Such situations make channel-level compression very valuable.
这种情况使得通道级压缩变得非常重要。
At small block sizes, compression is much worse than file-level compression.
块大小比较小时，压缩比文件级别压缩差很多。
As one would expect, once block size gets large, it makes no difference whether block-level compression is used.
正如预期的那样，一旦块大小变大，是否使用块级别压缩并没有区别。
This feature complemented the existing column level compression, system default value compression, and value compression options.
该特性弥补了已有的列级压缩、系统默认值压缩和值压缩选项。
In general, you must have blocks of 100k or larger before the block-level compression pulls nearly even with the file-level compression.
通常，要使块级别压缩的效果与文件级别压缩几乎相同，块的大小必须要有100k或更大。
You can add next level compression to it by using GZIP / LZW or any other compression algorithm.
您可以使用GZIP /LZW或任何其他压缩算法为其添加下一级压缩。
On the graphs below, the two gray bars in the front represent the compression achievable with simple file-level compression, using gzip and bzip2.
在下面的图中，前面的两个灰色条表示简单的文件级别压缩(使用gzip和bzip2)所取得的压缩效果。
Around 10k block size, block-level compression starts to look moderately good; and at 100k block size it becomes very close to the file-level compression techniques.
块大小约为10k时，块级别压缩开始显得比较不错；块大小为100k时，块级别压缩就非常接近文件级别压缩技术了。
As discussed above, file-level compression of large files might be impractical; but as expected, file-level compression achieves better results since it looks for repeated strings in the whole file.
正如上面所讨论的，对大文件进行文件级别的压缩可能不太实际；但正如预期的那样，文件级别的压缩会取得更好的结果，因为它是在整个文件中寻找重复的字符串。
As discussed above, file-level compression of large files might be impractical; but as expected, file-level compression achieves better results since it looks for repeated strings in the whole file.
正如上面所讨论的，对大文件进行文件级别的压缩可能不太实际；但正如预期的那样，文件级别的压缩会取得更好的结果，因为它是在整个文件中寻找重复的字符串。
应用推荐