Data synchronization method, apparatus, and system

1. 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 real-time notification for the data modification, wherein the real-time notification includes information associated with the data modification in the first database;

transmitting, by the first device, the real-time notification to at least one second device once the real-time notification is generated by the first device, wherein at least one second database is associated with the at least one second device;

initiating synchronization of the at least one second database with the first database after the data modification in the first database is completed;

receiving, by the at least one second device, the real-time notification from the first device; and

updating, by the at least one second device, at least one cache based on the received real-time notification before the synchronization of the at least one second database is completed, wherein the at least one cache is associated with the at least one second database, and wherein updating the at least one cache includes:

in response to determining that the real-time notification includes the data modification, directly updating the at least one cache based on the data modification included in the real-time notification, wherein directly updating the at least one cache based on the data modification included in the real-time notification is performed before the at least one second database is synchronized with the data modification in the first database.

2. The computer-implemented method of claim 1 , wherein the data modification in the first database is to be synchronized in the at least one second database.

3. The computer-implemented method of claim 1 , wherein generating, by the first device, the real-time notification includes:

determining whether a size of the data modification exceeds a predetermined threshold;

in response to a determination that the size of the data modification does not exceed the predetermined threshold, generating the real-time notification to include the data modification; and

in response to a determination that the size of the data modification does exceed the predetermined threshold, generating the real-time notification to include an operation identifier associated with the data modification in the first database.

4. The computer-implemented method of claim 3 , wherein updating, by the at least one second device, the at least one cache based on the real-time notification includes:

in response to determining that the real-time notification includes the operation identifier associated with the data modification:

monitoring the at least one second database based on the operation identifier; and

when a synchronization operation corresponding to the operation identifier is detected in the at least one second database, updating the at least one cache based on synchronized data in the at least one second database.

5. 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 real-time notification for the data modification, wherein the real-time notification includes information associated with the data modification in the first database;

transmitting, by the first device, the real-time notification to at least one second device once the real-time notification is generated by the first device, wherein at least one second database is associated with the at least one second device;

initiating synchronization of the at least one second database with the first database after the data modification in the first database is completed;

receiving, by the at least one second device, the real-time notification from the first device; and

updating, by the at least one second device, at least one cache based on the received real-time notification before the synchronization of the at least one second database is completed, wherein the at least one cache is associated with the at least one second database, and wherein updating the at least one cache includes:

in response to determining that the real-time notification includes the data modification, directly updating the at least one cache based on the data modification included in the real-time notification, wherein directly updating the at least one cache based on the data modification included in the real-time notification is performed before the at least one second database is synchronized with the data modification in the first database.

6. The non-transitory, computer-readable medium of claim 5 , wherein the data modification in the first database is to be synchronized in the at least one second database.

7. The non-transitory, computer-readable medium of claim 5 , wherein generating, by the first device, the real-time notification includes:

determining whether a size of the data modification exceeds a predetermined threshold;

in response to a determination that the size of the data modification does not exceed the predetermined threshold, generating the real-time notification to include the data modification; and

in response to a determination that the size of the data modification does exceed the predetermined threshold, generating the real-time notification to include an operation identifier associated with the data modification in the first database.

8. The non-transitory, computer-readable medium of claim 7 , wherein updating, by the at least one second device, the at least one cache based on the real-time notification includes:

in response to determining that the real-time notification includes the operation identifier associated with the data modification:

monitoring the at least one second database based on the operation identifier; and

when a synchronization operation corresponding to the operation identifier is detected in the at least one second database, updating the at least one cache based on synchronized data in the at least one second database.

9. 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 real-time notification for the data modification, wherein the real-time notification includes information associated with the data modification in the first database;

transmitting, by the first device, the real-time notification to at least one second device once the real-time notification is generated by the first device, wherein at least one second database is associated with the at least one second device;

initiating synchronization of the at least one second database with the first database after the data modification in the first database is completed;

receiving, by the at least one second device, the real-time notification from the first device; and

updating, by the at least one second device, at least one cache based on the received real-time notification before the synchronization of the at least one second database is completed, wherein the at least one cache is associated with the at least one second database, and wherein updating the at least one cache includes:

in response to determining that the real-time notification includes the data modification, directly updating the at least one cache based on the data modification included in the real-time notification, wherein directly updating the at least one cache based on the data modification included in the real-time notification is performed before the at least one second database is synchronized with the data modification in the first database.

10. The computer-implemented system of claim 9 , wherein the data modification in the first database is to be synchronized in the at least one second database.

11. The computer-implemented system of claim 9 , wherein generating, by the first device, the real-time notification includes:

determining whether a size of the data modification exceeds a predetermined threshold;

in response to a determination that the size of the data modification does not exceed the predetermined threshold, generating the real-time notification to include the data modification; and

in response to a determination that the size of the data modification does exceed the predetermined threshold, generating the real-time notification to include an operation identifier associated with the data modification in the first database.

12. The computer-implemented system of claim 11 , wherein updating, by the at least one second device, the at least one cache based on the real-time notification includes:

in response to determining that the real-time notification includes the operation identifier associated with the data modification:

monitoring the at least one second database based on the operation identifier; and

when a synchronization operation corresponding to the operation identifier is detected in the at least one second database, updating the at least one cache based on synchronized data in the at least one second database.

13. The computer-implemented method of claim 1 , wherein the first database is a write database and the at least one second database is a read database.

14. The computer-implemented method of claim 1 , wherein the real-time notification is compressed, encrypted, or encoded before transmitted to the at least one second device.

15. The non-transitory, computer-readable medium of claim 5 , wherein the first database is a write database and the at least one second database is a read database.

16. The non-transitory, computer-readable medium of claim 5 , wherein the real-time notification is compressed, encrypted, or encoded before transmitted to the at least one second device.

17. The computer-implemented system of claim 9 , wherein the first database is a write database and the at least one second database is a read database.

18. The computer-implemented system of claim 9 , wherein the real-time notification is compressed, encrypted, or encoded before transmitted to the at least one second device.