XML文件的长度 [英] Length of an XML file

问题描述

我有一个大小为31 GB的XML文件.我需要找到该文件中的总行数.我知道命令wc -l会给我同样的效果.但是，执行此操作花费的时间太长.有没有更快的机制来查找大文件中的行数?

I have an XML file of size 31 GB. I need to find the total number of lines in that file. I know the command wc -l will give me the same. However it's taking too long to perform this operation. Is there any faster mechanism to find the number of lines in a large file?

推荐答案

31个演出是一个非常大的文本文件.我敢打赌它会压缩到约1.5个演出.我将以压缩格式开始创建这些文件，然后可以通过wc流式传输该文件的解压缩版本.这将大大减少用于处理此文件的I/O和内存量. gzip可以读写压缩流.

31 gigs is a really big text file. I bet it would compress down to about 1.5 gigs. I would create these files in a compressed format to begin with then you can stream a decompressed version of the file through wc. This will greatly reduce the amount of i/o and memory used to process this file. gzip can read and write compressed streams.

但我还要发表以下评论:

But I would also make the following comments:

• 行号并不是真正有用的XML，因为忽略了元素之间的空格(混合内容除外).您真正想了解什么数据集?我敢打赌，元素计数会更有用.
• 确保您的xml文件没有不必要的冗余，例如，您是否在整个文档中重复相同的名称空间声明?
• 如果尝试查找快速信息集

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