| 摘要 |
PROBLEM TO BE SOLVED: To improve a hit rate of a cache while evading temporal concentration of loads, in retrieval of posted information of microblogs or the like in which newness of information is demanded.SOLUTION: In retrieval of posted information of microblogs or the like in which newness of information is demanded, the reference time (typically a time stamp to be the end, however it may be the start or the like) of a cache effective period is shifted and determined for each group on the basis of the hash value (may be a part of the hash value like the upper one digit of MD5 for instance) of a keyword. Thus, even when the cache effective period is prolonged, the timing of cache update is dispersed and retrieval processing loads are not temporally concentrated. Thus, a hit rate of a cache is improved while evading temporal concentration of loads. |
