Database migration method, apparatus, device, and computer-readable medium

A computer-readable medium, wherein the computer-readable medium stores computer-readable instructions, which when executed by a processor enable the processor to implement acts including:

• copying metadata from a first server of a database to a second server of the database, the metadata including identification information of synthetic data;
• receiving, by the second server, a service instruction sent by a client after the copying the metadata from the first server of the database;
• determining, by the second server and based on the service instruction, whether the synthetic data needs to be retrieved from the first server of the database;
• in response to it is determined that the synthetic data needs to be retrieved from the first server of the database, requesting, by the second server, to copy the synthetic data of the database from the first server by sending the identification information of the synthetic data to the first server;
• and
• copying the synthetic data from the first server of the database to the second server based on the identification information of the synthetic data sent by the second server.

A database migration device, comprising a memory storing executable instructions and a processor configured to execute the executable instructions, thereby implementing acts including:

• copying metadata from a first server of a database to a second server of the database, the metadata including identification information of synthetic data;
• receiving, by the second server, a service instruction sent by a client after the copying the metadata from the first server of the database;
• determining, by the second server and based on the service instruction, whether the synthetic data needs to be retrieved from the first server of the database;
• in response to it is determined that the synthetic data needs to be retrieved from the first server of the database, requesting, by the second server, to copy the synthetic data of the database from first server by sending the identification information of the synthetic data to the first server;
• and
• copying the synthetic data from the first server of the database to the second server based on the identification information of the synthetic data sent by the second server.

A data base system, comprising:

• a first server of a database;
• and
• a second server of the database, the second server configured to implement a database migration operation including actions of:
• copying metadata from the first server of the database to the second server of the database, the metadata including identification information of synthetic data;
• receiving a service instruction sent by a client after the copying the metadata from the first server of the database;
• determining, based on the service instruction, whether the synthetic data needs to be retrieved from the first server of the database;
• in response to determining that the synthetic data needs to be retrieved from the first server of the database, requesting to copy the synthetic data of the database from the first server by sending the identification information of the synthetic data to the first server;
• and
• copying the synthetic data from the first server of the database to the second server based on the identification information of the synthetic data.