bitmap index造句
例句與造句
- Variations on the bitmap index can effectively index this data as well.
- The Oracle implementation limits itself to using bitmap indexes.
- This is the simplest form of bitmap index.
- For example, using bitmap indexes, sorting can improve compression by an order of magnitude.
- Bitmap indexes have a significant space and performance advantage over other structures for query of such data.
- It's difficult to find bitmap index in a sentence. 用bitmap index造句挺難的
- Each column in the left illustration is a " bitmap " in the bitmap index.
- For such variables, the bitmap index can have a significant performance advantage over the commonly used trees.
- Some database systems that do not offer persistent bitmap indexes use bitmaps internally to speed up query processing.
- In contrast, the bitmap index is designed for cases where the values of a variable repeat very frequently.
- Bitmap indexes use bit arrays ( commonly called bitmaps ) and answer queries by performing bitwise logical operations on these bitmaps.
- For example, PostgreSQL versions 8.1 and later implement a " bitmap index scan " optimization to speed up arbitrarily complex logical operations between available indexes on a single table.
- Efficient graph management based on bitmap indices article shows how bitmap index representation can be used to manage large dataset ( billions of data points ) and answer queries related to graph efficiently.
- A bitmap index is a special kind of indexing that stores the bulk of its data as bit arrays ( bitmaps ) and answers most queries by performing bitwise logical operations on these bitmaps.
- However, most compressed data formats are not so easy to access randomly; also by compressing bit arrays too aggressively we run the risk of losing the benefits due to bit-level parallelism ( Bitmap index ( compression ) ).
- Bitmap indexes have traditionally been considered to work well for " low-cardinality columns ", which have a modest number of distinct values, either absolutely, or relative to the number of records that contain the data.
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