Bitmap indexing has emerged as a vital tool in the efficient management and interrogation of scientific data. By representing data elements as bits, these indexes facilitate rapid, ...

BitMap（位图）是一种非常高效的数据结构，特别适合处理大规模数据的去重和查询问题。它的基本思想是使用一个bit位来表示一个数字是否存在。 但是呢,是有个1G的内存限制的! 如果放到HashSet,那40亿的QQ数据,都是在内存中的话,我们来算一下,40亿的QQ,要多大的 ...

US stocks slipped Tuesday, while oil prices climbed ahead of Tuesday's release of the August inflation report. Brent crude, the international benchmark, surged above $91 a barrel. WTI jumped toward ...

A Bitmap library (think BitArray, BitVector32, or Bit Index, not bmp) written in C# with more functionality than the .NET default.

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Austin, Texas-based startup Pilosa has announced the launch of the community edition of its "distributed bitmap index" aimed at dramatically improving querying speeds on datasets greater than 1TB ...

Abstract: Historically, bitmap indexing has provided an important database capability to accelerate queries. However, only a few database systems have implemented these indexes because of the ...