The data gets copied multiple times among the disk, kernel buffer, and user buffer before it is finally delivered to the application.
数据在被最终传入到应用程序前,在磁盘、内核缓冲区和用户缓冲区中被拷贝了多次。
The compressed data is kept both on disk and memory and DB2 also compresses user data stored in log files, thereby reducing log file size.
被压缩的数据同时存放在磁盘上和内存中,DB2 还压缩存储在日志文件中的用户数据,以便减少日志文件大小。
The I/O might involve reading data from a disk, or a database, or a web service, or even from a user.
I/O 可能涉及到从一个磁盘、一个 web 服务或甚至是一名用户读取数据。
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