Results of 1 - 10 of about 10 for async (0.002 sec.)
- I/O 12317
- Warning DuckDB ships with safe defaults. The configuration options described on this page are advanced options, so proceed with caution when changing them. Asynchronous I/O New Asynchronous I/O was introduced in DuckDB 2.0. Starting with v2
....0, DuckDB supports asynchronous I/O. Instead of blocking a worker thread until requested data arrives, DuckDB issues reads in the background and ke...when reading data from object storage such as S3. For a detailed explanation of the design and benchmark results, see the “Asynchronous I/O in DuckDB” blog post . Supported Formats Asynchronous I/O is currently supported for the following formats: Par...seekable CSV files encoded in UTF-8 DuckDB's native storage format Other formats, such as JSON files, use synchronous I/O. Asynchronous I/O is used automatically for the supported formats, including when they are read through data lake formats such as... - https://man.mtool.work/duckdb/2.0/data/io.html
- Connect 11084
- Overview Every DuckDB feature reachable from Java starts with a Connection . This page covers the JDBC URL forms the driver accepts, how DuckDB and driver options are passed and which of them win, how connections come to share (or not share
...into the library, and starts threads - external_threads background threads. In addition, DuckDB 2.0 runs a second pool of asynchronous threads dedicated to blocking I/O, such as HTTP requests to object storage (see Asynchronous I/O ). Its size is set...by the async_threads option, which defaults to four times the number of CPU threads, capped at 256. On a 16-core machine, that is 15 wo...rker threads plus 64 asynchronous threads, roughly 80 native threads per database instance. To bound the thread count, set both threads and async_thr... - https://man.mtool.work/duckdb/2.0/clients/java/connecting.html
- Swift Client 10726
- DuckDB has a Swift client. See the announcement post for details. Instantiating DuckDB DuckDB supports both in-memory and persistent databases. To work with an in-memory database, run: let database = try Database(store: .inMemory) To work w
...to DuckDB: CREATE TABLE exoplanets AS SELECT * FROM read_csv('downloaded_exoplanets.csv'); Let's package this up as a new asynchronous factory method on our ExoplanetStore type: import DuckDB import Foundation final class ExoplanetStore { // Factory...method to create and prepare a new ExoplanetStore static func create() async throws -> ExoplanetStore { // Create our database and connection as described above let database = try Database(store: .in...ase, connection: Connection) { ... } } Querying the Database The following example queries DuckDB from within Swift via an async function. This means the callee won't be blocked while the query is executing. We'll then cast the result columns to Swift... - https://man.mtool.work/duckdb/2.0/clients/tertiary_clients/swift.html
- Configuration 9135
- DuckDB has a number of configuration options that can be used to change the behavior of the system. The configuration options can be set using either the SET statement or the PRAGMA statement . They can be reset to their original values usi
...tions mention both schemas and catalogs: the path is a list of schemas, whose entries may optionally be catalog-qualified. Asynchronous I/O Settings New Asynchronous I/O, along with the settings that tune it, was introduced in DuckDB 2.0. The async_th...reads and read_ahead_depth settings control the size of the asynchronous thread pool and the read-ahead budget used when reading from object storage and HTTP servers. They are listed in th...p_join_threshold The maximum number of rows we need on the left side of an ASOF join to use a nested loop join. UBIGINT 64 async_threads The number of total async threads used by the system for tasks like I/O. BIGINT 4 × # CPU cores (max. 256) auto_ch... - https://man.mtool.work/duckdb/2.0/configuration/overview.html
- Troubleshooting 8956
- Troubleshooting Running EXPLAIN Renders Newlines In Python, the output of the EXPLAIN statement contains hard line breaks ( \n ): In [1]: import duckdb ...: duckdb.sql("EXPLAIN SELECT 42 AS x") Out[1]: ┌───────────────┬─────────────────────
...ultiarray before starting up threads. Many Threads per Database Besides its worker threads, each database starts a pool of asynchronous I/O threads : by default four times the number of CPU cores, at most 256. Every duckdb.connect() to an unnamed in-m...emory database starts a new database, so a process that opens many of them runs many threads. To start fewer, set async_threads when connecting: import duckdb con = duckdb.connect(config={"async_threads": 4}) Fetching Time Zone Aware Values N... - https://man.mtool.work/duckdb/2.0/clients/python/known_issues.html
- Python API 8259
- Installation To use the DuckDB Python client, visit the Python installation page . The latest stable version of the DuckDB Python client is 2.0.0. Installation The DuckDB Python API can be installed using pip : pip install duckdb . Please s
...mple: import duckdb con = duckdb.connect(config={"threads": 1}) Besides its worker threads, each database starts a pool of asynchronous I/O threads : by default four times the number of CPU cores, at most 256. To start fewer, set async_threads : con =...duckdb.connect(config={"threads": 4, "async_threads": 4}) To specify the storage version , pass the storage_compatibility_version option. DuckDB 1.5 cannot open a dat... - https://man.mtool.work/duckdb/2.0/clients/python/overview.html
- What's New in the Docs for 2.0 7562
- This page tracks the documentation for the features introduced in DuckDB 2.0, organized around the themes of the DuckDB 2.0.0 release announcement . Each section links to the relevant documentation. DuckDB as a Server: Quack and CONNECT Sin
...source rows in MERGE INTO and UPDATE ... FROM SECURE VIEW SHOW statement Setting a sequence value regexp_extract additions Asynchronous I/O DuckDB 2.0 issues reads in the background and keeps multiple requests in flight, which speeds up queries that r...ead from object storage such as S3. The behavior is controlled by the async_threads and read-ahead settings. Asynchronous I/O overview Thread pools and read-ahead Asynchronous I/O configuration sett... - https://man.mtool.work/duckdb/2.0/whats_new_in_the_docs.html
- Tuning Workloads 7204
- DuckDB aims to perform well out of the box, so most workloads do not require any tuning. When tuning is worthwhile, there is no single configuration or magic number that is optimal for every workload: the right settings depend on what you a
...s with different parameters Prepared statements Prepared statements Reading files over a slow or unreliable network Tuning asynchronous I/O and minimizing IO Querying remote files Running many small queries Reusing a single connection Best practices f...r, it is optimized for running larger, less frequent queries. Querying Remote Files Starting with version 2.0, DuckDB uses asynchronous I/O when reading Parquet files, uncompressed, seekable UTF-8 CSV files and DuckDB database files (e.g., attached ov...ally, so there is no need to raise the number of threads. If the defaults do not saturate your network bandwidth, tune the async_threads and read_ahead_depth settings instead. Other formats, such as JSON files and compressed CSV files, still use synch... - https://man.mtool.work/duckdb/2.0/guides/performance/how_to_tune_workloads.html
- Reference 7204
- This page lists the functions, settings, and log types exposed by the quack extension . For a tour of the protocol, start with the Overview . Function Reference Server Management Function Description quack_serve(⟨listen_uri⟩, ...) Start a s
...ack_fetch_read_ahead UBIGINT 0 Number of FETCH requests the client keeps in flight ahead of the scan. 0 uses the number of async threads. quack_rebalance_buffer_bytes UBIGINT 0 Pending bytes the batch rebalancer buffers before gating non-minimum produ... - https://man.mtool.work/duckdb/2.0/quack/reference.html
- Node.js Client (Neo) 6847
- Installation To use the DuckDB Node.js client, visit the Node.js installation page . The latest stable version of the DuckDB Node.js (Neo) client is 2.0.0. An API for using DuckDB in Node.js . The primary package, @duckdb/node-api , is a hi
...= await prepared.run(); // ... } Control Evaluation of Tasks import { DuckDBPendingResultState } from '@duckdb/node-api'; async function sleep(ms) { return new Promise((resolve) => { setTimeout(resolve, ms); }); } const prepared = await connection.pr...ait pending.readAll(); const reader = await pending.readUntil(targetRowCount); Ways to Get Result Data // From a result // Asynchronously retrieve data for all rows: const columns = await result.getColumns(); const columnsJson = await result.getColumn...jects = await result.getRowObjects(); const rowObjectsJson = await result.getRowObjectsJson(); // From a reader // First, (asynchronously) read some rows: await reader.readAll(); // or: await reader.readUntil(targetRowCount); // Then, (synchronously)... - https://man.mtool.work/duckdb/2.0/clients/node_neo/overview.html
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