Querying data in a datashare in Amazon Redshift - Amazon Redshift
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Querying data in a datashare in Amazon Redshift

With Amazon Redshift, you can query data across datashares from producer clusters to securely access live data without copying or transferring it. The following section covers querying datashares in your Amazon Redshift environment.

Users and roles with permissions on consumer databases and schemas on consumer clusters can explore and navigate the metadata of any shared objects. They can also explore and navigate local objects in a consumer cluster. To do this, they use JDBC or ODBC drivers or SVV_ALL and SVV_REDSHIFT views.

Producer clusters might have many schemas in the database, tables, and views within each schema. The users on the consumer side can see only the subset of objects that are made available through the datashare. These users can't see the entire metadata from the producer cluster. This approach helps provide granular metadata security control with data sharing.

You continue to connect to local cluster databases. But now, you can also read from the databases and schemas that are created from the datashare using the three-part database.schema.table notation. You can perform queries that span across any and all databases that are visible to you. These can be local databases on the cluster or databases created from the datashares. Consumer clusters can't connect to the databases created from the datashares.

You can access the data using full qualification. For more information, see Cross-database query examples.

SQL
SELECT * FROM sales_db.public.tickit_sales_redshift ORDER BY 1,2 LIMIT 5;

 salesid | listid | sellerid | buyerid | eventid | dateid | qtysold | pricepaid | commission |      saletime
---------+--------+----------+---------+---------+--------+---------+-----------+------------+---------------------
       1 |      1 |    36861 |   21191 |    7872 |   1875 |       4 |    728.00 |     109.20 | 2008-02-18 02:36:48
       2 |      4 |     8117 |   11498 |    4337 |   1983 |       2 |     76.00 |      11.40 | 2008-06-06 05:00:16
       3 |      5 |     1616 |   17433 |    8647 |   1983 |       2 |    350.00 |      52.50 | 2008-06-06 08:26:17
       4 |      5 |     1616 |   19715 |    8647 |   1986 |       1 |    175.00 |      26.25 | 2008-06-09 08:38:52
       5 |      6 |    47402 |   14115 |    8240 |   2069 |       2 |    154.00 |      23.10 | 2008-08-31 09:17:02

You can only use SELECT statements on shared objects. However, you can create tables in the consumer cluster by querying the data from the shared objects in a different local database.