Data Disaster Recovery Method, Apparatus, and System, Node Device, and Standby Node Device

A data disaster recovery method, applied to any node device in a primary cluster, wherein the primary cluster is located in a database disaster recovery system, and the database disaster recovery system comprises the primary cluster and a disaster recovery cluster;

• and the method comprises:
• in a data synchronization process, determining, based on a page modification information bitmap of the node device, a to-be-synchronized page on which data modification is performed in the node device, wherein the page modification information bitmap indicates a page address of a page on which data modification is performed in the node device;
• replicating data of the to-be-synchronized page;
• and
• sending a page address of the to-be-synchronized page and the data of the to-be-synchronized page to a standby node device corresponding to the node device, wherein the standby node device is a device in the disaster recovery cluster.

A data disaster recovery apparatus, used in any node device in a primary cluster, wherein the primary cluster is located in a database disaster recovery system, and the database disaster recovery system comprises the primary cluster and a disaster recovery cluster;

• and the apparatus comprises a processor, a memory, wherein the memory is configured to store an instruction, and the processor is configured to invoke the instruction in the memory to:
• in a data synchronization process, determine, based on a page modification information bitmap of the node device, a to-be-synchronized page on which data modification is performed in the node device, wherein the page modification information bitmap indicates a page address of a page on which data modification is performed in the node device;
• and
• replicate data of the to-be-synchronized page, and send a page address of the to-be-synchronized page and the data of the to-be-synchronized page to a standby node device corresponding to the node device, wherein the standby node device is a device in the disaster recovery cluster.

A data disaster recovery apparatus, used in any standby node device in a disaster recovery cluster, wherein the disaster recovery cluster is located in a database disaster recovery system, and the database disaster recovery system comprises a primary cluster and the disaster recovery cluster;

• and the apparatus comprises a processor, a memory, wherein the memory is configured to store an instruction, and the processor is configured to invoke the instruction in the memory to:
• receive, in a data synchronization process, a page address of a to-be-synchronized page and data of the to-be-synchronized page that are sent by a node device corresponding to the standby node device, wherein the node device is a device in the primary cluster, and the to-be-synchronized page is a page on which data modification is performed and that is determined based on a page modification information bitmap of the node device;
• and
• store the data of the to-be-synchronized page into an external memory of the standby node device based on the page address of the to-be-synchronized page.