Checking Whether the Migration Is from an Earlier Database Version to the Same or a Later Version

MySQL Migration

**Table 1** Checking whether the migration is from an earlier database version to the same or a later version
Check Item	Whether the migration is from an earlier database version to the same or a later version
Description	Check whether the source database version is earlier than or the same as the destination database version.
Failure Cause and Handling Suggestion	Failure cause: This item cannot be checked because the source database fails to be connected. Handling suggestion: Check whether the source database is connected.
	Failure cause: This item cannot be checked because the destination database fails to be connected. Handling suggestion: Check whether the destination database is connected.
	Failure cause: The source database version is not supported. Handling suggestion: Check whether the source database version is supported. Currently, only MySQL 5.5.x, MySQL 5.6.x, and MySQL 5.7.x are supported.
	Failure cause: The destination database version is not supported. Handling suggestion: Check whether the destination database version is supported. Currently, only MySQL 5.6.x, and MySQL 5.7.x are supported.
	Failure cause: An internal error occurs. Handling suggestion: Contact technical support.
	Failure cause: Insufficient user permissions Handling suggestion: Check whether the database user permissions meet the migration requirements.
	Failure cause: The destination database version must be the same as or later than the source database version. Handling suggestion: Ensure the source database version is earlier than or the same as the destination database version.

PostgreSQL Synchronization

**Table 2** Checking whether the migration is from an earlier database version to the same or a later version
Check Item	Whether the migration is from an earlier database version to the same or a later version
Description	Check whether the source database version is earlier than or the same as the destination database version.
Failure Cause and Handling Suggestion	Failure cause: This item cannot be checked because the source database fails to be connected. Handling suggestion: Check whether the source database is connected.
	Failure cause: This item cannot be checked because the destination database fails to be connected. Handling suggestion: Check whether the destination database is connected.
	Failure cause: Insufficient user permissions Handling suggestion: Check whether the database user permissions meet the migration requirements.
	Failure cause: The source database version is not supported. Handling suggestion: Check whether the source database version is supported. Currently, only PostgreSQL 9.4, 9.5, 9.6, 10.0, 11.0, 12.0, 13.0, and PostgreSQL Enhanced Edition are supported.
	Failure cause: The destination database version is not supported. Handling suggestion: Check whether the destination database version is supported. Currently, only PostgreSQL 9.5, 9.6, 10.0, 11.0, 12.0, 13.0, and PostgreSQL Enhanced Edition are supported.
	Failure cause: The major versions of the source and destination databases must be the same and the minor version of the source database must be less than or equal to that of the destination database. Handling suggestion: Ensure the source database version is earlier than or the same as the destination database version.
	Failure cause: If the source database is an RDS PostgreSQL Enhanced Edition instance, the destination database can only be an RDS PostgreSQL Enhanced Edition instance. Handling suggestion: Select RDS PostgreSQL Enhanced Edition instance as the destination database.
	Failure cause: An internal error occurs. Handling suggestion: Contact technical support.
	Failure cause: The destination database version and source database version do not meet the requirements of the selected migration mode. Handling suggestion: Check whether the versions of the destination database and source database meet the migration mode requirements.