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DuckDB 1.3 ドキュメント 全文検索
Results of 1 - 5 of about 5 for selective (0.002 sec.)
- Indexing – DuckDB 12851
- This page is for DuckDB 1.3, which is outdated.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
...every row in the worst case. 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...al way to exploit ordering is to use the INTEGER type with automatic increments rather than UUID for columns queried using selective filters. In a scenario where a table contains out-of-order UUID s, DuckDB has to scan many row groups to find a specific U...of index maintenance for these operations. For some use cases, single-column ART indexes improve the performance of highly selective queries using the indexed column. An ART index does not affect the performance of join, aggregation, and sorting queries.... - https://man.mtool.work/duckdb/1.3/guides/performance/indexing.html
- Querying Parquet Metadata – DuckDB 8365
- This page is for DuckDB 1.3, which is outdated.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
...OB value BLOB Bloom Filters DuckDB supports Bloom filters for pruning the row groups that need to be read to answer highly selective queries. Currently, Bloom filters are supported for the following types: Integer types: TINYINT , UTINYINT , SMALLINT , US... - https://man.mtool.work/duckdb/1.3/data/parquet/metadata.html
- Parquet Tips – DuckDB 8365
- This page is for DuckDB 1.3, which is outdated.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 number of CPU threads used to query that file. More row groups beyond the thread count would improve the speed of highly selective queries, but slow down queries that must scan the whole file like aggregations. To write a query to a Parquet file with a... - https://man.mtool.work/duckdb/1.3/data/parquet/tips.html
- Schema – DuckDB 8162
- 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
...rimary key then add primary key 242.0 s For this data set, primary keys will only have a (small) positive effect on highly selective queries such as when filtering on a single identifier. Definining primary keys (or indexes) will not have an effect on joi... - https://man.mtool.work/duckdb/1.3/guides/performance/schema.html
- Indexes – DuckDB 8162
- 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
...(ART) An Adaptive Radix Tree (ART) is mainly used to ensure primary key constraints and to speed up point and very highly selective (i.e., < 0.1%) queries. ART indexes can be created manually using CREATE INDEX clause and they are automatically created f... - https://man.mtool.work/duckdb/1.3/sql/indexes.html
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DuckDB 1.3 Documentation / man.mtool.work