| 摘要 |
The database schema managing method includes the steps of: if a memory allocation request is received, confirming whether a necessary memory is allocated and transmitting a response; if a schema alteration is requested, altering a schema, generating a log and transmitting a schema alteration completion message; if a schema restoration request is not received, transmitting the generated log and receiving a disk backup completion message; if there is the schema restoration request, restoring the schema to a previous state and transmitting a schema restoration completion message, thereby generating, erasing and altering a relation without stopping a system.
|
