By Kathleen Ting, Jarek Jarcec Cecho
Integrating information from a number of assets is vital within the age of massive info, however it could be a difficult and time-consuming job. this convenient cookbook offers dozens of ready-to-use recipes for utilizing Apache Sqoop, the command-line interface program that optimizes info transfers among relational databases and Hadoop. Sqoop is either robust and bewildering, yet with this cookbook's problem-solution-discussion structure, you are going to speedy how one can installation after which follow Sqoop on your surroundings. The authors supply MySQL, Oracle, and PostgreSQL database examples on GitHub for you to simply adapt for SQL Server, Netezza, Teradata, or different relational structures.
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Extra info for Apache Sqoop Cookbook: Unlocking Hadoop for Your Relational Database
You can store the staging table in a different logical database (on the same physical box) or in a different file group. Some extended attributes do not make a difference to Sqoop: your target table might be partitioned whereas the staging table might not, or both tables might use different storage engines. Ultimately, it’s the user’s responsibility to make sure the data export is valid when the tables are not defined in exactly the same way. The staging table is not automatically created by Sqoop and must exist prior to starting the export process.
2. info | 41 additional drawback that you need to keep in mind when using large numbers of rows inserted with a single insert statement: most databases have limits on the maximum query size. The Sqoop export will fail if the remote database server does not accept the generated query. The third batching mechanism does not try to achieve better performance by putting multiple rows together as the previous two options did. transaction determines how many insert statements will be issued on the database prior to committing the transaction and starting a new one.
8. 11. Importing All Your Tables Problem You would like to import all tables from your database at once using one command rather than importing the tables one by one. Solution Rather than using the import tool for one table, you can use the import-all-tables tool. com/sqoop \ --username sqoop \ --password sqoop Discussion When using the import-all-tables tool, Sqoop will use catalog queries to retrieve a list of all tables in your database. Subsequently for each table, Sqoop will internally call the import tool to import your data to Hadoop.