对于长期运行的事务，常常需要创建容量更大的主日志。
For long-running transactions, often there is a need to create primary logs with bigger capacity.
对电子邮件日志进行解析以确定占用较大容量的用户，是进行这项处理工作的开始。
Parsing the e-mail logs to determine high-volume users is a good way to start that process.
大容量日志：要让任何日志系统确保日志是按事件顺序(于原始事件相同顺序)记载的或许是不可能的。
High Volume logging: it is probably impossible for any logging system to guarantee logs get written chronologically (in same order as the original events).
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