Abstract: A whole-airspace satellite search method and device based on a phased array antenna are provided. The present disclosure combines electronic scanning implemented by the phased array antenna with mechanical scanning implemented by a mechanical actuator. As for low-orbit satellite communication, the present disclosure achieves rapid search and aiming through the phased array antenna, and solves the problem of limited electronic scanning angle of the phased array antenna through a servo system of the mechanical actuator. On the other hand, the present disclosure supports whole-airspace search and aiming of high, medium, and low-orbit satellites through the combination of the electronic scanning implemented by the phased array antenna and the mechanical scanning implemented by the mechanical actuator.

Abstract: The present disclosure discloses an online index rebuilding method and apparatus, where the method includes: receiving an online index rebuilding request; adding a schema shared lock to a data table corresponding to an identifier of the data table; obtaining a latch and obtaining a structure control right of the data table; reserving storage space of a shadow index for an original index, allocating an entry address of the shadow index, and adding the entry address of the shadow index to a root page of the data table; releasing the latch; building the shadow index in the storage space of the shadow index; updating an index entry address on the root page of the data table to the entry address of the shadow index after the latch is obtained again; and releasing the latch obtained again and the schema shared lock. Therefore, efficiency of online index rebuilding is improved.