Beijing OceanBase Technology Co., Ltd.

This specification provides a data storage method, a medium, an electronic device, and a program product. In this method, when processing to-be-written data, a server selects a data storage policy based on a condition of remaining target disk space. If the target disk space is sufficient, the server preferentially writes the data directly into the target disk space, and then uploads the data to an object storage system, to improve efficiency. If the target disk space is insufficient, the server reads a target file into an internal memory, performs a data append write operation in the internal memory, and directly uploads the target file from the internal memory to an object storage system after the data append write operation is completed, to avoid a data write exception due to the insufficient target disk space. Therefore, flexibility and reliability of data storage are improved.

Implementations of the present specification describe evicting a memory block in a cache, including determining a temperature index value of a memory block in a cache, where the memory block is a storage unit of the cache. Based on the temperature index value of the memory block in the cache, determining a to-be-evicted memory block that needs to be cleared in the cache. A target element in the to-be-evicted memory block is migrated to a target memory block in the cache, where the target memory block is a memory block that is retained in the cache and whose available storage space is greater than storage space required by the target element. The to-be-evicted memory block is deleted from the cache.

Implementations of the present specification describe evicting a memory block in a cache, including determining a temperature index value of a memory block in a cache, where the memory block is a storage unit of the cache. Based on the temperature index value of the memory block in the cache, determining a to-be-evicted memory block that needs to be cleared in the cache. A target element in the to-be-evicted memory block is migrated to a target memory block in the cache, where the target memory block is a memory block that is retained in the cache and whose available storage space is greater than storage space required by the target element. The to-be-evicted memory block is deleted from the cache.

Implementations of the present specification describe evicting a memory block in a cache, including determining a temperature index value of a memory block in a cache, where the memory block is a storage unit of the cache. Based on the temperature index value of the memory block in the cache, determining a to-be-evicted memory block that needs to be cleared in the cache. A target element in the to-be-evicted memory block is migrated to a target memory block in the cache, where the target memory block is a memory block that is retained in the cache and whose available storage space is greater than storage space required by the target element. The to-be-evicted memory block is deleted from the cache.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for writing data in one or more storage units. One of the methods includes obtaining an erasing count for each of multiple storage units, wherein the erasing count equals a total count of erasing operations that have been performed on all blocks of the storage unit. The method further includes identifying one or more of the storage units that satisfy one or more conditions associated with writing data, determining a storage unit that has the smallest erasing count among the identified storage units, and writing the data in the determined storage unit.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for writing data in one or more storage units. One of the methods includes obtaining an erasing count for each of multiple storage units, wherein the erasing count equals a total count of erasing operations that have been performed on all blocks of the storage unit. The method further includes identifying one or more of the storage units that satisfy one or more conditions associated with writing data, determining a storage unit that has the smallest erasing count among the identified storage units, and writing the data in the determined storage unit.