Programing Reference For .Net,Java,C

  Start thinking a bit confused, not because of any other reason is because the front too chaotic. Write. 

  Cache biggest problem is how to control period. 

  1 practice: Active update.    When a new data entry or data update, delete the corresponding cache.    This advantage is that the data to date.    Defects is: cache determination more difficult, especially List; larger than the data update, a large number of data updates, will create a heavy burden. 

  Practice 2: passive updates, and the survival time of cache settings.    One is done Message Queue, a process of constant scanning of the queue to determine the cache should be deleted, and delete it.    Another is a call to the time of data cache, cache determine generated to decide whether or not to update data cache. 

Tags: PHP

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