Load data from Amazon Redshift
This section describes how to connect Amazon Redshift with Exasol and then load data.
To view details about data type mappings or to migrate data, see the Amazon Redshift to Exasol migration script in our GitHub repository.
Download driver
Download the compatible JDBC 4.2 driver from AWS Documentation.
Configure driver in EXAoperation
Do the following to configure the driver in EXAoperation:
- Log in to EXAoperation user interface as an Administrator user.
- Select Configuration > Software and click the JDBC Drivers tab.
- Click Add to add the JDBC driver details.
- Enter the following details for the JDBC properties:
- Driver Name: Redshift
- Main Class: com.amazon.redshift.jdbc42.Driver
- Prefix: jdbc:redshift:
- Disable Security Manager: Check the box to disable the security manager. This allows the JDBC Driver to access certificate and additional information.
- Comment: This is an optional field.
- Click Add to save the settings.
- Select the radio button next to the driver from list of JDBC driver.
- Click Choose File to locate the downloaded driver and click Upload to upload the JDBC driver.
Run statement
We recommend that you create a connection string. For example:
CREATE CONNECTION jdbc_connection_1
TO 'jdbc:redshift://example_cluster123.some_region.redshift.amazonaws.com:5439/dev'
USER 'awsuser'
IDENTIFIED BY'some_password';
To check the connection, run the following statement.
Load data
You can use the IMPORT statement to load data using the connection you created above. IMPORT supports loading data from a table or a SQL statement.
Troubleshooting error messages
Error message 1
[ETL-5] JDBC-Client-Error: Connecting to 'jdbc:redshift://example_cluster123.some_region.redshift.amazonaws.com:5439/dev' as user='awsuser' failed: [Amazon](500150) Error setting/closing connection: Error loading the keystore . (Session: 1622834984232180908)
Solution
Ensure that you have selected the Disable Security Manager in EXAoperation as mentioned in Configure driver in EXAoperation.
Error message 2
[ETL-5] JDBC-Client-Error: Connecting to 'jdbc:redshift://example_cluster123.some_region.redshift.amazonaws.com:5439/dev' as user='awsuser' failed: [Amazon](500150) Error setting/closing connection: Connection timed out. (Session: 1622834984232180908)
Solution
Check that the security groups on the Redshift side allow your VM/cluster to connect to Redshift.
Error message 3
[ETL-5] JDBC-Client-Error: Connecting to 'jdbc:redshift://example_cluster123.some_region.redshift.amazonaws.com:5439/dev' as user='awsuser' failed: [Amazon](500150) Error setting/closing connection: UnknownHostException. (Session: 1622834984232180908)
Solution
Ensure that a DNS server is configured
Error message 4
[ETL-5] JDBC-Client-Error: Connecting to 'jdbc:redshift://example_cluster123.some_region.redshift.amazonaws.com:5439/dev' as user='awsuser' failed: SSL error: PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
Solution
Add ;ssl=false to the connection string. For example:
jdbc:redshift://example_cluster123.some_region.redshift.amazonaws.com:5439/dev;ssl=false