Help Center> Data Replication Service> User Guide (Paris Region) > Troubleshooting> Solutions to Failed Check Items> Database Versions> Checking Whether the Migration Is from an Earlier Database Version to the Same or a Later Version

Updated on 2023-01-05 GMT+08:00

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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: 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, and 13.0 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, and 13.0 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: 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.

MongoDB Migration

**Table 3** Checking Whether the Source Database Version Is Supported
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. The destination database version can be 4.0.x or later. The migration must be performed from an older database version to the same or a newer version Check whether the features of the newer version are used in the source database. If the new features are not supported in the destination database, the synchronization may fail.
Failure Cause and Handling Suggestion	Item to be confirmed: The versions of the source and destination databases are different. Potential problem: The source database version is 4.4.5 and the destination database version is 4.0.3, which does not comply with the migration version requirements. If the source database supports features of the newer version but the destination database does not, the synchronization may fail.
Failure Cause and Handling Suggestion	Failure cause: The destination database version does not meet the requirements. Handling suggestion: Select version 4.0.x for the destination database because the source database version is later than 4.0.x and the destination database version is 3.4.x.

Parent topic: Database Versions

Previous topic: Checking Whether the Destination Database Version Is Supported

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