To ensure that the source database is compatible with Azure SQL Database using the Data Migration Assistant (DMA). SQL Database V12 is approaching feature parity with SQL Server, other than issues related to server-level and cross-database operations. Databases and applications that rely on partially supported or unsupported functions need some re-engineering to fix these incompatibilities before the SQL Server database can be migrated.
Users cannot afford to remove your SQL Server database from production while the migration is occurring, we can use SQL Server transactional replication as your migration solution. To use this method, the source database must meet the requirements for transactional replication and be compatible for Azure SQL Database.
To use this solution, configure Azure SQL Database as a subscriber to the SQL Server instance that wish to migrate. The transactional replication distributor synchronizes data from the database to be synchronized (the publisher) while new transactions continue to occur.
With transactional replication, all changes to data or schema show up in Azure SQL Database. Once the synchronization is complete and we are ready to migrate, change the connection string of your applications to point them to our Azure SQL Database. Once transactional replication drains any changes left on your source database and all your applications point to Azure DB, you can uninstall transactional replication. Your Azure SQL Database is now your production system.
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