Unimus can be deployed using an embedded file-based database (HSQL - only for small deployments), or a full dedicated DB.

You can find the full list of supported DB types and versions here.

Supported databases and versions

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Using this combination ensures better global language support and consistent case-insensitive behavior in text comparisons.

PostgreSQL details

Step by step for PostgreSQL migration:

Before you start with migration and for more information related to PostgreSQL we highly recommend to visit visit the official page: https://www.postgresql.org/docs/9.0/migration.html 

Upgrading PostgreSQL from Version 11 to 12+

• Prepare the new database:
  • Set up your new PostgreSQL 12+ instance where the data will be migrated.
• Stop both databases:
  • Make sure to stop both the old (PostgreSQL 11) and the new (PostgreSQL 12+) databases to avoid any conflicts during migration.

• Access PostgreSQL:

  • Log in to your old PostgreSQL 11 database and run the following commands:

    • ALTER TABLE backup SET WITHOUT OIDS;

    • ALTER TABLE push_output_group SET WITHOUT OIDS;

  • These commands ensure that tables containing OIDs are altered to be compatible with newer versions of PostgreSQL (tables no longer support OIDs in version 12+). No errors should occur when executing them.

• Pre-check the upgrade:

  • Run the following command to check if your system is ready for the upgrade:

    • pg_upgrade --check

  • This will confirm whether the upgrade can proceed without issues.
• Backup the old database:
  • Make sure to create a full dump of your old database for safekeeping, using the pg_dump command.

• Migrate the data:

  • After ensuring everything is in order, migrate your data from PostgreSQL 11 to 12+ using:

    • pg_upgrade

Upgrading PostgreSQL from Version 12 to 16

• Backup Your Old Database:
  • Before starting the migration, create a full dump of your old PostgreSQL 12 database. This step ensures you have a backup in case anything goes wrong during the upgrade process.

• Check Compatibility:

  • Ensure that both your old (PostgreSQL 12) and new (PostgreSQL 16) databases are compatible for migration. You can do this by running the following command:

    • pg_upgrade --check

  • This command will verify that the upgrade can proceed without any issues.

• Migrate the Data:

  • Once you have confirmed compatibility, you can proceed with the migration using:

    • pg_upgrade

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