work/duckdb/1.3/configuration/overview.html
- Querying Parquet Metadata – DuckDB 7772
- 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
...compression VARCHAR encodings VARCHAR index_page_offset BIGINT dictionary_page_offset BIGINT data_page_offset BIGINT total_compressed_size BIGINT total_uncompressed_size BIGINT key_value_metadata MAP(BLOB, BLOB) bloom_filter_offset BIGINT bloom_filter_leng... - https://man.mtool.work/duckdb/1.3/data/parquet/metadata.html
- Partitioned Writes – DuckDB 7772
- 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
...( FORMAT csv , PARTITION_BY ( year , month ), OVERWRITE_OR_IGNORE ); Write a table to a Hive partitioned data set of GZIP-compressed CSV files, setting explicit data files' extension: COPY orders TO 'orders' ( FORMAT csv , PARTITION_BY ( year , month ), C... - https://man.mtool.work/duckdb/1.3/data/partitioning/partitioned_writes.html
- Guides – DuckDB 7772
- 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
...optimal performance What is the ideal hardware environment for DuckDB What performance implications do Parquet files and (compressed) CSV files have How to tune workloads Benchmarks Meta Queries How to list all tables How to view the schema of the result... - https://man.mtool.work/duckdb/1.3/guides/overview.html
- EXPORT and IMPORT DATABASE Statements – DuckDB 7772
- 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
...PORT DATABASE 'target_directory' ( FORMAT parquet ); Export to directory 'target_directory', tables serialized as Parquet, compressed with ZSTD, with a row_group_size of 100,000: EXPORT DATABASE 'target_directory' ( FORMAT parquet , COMPRESSION zstd , ROW_... - https://man.mtool.work/duckdb/1.3/sql/statements/export.html
DuckDB 1.3 Documentation / man.mtool.work