Load data from PostgreSQL

Learn how to connect to a PostgreSQL database with Exasol and then load data.

To view details about data type mappings or to migrate data, see the PostgreSQL to Exasol migration script in our GitHub repository.

Prerequisites

  • The PostgreSQL server must be reachable from the Exasol system.

  • The user credentials in the connection must be valid.

Add JDBC driver

  1. Create a configuration file settings.cfg with the following settings:

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    DRIVERNAME=PostgreSQL
    PREFIX=jdbc:postgresql:
    FETCHSIZE=100000
    INSERTSIZE=-1
    NOSECURITY=YES

    The file must end with an empty line (line break followed by zero characters).

  2. Upload the settings.cfg file and the driver .jar file to BucketFS in the Exasol cluster.

    In Exasol 2025.1 and later you can upload files using Exasol Admin. You can also use any compatible file transfer tool, including curl on the command line. See also Manage files in BucketFS.

    In Exasol SaaS you must upload the driver through the web console.

    If the driver was downloaded as a .tar.gz or .zip archive, make sure that you extract and upload only the .jar file along with the settings.cfg file.

    Example (using curl in Linux):
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    export WRITE_PW=<your_bucketfs_write_password>
    export DATABASE_NODE_IP=<ip_address_of_cluster_node>
    export PORT=<bucketfs_port> # default: 2581

    curl -v --insecure -X PUT -T settings.cfg https://w:$WRITE_PW@$DATABASE_NODE_IP:$PORT/default/drivers/jdbc/exasol/settings.cfg
    curl -v --insecure -X PUT -T exajdbc.jar https://w:$WRITE_PW@$DATABASE_NODE_IP:$PORT/default/drivers/jdbc/exasol/exajdbc.jar

    The option --insecure or -k tells curl to bypass the TLS certificate check. This option allows you to connect to a HTTPS server that does not have a valid certificate. Only use this option if certificate verification is not possible and you trust the server.

Create connection

To create a connection, run the following statement. Replace the connection string and credentials as needed.

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CREATE OR REPLACE CONNECTION JDBC_POSTGRESQL
 TO 'jdbc:postgresql://192.168.99.100:5432/my_db'
 USER 'username'
 IDENTIFIED BY 'Exasoltest';

To test the connection, run the following statement.

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 SELECT * FROM 
 (IMPORT FROM JDBC AT JDBC_POSTGRESQL
   STATEMENT 'select ''Connection works'' '
  );

Load data

Use IMPORT to load data from a table or SQL statement using the connection that you created.