Greenplum
Greenplum is a massively parallel processing (MPP) SQL database. It provides access to data in powerful server clusters within a single SQL interface.
watsonx.data on IBM Software Hub
watsonx.data Developer edition
Greenplum
Configure the following details for Greenplum:
| Field | Description |
|---|---|
| Display name | Enter the database name to be displayed on the screen. |
| Database name | Enter the name of your database. |
| Hostname | Enter the Hostname. |
| Port | Enter the Port number. |
| Username | Enter the Username. |
| Password | Enter the Password. |
| Port is SSL enabled | Use the toggle switch to enable or disable SSL connection. |
|
watsonx.data Developer edition Connection details: Arrow Flight |
Enter the following details for Arrow Flight service connection: Service hostname: Enter the service hostname. Port: Enter the port number. API key: Enter the API key. Token URL: Enter the token URL. Port is SSL enabled: Use the toggle switch to enable SSL connection. Validate server certificate: This option can be used when the host certificate is not signed by a known certificate authority. To validate that the SSL certificate returned by host is trusted, do the following steps: i. Use the toggle switch to validate the server certificate. ii. The Upload SSL certificate (.pem, or .crt) link is enabled. ii. Click the Upload SSL certificate (.pem, or .crt) link. iii. Browse the SSL certificate and upload. |
| Catalog name | Enter the name of the catalog. This catalog is automatically associated with your database. |
| Create | Click Create to create the database. |
Limitations for SQL statements
- For the database-based catalogs,
CREATE SCHEMA,CREATE TABLE,DROP SCHEMA,DROP TABLE,DELETE,DROP VIEW,ALTER TABLE, andALTER SCHEMAstatements are not available in the Data manager UI.
Limitations for data types
- When the fields of data type
REALhave 6 digits or more in the decimal part with the digits being predominately zero, the values when queried are rounded off. It is observed that the rounding off occurs differently based on the precision of the values. For example, a decimal number 1.654 when rounded to 3-digits after the decimal point are the same. Another example is 10.890009 and 10.89000. It is noticed that 10.89000 is rounded to 10.89, whereas 10.89009 is not rounded off. This is an inherent issue because of the representational limitations of binary floating point formats. This might have a significant impact when querying involves sorting.