🧩 PostgreSQL

This data destination connector sends data to a PostgreSQL database.

Configuration

Create a new configuration of the PostgreSQL data destination connector.

The first step is to Set Up Database Credentials. You need to provide a host name, user name, password, database name, and schema.

We highly recommend that you create dedicated credentials for the connector in your database. You can use the following SQL code to get started:

CREATE SCHEMA writer_sample;
CREATE USER writer_sample WITH PASSWORD 'Writer_sample1';
GRANT ALL ON SCHEMA writer_sample TO writer_sample;
ALTER SCHEMA writer_sample OWNER TO writer_sample;
ALTER USER writer_sample SET search_path TO writer_sample;

It is also possible to secure the connection using an SSH tunnel.

Table Configuration

The next step is to configure the tables you want to write. Click Add New Table and select an existing table from Storage:

The next step is to specify table configuration. Use the preview icon to peek at the column contents.

For each column you can specify its

• name in the destination database; you can also use the select box in the table header to bulk convert the case of all names.
• data type (one of PostgreSQL data types); you can also use the select box in the table header to bulk set the type for all columns. Setting the data type to IGNORE means that column will not be present in the destination table.
• nullable; when checked, the column will be marked as nullable and empty values ('') in that column will be converted to NULL. Use this for non-string columns with missing data.
• default value; the provided value will be set as the default value of the column in the target table.

When done configuring the columns, don’t forget to save the settings.

Load Options

At the top of the page, you can specify the target table name and additional load options. There are two main options how the connector can write data to tables --- Full Load and Incremental Load.

In the Incremental Load mode, the data are bulk inserted into the destination table and the table structure must match (including the data types). That means the structure of the target table will not be modified. If the target table doesn’t exist, it will be created. If a primary key is defined on the table, the data is upserted. If no primary key is defined, the data is inserted.

In the Full Load mode, the table is completely overwritten including the table structure. The table is removed using the DROP command and recreated. The DROP command needs to acquire a table-level lock. This means that if the database is used by other applications which acquire table-level locks, the connector may freeze waiting for the locks to be released. This will be recorded in the connector logs with a message similar to this:

Table "account" is locked by 1 transactions, waiting for them to finish

Additionally, you can specify a Primary key of the table, a simple column Data filter, and a filter for incremental processing.