Abstract: A data writing device capable of dynamically switching between a write-through mode and a write-behind mode for writing transaction data into a disk including: a memory with a queue management table for managing a write disk queue and a write memory queue to store the transaction data; means for registering the write memory queue in the table when load exceeds a predetermined threshold value, and for deleting the write memory queue in the table when the load is below the predetermined threshold value; means for receiving the transaction data stored in the write disk queue, and writing the received transaction data into the disk; and means for receiving the transaction data stored in the write disk queue, and writing the received transaction data into a redundant memory.

Abstract: A data writing device capable of dynamically switching between a write-through mode and a write-behind mode for writing transaction data into a disk including: a memory with a queue management table for managing a write disk queue and a write memory queue to store the transaction data; means for registering the write memory queue in the table when load exceeds a predetermined threshold value, and for deleting the write memory queue in the table when the load is below the predetermined threshold value; means for receiving the transaction data stored in the write disk queue, and writing the received transaction data into the disk; and means for receiving the transaction data stored in the write disk queue, and writing the received transaction data into a redundant memory.