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Troubleshoot Precheck Failures

<p>This article describes how to fix precheck failures.</p> <p>1.&nbsp;&nbsp;<strong>Precheck item</strong>: Check for complicated topologies.</p> <p><strong>Precheck content</strong>: Verify that the source database and instances do not have any unsupported synchronization topology.</p> <p><strong>Reason</strong>: The migration task under precheck includes incremental migration, and the tables to be migrated in this task are contained in other incremental migration tasks.</p> <p><strong>Solution</strong>: Delete other tasks conflicting with the migration task under precheck. Before you perform a delete operation, make sure you understand its effect on your network.</p> <p>2.&nbsp;&nbsp;<strong>Precheck item</strong>: Check for tables in the target database.</p> <p><strong>Check content</strong>: Verify that the target database has requisite tables for the migration task.</p> <p><strong>Reason</strong>: You have not executed structure migration before full migration. Before you execute a full migration task, make sure the required structure exists in the target database.</p> <p><strong>Solutions</strong>: To resolve this issue, use one of following methods:</p> <ul> <li>Manually create a table structure in the target database.</li> <li>Modify the migration type and add structure migration to the task.</li> </ul>
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