注意目前该引擎 (v 2.5) 仅支持INT类型列进行 Bitmap Indexing,如果其他类型列 (e.g.String) 需要进行该操作则需要先用 HASH 转换成INT类型数据。 CREATETABLE`pv_bitmap`(`dt`int(11)NULLCOMMENT"",`page`varchar(10)NULLCOMMENT"",`user_id`bitmapBITMAP_UNIONNULLCOMMENT"")ENGINE=OLAPAGGREGATEKEY(`dt...
bitmap indices. ICDE’14, IEEE, 2014; 484–495.•Culpepper JS, Moffat A. Efficient set intersection for inverted indexing. ACM Transactions on Information Systems Dec 2010; 29(1):1:1–1:25, doi:10.1145/1877766.1877767.•Kaser O, Lemire D. Attribute value reordering for efficient hybri...
Sophisticated analytical tools, techniques and increase in processing power have resulted in development of new areas of database management as data warehousing and data mining. On line analytical processing (OLAP), data warehousing and data mining provide this functionality. This research paper focuses...
particular, we draw a parallel between bitmap indexing and num- ber representation in different number systems, and define a space of two orthogonal dimensions that captures a wide array of bitmap indexes, both old and new. Within that space, we identify (analyt- ...
Database IndexingBitmap IndexBitmap compressionByte-based Bitmap CodeWord-Aligned HybridBitmap indexes are commonly used in data warehousing applications such as on-line analytic processing (OLAP). Storing the bitmaps in compressed form has been shown to be effective not only for low cardinality ...
Data warehouses are used to store large amounts of data which is oftenused for On-Line Analytical Processing (OLAP). Short response timesare essential for on-line decision support. Common approaches toreach this goal in read-mostly environments are the precomputation ofmaterialized views and the ...
Out of this first three are traditional techniques which are suitable for Online Transaction Processing system (OLTP) whereas Bitmap indexing is suitable for Online Analytical processing (OLAP) system. The performance of Data warehouse is depends upon the time required to execute query on it. ...