![]() As an alternative you can use psql command line interface to unload table directly to the local system.įor more details, follow my other article, Export Redshift Table Data to Local CSV format. You cannot use unload command to export file to local, as of now it supports only Amazon S3 as a destination. Iam_role 'arn:aws:iam::123456789012:role/myRedshiftRole' Unload Redshift Table to Local System You should provide option HEADER to export results with header. You can query these columns using Redshift Spectrum or ingest them back to Amazon Redshift using the COPY command. Contact Informatica Support to get the EBF. For version 10.2.2 ServicePack 1, an emergency bug fix (EBF-14484) is also available to include this feature. This enables semistructured data to be represented in Parquet. Solution In Enterprise Data Catalog (EDC) 10.2.2 HotFix 1, multiple Unload Options property can be passed for the Redshift Profile scanner in EDC 10.2.2 HotFix 1. Amazon Redshift represents SUPER columns in Parquet as the JSON data type. Iam_role 'arn:aws:iam::123456789012:role/myRedshiftRole' Unload Redshift Query Results with Header You can unload tables with SUPER data columns to Amazon S3 in the Parquet format. However, It is recommended to set PARALLEL to TRUE.įor example, unload ('SELECT * from warehouse') In order to unload results to a single file, you should set PARALLEL to FALSE. Unload Redshift Query Results to a Single File As unload command export the results in parallel, you may notice multiple files in the given location. The command will unload the warehouse table to mentioned Amazon S3 location. We can unload Redshift data to S3 in Parquet format directly. Parquet format is up to 2x faster to unload and consumes up to 6x less storage in Amazon S3, compared with text formats. Welcome to the documentation for Apache Parquet. 2 Answers Sorted by: 4 Spark is not needed anymore. Iam_role 'arn:aws:iam::123456789012:role/myRedshiftRole' You can unload the result of an Amazon Redshift query to your Amazon S3 data lake in Apache Parquet, an efficient open columnar storage format for analytics. However, you can always use DELIMITER option to override default delimiter. ![]() The meta key contains a contentlength key with a value that is the actual size of the file in bytes. ]įollowing is the example to unload warehouse table to S3. For example, the following UNLOAD manifest includes a meta key that is required for an Amazon Redshift Spectrum external table and for loading data files in an ORC or Parquet file format. You can provide one or many options to unload command. UNLOAD ('select-statement')įollowing are the options. You will have to use AWS CLI commands to download created file.įollowing is the unload command syntax. It does not unload data to a local system. Unload command unloads query results to Amazon S3. ![]()
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