Data synchronization method, apparatus, and system

Abstract

A determination is made, by a first device, that data in a first database is modified. The first database is associated with the first device. A notification is generated by the first device. The notification includes information associated with the data modification in the first database. The notification is transmitted by the first device to at least one second device. At least one second database is associated with the at least one second device.

1 .- 20 . (canceled) 
     
     
         21 . A computer-implemented method, comprising:
 determining, by a first device, that data in a first database is modified, wherein the first database is associated with the first device;   generating, by the first device, a notification, wherein the notification includes an operation identifier associated with the data modification in the first database;   transmitting, by the first device, the notification to at least one second device, wherein at least one second database is associated with the at least one second device;   monitoring, by the at least one second device, the at least one second database based on the operation identifier; and   in response to detecting, by the at least one second device, a synchronization operation corresponding to the operation identifier in the at least one second database, updating, by the at least one second device, at least one cache associated with the at least one second database based on synchronized data of the synchronization operation in the at least one second database.   
     
     
         22 . The computer-implemented method of  claim 21 , wherein the data modification in the first database is to be synchronized in the at least one second database. 
     
     
         23 . The computer-implemented method of  claim 21 , wherein the notification is a real-time notification, and wherein the real-time notification is transmitted to the at least one second device once the real-time notification is generated by the first device. 
     
     
         24 . The computer-implemented method of  claim 21 , wherein generating, by the first device, the notification includes:
 determining that a size of the data modification does exceed a predetermined threshold; and   in response to a determination that the size of the data modification does exceed the predetermined threshold, generating the notification to include the operation identifier associated with the data modification in the first database.   
     
     
         25 . The computer-implemented method of  claim 21 , wherein the data modification in the first database includes a data write operation, and wherein the operation identifier includes a sequence number or an identifier character string of the data write operation. 
     
     
         26 . The computer-implemented method of  claim 21 , wherein the first database is a write database and the at least one second database is a read database. 
     
     
         27 . The computer-implemented method of  claim 21 , further comprising synchronizing the at least one second database with the first database after the data modification in the first database is completed. 
     
     
         28 . A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:
 determining, by a first device, that data in a first database is modified, wherein the first database is associated with the first device;   generating, by the first device, a notification, wherein the notification includes an operation identifier associated with the data modification in the first database;   transmitting, by the first device, the notification to at least one second device, wherein at least one second database is associated with the at least one second device;   monitoring, by the at least one second device, the at least one second database based on the operation identifier; and   in response to detecting, by the at least one second device, a synchronization operation corresponding to the operation identifier in the at least one second database, updating, by the at least one second device, at least one cache associated with the at least one second database based on synchronized data of the synchronization operation in the at least one second database.   
     
     
         29 . The non-transitory, computer-readable medium of  claim 28 , wherein the data modification in the first database is to be synchronized in the at least one second database. 
     
     
         30 . The non-transitory, computer-readable medium of  claim 28 , wherein the notification is a real-time notification, and wherein the real-time notification is transmitted to the at least one second device once the real-time notification is generated by the first device. 
     
     
         31 . The non-transitory, computer-readable medium of  claim 28 , wherein generating, by the first device, the notification includes:
 determining that a size of the data modification does exceed a predetermined threshold; and   in response to a determination that the size of the data modification does exceed the predetermined threshold, generating the notification to include the operation identifier associated with the data modification in the first database.   
     
     
         32 . The non-transitory, computer-readable medium of  claim 28 , wherein the data modification in the first database includes a data write operation, and wherein the operation identifier includes a sequence number or an identifier character string of the data write operation. 
     
     
         33 . The non-transitory, computer-readable medium of  claim 28 , wherein the first database is a write database and the at least one second database is a read database. 
     
     
         34 . The non-transitory, computer-readable medium of  claim 28 , the operations further comprising synchronizing the at least one second database with the first database after the data modification in the first database is completed. 
     
     
         35 . A computer-implemented system, comprising:
 one or more computers; and   one or more computer memory devices interoperably coupled with the one or more computers and having tangible, non-transitory, machine-readable media storing one or more instructions that, when executed by the one or more computers, perform one or more operations comprising:
 determining, by a first device, that data in a first database is modified, wherein the first database is associated with the first device; 
 generating, by the first device, a notification, wherein the notification includes an operation identifier associated with the data modification in the first database; 
 transmitting, by the first device, the notification to at least one second device, wherein at least one second database is associated with the at least one second device; 
 monitoring, by the at least one second device, the at least one second database based on the operation identifier; and 
 in response to detecting, by the at least one second device, a synchronization operation corresponding to the operation identifier in the at least one second database, updating, by the at least one second device, at least one cache associated with the at least one second database based on synchronized data of the synchronization operation in the at least one second database. 
   
     
     
         36 . The computer-implemented system of  claim 35 , wherein the data modification in the first database is to be synchronized in the at least one second database. 
     
     
         37 . The computer-implemented system of  claim 35 , wherein the notification is a real-time notification, and wherein the real-time notification is transmitted to the at least one second device once the real-time notification is generated by the first device. 
     
     
         38 . The computer-implemented system of  claim 35 , wherein generating, by the first device, the notification includes:
 determining that a size of the data modification does exceed a predetermined threshold; and   in response to a determination that the size of the data modification does exceed the predetermined threshold, generating the notification to include the operation identifier associated with the data modification in the first database.   
     
     
         39 . The computer-implemented system of  claim 35 , wherein the data modification in the first database includes a data write operation, and wherein the operation identifier includes a sequence number or an identifier character string of the data write operation. 
     
     
         40 . The computer-implemented system of  claim 35 , further comprising synchronizing the at least one second database with the first database after the data modification in the first database is completed.