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If the data stored on the primary ApsaraDB RDS for SQL Server instance is no more than 16 TB, read-only RDS instances can be created for the primary RDS instance within minutes regardless of the size of data stored on the primary RDS instance. This shortens the creation time of read-only RDS instances from several hours or days to minutes. The fast initialization of read-only RDS instances does not affect the I/O performance of their primary RDS instance. This ensures the stable performance of the primary RDS instance. You can use fast initialization to create read-only RDS instances at any time. You can release the created read-only RDS instances at any time after you use them. This helps reduce the costs of retaining read-only RDS instances for a long period of time.