For which database engine does Era support rolling back a patch using CLI?

Nutanix Era provides a dedicated command-line interface (CLI) feature to roll back a patch for Oracle database servers. This operation leverages a pre-patch snapshot of the Oracle Home to revert the database server to its state before the patch was applied. This functionality is specific to the complexities of Oracle patching and is not available for other database engines like PostgreSQL, Microsoft SQL Server, or MongoDB through a dedicated Era rollback command. For other engines, restoration from a pre-patch snapshot is the alternative method.

A. Era does not provide a specific CLI command to roll back a patch for PostgreSQL; a database restore would be required.
C. Era does not offer a dedicated patch rollback command for Microsoft SQL Server via the CLI.
D. Era does not have a specific CLI command for rolling back patches on MongoDB database servers.

1. Nutanix Era 2.5 User Guide, "Patching an Oracle Database," Section: "Roll Back an Oracle Database Patch". This section explicitly describes the procedure and notes, "You can roll back a patch that you have applied to an Oracle database."

2. Nutanix Era 2.5 CLI Guide, "era-cli dbserver," Command: patch rollback. The documentation for the Era Command-Line Interface details the patch rollback command and its parameters, specifying its use for Oracle database servers. The command syntax is era-cli dbserver patch rollback --dbservername .