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Data Transmission Service:FAQ about precheck

Last Updated:Aug 12, 2025

This topic provides answers to frequently asked questions about PolarDB for Orac during the precheck process.

Why does the account of my destination database have insufficient permissions to migrate data?

  • Problem description

    The account of the destination database does not have sufficient permissions.

  • Cause

    You set the Username parameter to a standard account for the destination database when you created a migration project.

  • Solution

    Create another migration project. Set the Username parameter to a privileged account for the destination database. Then, set the Password parameter to a password for the privileged account.

    Note

    You can create a privileged account in the console of the destination database instance. For more information, see Create a database account.

Why is the specified database version in a database evaluation project inconsistent with the actual database version?

  • Cause

    • If you use the latest destination database version and Advanced Database & Application Migration (ADAM) cannot evaluate this version, ignore this issue.

    • If the destination database version is earlier than the evaluation version, go to the console of the destination database to upgrade the version. Then, perform the precheck again.

      Note

      This is not an urgent issue that may cause data migration failure. You can ignore this issue if you have a tight schedule.

  • Solution

    1. Create a project to evaluate the destination database.

    2. Create a migration project and select the project created in Step a.

Why is the character encoding of the destination database different from that of the source database?

  • Cause

    In the precheck prompt message, the character encoding of the destination database is provided. The message prompts you to check whether the character encoding of the destination database is the same as that of the source database.

  • Solution

    • If the character encoding of the destination database is the same as that of the source database, ignore this issue.

    • If the character encoding of the destination database is different from that of the source database, change the character encoding of the destination database to the character encoding of the source database in the console of the destination database.

Why is the system time of the source database different from that of the destination database?

  • Cause

    In the precheck prompt message, the current system time of the destination database is provided. The message prompts you to check whether the system time of the source database is the same as that of the destination database.

  • Solution

    • If the system time of the source database is the same as that of the destination database, ignore this issue.

    • If the system time of the source database is different from that of the destination database, modify the system time of the source database or the destination database based on your business requirements.

Why are the resources of the destination database insufficient?

  • Cause

    The disk capacity of the destination database is insufficient.

  • Solution

    Increase the storage capacity of the destination database.