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- Working with Huge Databases 11441
- This page contains information for working with huge DuckDB database files. While most DuckDB databases are well below 1 TB, in our 2024 user survey , 1% of respondents used DuckDB files of 2 TB or more (corresponding to roughly 10 TB of CS
...V files). DuckDB's native database format supports huge database files without any practical restrictions, however, there are a few things to keep in mind when working with huge database files. Object storage systems have lower... - https://man.mtool.work/duckdb/2.0/guides/performance/working_with_huge_databases...
- Bitstring Type 11441
- Name Aliases Description BITSTRING BIT Variable-length strings of 1s and 0s Bitstrings are strings of 1s and 0s. The bit type data is of variable length. A bitstring value requires 1 byte for each group of 8 bits, plus a fixed amount to sto
...re some metadata. By default bitstrings will not be padded with zeroes. Bitstrings can be very large, having the same size restrictions as BLOB s. Creating a Bitstring A string encoding a bitstring can be cast to a BITSTRING : SELECT '101010'::BITSTRING AS b... - https://man.mtool.work/duckdb/2.0/sql/data_types/bitstring.html
- Blob Type 10953
- Name Aliases Description BLOB BYTEA , BINARY , VARBINARY Variable-length binary data The blob ( B inary L arge OB ject) type represents an arbitrary binary object stored in the database system. The blob type can contain any type of binary d
...ata with no restrictions. What the actual bytes represent is opaque to the database system. Create a BLOB value with a single byte (170): SELECT '\... - https://man.mtool.work/duckdb/2.0/sql/data_types/blob.html
- Benchmark Suite 8476
- DuckDB has an extensive benchmark suite. When making changes that have potential performance implications, it is important to run these benchmarks to detect potential performance regressions. Getting Started To build the benchmark suite, ru
...he data is prepared, we are finally ready to specify the query we will benchmark! This is done in the run section, and the restrictions are the same as for a unit test (e.g., no blank lines, etc.) For the FILL benchmark, we want to find all places where the... - https://man.mtool.work/duckdb/2.0/dev/benchmark.html
- Load Extensions 7970
- Overview DuckDB-Wasm's (dynamic) extension loading is modeled after regular DuckDB's extension loading, with a few relevant differences due to the difference in platform. A growing subset of core, community, and external extensions is suppo
...Wasm, because HTTPS capabilities have to go through an additional layer, the browser, which adds both differences and some restrictions relative to native. Instead, DuckDB-Wasm ships a separate JavaScript implementation of the same functionality. Running LOA... - https://man.mtool.work/duckdb/2.0/clients/wasm/extensions.html
- AsOf Join 7970
- What is an AsOf Join? Time series data is not always perfectly aligned. Clocks may be slightly off, or there may be a delay between cause and effect. This can make connecting two sets of ordered data challenging. AsOf joins are a tool for s
...es the USING keyword to list the fields that should be compared for equality. AsOf also supports this syntax, but with two restrictions: The last field is the inequality The inequality is >= (the most common case) Our first query can then be written as: SELE... - https://man.mtool.work/duckdb/2.0/guides/sql_features/asof_join.html
- Command Line Client 6994
- 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.
...L order based on the environment variable DEFAULT_NULL_ORDER , use: SET default_null_order = getenv('DEFAULT_NULL_ORDER'); Restrictions for Reading Environment Variables The getenv function can only be run when the enable_external_access option is set to tru... - https://man.mtool.work/duckdb/2.0/clients/cli/overview.html
- SQL Introduction 6994
- This page provides an overview of how to perform simple operations in SQL. This tutorial is only intended to give you an introduction and is in no way a complete tutorial on SQL. This tutorial is adapted from the PostgreSQL tutorial . DuckD
...he part that lists the tables from which to retrieve the data), and an optional qualification (the part that specifies any restrictions). For example, to retrieve all the rows of table weather, type: SELECT * FROM weather; Here * is a shorthand for “all colu... - https://man.mtool.work/duckdb/2.0/sql/introduction.html
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