Variable Length Index Compression 变长索引压缩
Length after compression 压缩后长度
minimum compression length 最小压缩长度
run-length code compression tactic 游程编码压缩策略
Null and default value Compression (V8 GA) : Compression for null, zero length data in variable length columns and system default value.
null值和缺省值压缩(V 8 GA)：对变长列中的零长度空数据和系统缺省值进行压缩。
Row Length: The larger the row is (especially as it approaches the size of a page), the less efficient compression might be.
行的长度： 行的长度越大（尤其是它接近页宽时），压缩的效率就越低。
In DB2 9, any data row that is equal to or less than the database manager minimum record length is not used in the sampling when building the dictionary, and is not compressed during row compression.
在DB 2 9中，在构建字典时，任何小于或等于数据库管理器最小记录长度的数据行都不用于抽样，并且在行压缩期间不会被压缩。
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