unload ( 'select from lineitem' ) to 's3://mybucket/lineitem/' iamrole 'arn:aws:iam::0123456789012:role/MyRedshiftRole' PARQUET PARTITION BY (lshipdate) INCLUDE In these cases, the lshipdate column is also in the data in the Parquet files. Also if you need you can get the s3 location and other parameters from the user input. In some cases, the UNLOAD command used the INCLUDE option as shown in the following SQL statement. If you don’t want to use this, you can remove these options from the unload_query. In this case, you must use the ESCAPE option with the UNLOAD statement. Then I used multiple options like parallel, max file size, include headers and compress. When you UNLOAD using a delimiter, your data can include that delimiter or any of the characters listed in the ESCAPE option description. Here, Im getting the table name from input. I have read the redshift documentation regarding unloading, but no answers other than it says sometimes it splits the table (I've never seen it not do that). Insert into unload_meta (tablename, start_time, end_time, export_query) values (v_tablename,starttime,endtime,unload_query) When I unload a table from amazon redshift to S3, it always splits the table into two parts no matter how small the table. ![]() S3_path:= 's3://bhuvi-datalake/clicksteam/' Sql:= 'select * from '||v_tablename|| '' UNLOAD then writes one file at a time, up to a maximum of 6.2 GB per file. To unload serially, specify PARALLEL OFF. ![]() Select extract( day from GETDATE()) into un_day unload ('select from venue') to 's3://mybucket/unload/' iamrole 'arn:aws:iam::0123456789012:role/MyRedshiftRole' maxfilesize 1 gb Unload VENUE serially. This program will need Redshift login credentials and not IAM credentials (Redshift username, password). ![]() Create a Python program that connects to Redshift, in a manner similar to other databases such as SQL Server, and execute your query. Select extract( month from GETDATE()) into un_month IAM credentials via an IAM Role to access the S3 bucket and Redshift ODBC credentials to execute SQL commands. LANGUAGE plpgsql AS $$ DECLARE starttime datetime īEGIN select extract( year from GETDATE()) into un_year CREATE OR REPLACE PROCEDURE sp_unload(v_tablename varchar)
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