...两处处所被专门用于储存安放数据字典1个处所就是数据字典缓存(Data Dictionary Cache)数据字典缓存也被称为行缓存(Row Cache),因为它是以记载举动单位储存数据的,而不像Buffer Cache是以数据块为单位储存数据内存中别的1个储存数据字典的处所是库缓存所有...
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The second change was adding another write-through Row Cache containing database records: users and tweets.
第二个改动是加入另一个直写式行缓存,它包含了数据库记录:用户和tweets。
It works by retrieving the data row information that the reader transaction needs from the DB2 logs-usually from the log's memory cache, which is very fast.
它采用的方法是从DB 2日志(常常是从非常快速的日志内存缓存)中获取读者事务需要的数据行。
When a change occurs in the table or in a specific row, the item that has a dependency is invalidated and removed from the cache.
当资料表或特定资料列发生变更时,具有相依性的项目便会失效并且自快取中移除。
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