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- Pattern Matching – DuckDB 15592
- This page is for DuckDB 1.3, which is outdated.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
...hen searching for filenames that follow a specific pattern (for example a specific file extension). Some examples: SELECT 'best.txt' GLOB '*.txt' ; -- true SELECT 'best.txt' GLOB '????.txt' ; -- true SELECT 'best.txt' GLOB '?.txt' ; -- false SELECT '...best.txt' GLOB '[abc]est.txt' ; -- true SELECT 'best.txt' GLOB '[a-z]est.txt' ; -- true The bracket syntax is case-sensitive: SELECT 'Best.txt' GLOB '[a-z]est.txt' ; -- false...SELECT 'Best.txt' GLOB '[a-zA-Z]est.txt' ; -- true The ! applies to all characters within the brackets: SELECT 'Best.txt' GLOB '[!a-zA-... - https://man.mtool.work/duckdb/1.3/sql/functions/pattern_matching.html
- Tuning Workloads – DuckDB 10195
- This page is for DuckDB 1.3, which is outdated.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
...supports caching remote data. To inspect the content of the external file cache, run: FROM duckdb_external_file_cache (); Best Practices for Using Connections DuckDB will perform best when reusing the same database connection many times. Disconnecti...adata in memory, and that cache is lost when the last open connection is closed. Frequently, a single connection will work best, but a connection pool may also be used. Using multiple connections can parallelize some operations, although it is typica...Blocking Operators Limitations Profiling Prepared Statements Querying Remote Files Avoid Reading Unnecessary Data Caching Best Practices for Using Connections Persistent vs. In-Memory Tables... - https://man.mtool.work/duckdb/1.3/guides/performance/how_to_tune_workloads.html
- Building DuckDB from Source – DuckDB 9680
- This page is for DuckDB 1.3, which is outdated.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
...y Exception Handling Below, we provide detailed build instructions for some platforms: Android Raspberry Pi Platforms with Best Effort Support Platform name Description freebsd_amd64 FreeBSD x86_64 (amd64) freebsd_arm64 FreeBSD AArch64 (arm64) wasm_m...5M lines of code. To generate this file, run: python scripts/amalgamation.py Note that amalgamation build is provided on a best-effort basis and is not officially supported. Limitations Currently, DuckDB has the following limitations: The DuckDB code...DuckDB? Prerequisites Getting Started Platforms Platforms with Full Support Platforms with Partial Support Platforms with Best Effort Support Outdated Platforms Amalgamation Build Limitations Troubleshooting Guides... - https://man.mtool.work/duckdb/1.3/dev/building/overview.html
- File Formats – DuckDB 9332
- 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
.... Parquet The queries on the TPC-H benchmark run approximately 1.1-5.0× slower on Parquet files than on a DuckDB database. Bestpractice If you have the storage space available, and have a join-heavy workload and/or plan to run many queries on the sam...large effect on performance: study these using the parquet_metadata function . The Effect of Row Group Sizes DuckDB works best on Parquet files with row groups of 100K-1M rows each. The reason for this is that DuckDB can only parallelize over row gr...han 5-10× larger than ideally-sized row groups, while row group sizes between 5,000 and 20,000 are still 1.5-2.5× off from best performance. Above row group size of 100,000, the differences are small: the gap is about 10% between the best and the wor... - https://man.mtool.work/duckdb/1.3/guides/performance/file_formats.html
- Environment – DuckDB 8634
- 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
.... Hardware Configuration CPU DuckDB works efficiently on both AMD64 (x86_64) and ARM64 (AArch64) CPU architectures. Memory Bestpractice Aim for 1-4 GB memory per thread. Minimum Required Memory As a rule of thumb, DuckDB requires a minimum of 125 MB...mory mode as DuckDB still spills to disk in both modes. Local Disk Disk type. DuckDB's disk-based mode is designed to work best with SSD and NVMe disks. While HDDs are supported, they will result in low performance, especially for write operations. D...emory instance due to compression. Read more in the “How to Tune Workloads” page . File systems. On Linux, DuckDB performs best with the XFS file system but it also performs reasonably well with other file systems such as ext4. On Windows, we recomme... - https://man.mtool.work/duckdb/1.3/guides/performance/environment.html
- Indexing – DuckDB 8634
- 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
...se. Then, DuckDB will likely be unable to skip any row groups. If you query specific columns with selective filters, it is best to pre-order data by those columns when inserting it. Even an imperfect ordering will still be helpful. The best case of o...he required parts of the index. Therefore, having an index will not cause any slowdowns when opening an existing database. Bestpractice We recommend following these guidelines: Only use primary keys, foreign keys, or unique constraints, if these are... - https://man.mtool.work/duckdb/1.3/guides/performance/indexing.html
- My Workload Is Slow – DuckDB 7937
- 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
...orming the following checks. More detailed instructions are linked for each point. Do you have enough memory? DuckDB works best if you have 1-4 GB memory per thread . Are you using a fast disk? Network-attached disks (such as cloud block storage) cau... - https://man.mtool.work/duckdb/1.3/guides/performance/my_workload_is_slow.html
- Working with Huge Databases – DuckDB 7937
- 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
...On block-based storage, the file has a big effect on performance when working with large files. On Linux, DuckDB performs best with XFS on large files. For storing large amounts of data, consider using the DuckLake Lakehouse format . 関連キーワード... - https://man.mtool.work/duckdb/1.3/guides/performance/working_with_huge_databases...
- Overview – DuckDB 7937
- 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
...dvice for these cases and also offers convenient configuration snippets such as Gitignore files. For advice on getting the best performance from DuckDB, see also the Performance Guide . Pages in This Section 関連キーワード DuckDB advice operations al... - https://man.mtool.work/duckdb/1.3/operations_manual/overview.html
- Deploying DuckDB-Wasm – DuckDB 7771
- 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
...epository from the public https://extensons.duckdb.org to the one specified. Note that extensions are still signed, so the best path is downloading and serving the extensions with a similar structure to the original repository. See additional notes a... - https://man.mtool.work/duckdb/1.3/clients/wasm/deploying_duckdb_wasm.html
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