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Bitmap Indexes → indexes are very space efficient. Bitmap indexing efficiently merges indexes that correspond to several … Bitmap Indexes and Nulls Bitmap Indexes on Partitioned Tables Benefits for Data Warehousing … data in the table. Bitmap indexes
Bitmap Indexes → Bitmap indexes on index-organized tables are supported, provided the index-organized table is
Overview of Bitmap Indexes in Data Warehousing → Bitmap indexes are widely used in data warehousing environments. The environments typically have … the table. Bitmap indexes are typically only a fraction of the size of the indexed data in the table … , bitmap indexes save space. Bitmap indexes are
Bitmap Indexes on Index-Organized Tables → Oracle Database supports bitmap indexes on partitioned and nonpartitioned index-organized tables. A … mapping table is required for creating bitmap indexes on an index-organized table. Mapping Table … one mapping table for each index-organized table and it is used by all the bitmap indexes
14.5 Using Bitmap Indexes for Performance → Bitmap indexes can substantially improve performance of queries that have all of the following … . The bitmap indexes used in the queries have been created on some or all of these low- or medium … -cardinality columns. The tables in the queries contain many rows. You can use multiple bitmap indexes
12.7 Viewing Bitmap Indexes with EXPLAIN PLAN → Index row sources using bitmap indexes appear in the EXPLAIN PLAN output with the word BITMAP … EXPLAIN PLAN with Bitmap Indexes EXPLAIN PLAN FOR SELECT * FROM t WHERE c1 = 2 AND c2 <> 6 OR c3 BETWEEN … 10 AND 20; SELECT STATEMENT TABLE ACCESS T BY INDEX ROWID BITMAP CONVERSION TO ROWID
Bitmap Indexes and Nulls → Unlike most other types of indexes, bitmap indexes include rows that have NULL values. Indexing of … COUNT. Example 6-2 Bitmap Index SELECT COUNT(*) FROM customers WHERE cust_marital_status IS NULL; This … query uses a bitmap index on cust_marital_status. Note that this query would not be able to use
Bitmap Indexes on Partitioned Tables → You can create bitmap indexes on partitioned tables but they must be local to the partitioned table … —they cannot be global indexes. A partitioned table can only have global B-tree indexes, partitioned
Using Bitmap Indexes in Data Warehouses → Bitmap indexes are widely used in data warehousing environments. The environments typically have … data in the table. Bitmap indexes are typically only a fraction of the size of the indexed data in … bitmap index provides the same functionality as a regular index. Bitmap indexes
About Indexes → Oracle Real Application Clusters applications Bitmap indexes: compact; work best for columns with a … Indexes are optional structures associated with tables and clusters that allow SQL queries to … . You can use indexes without rewriting any queries. Your results are the same, but you see them more … functionality.
Overview of Indexes → Reverse key indexes Bitmap indexes Bitmap join indexes Oracle Database also provides support for function … Scan Index Range Scan Key Compression Reverse Key Indexes Bitmap Indexes Bitmap Join Indexes … Indexes
Function-Based Indexes → Function-Based Indexes See Also: \"Bitmap Indexes\" Oracle Database Performance Tuning Guide for more … You can create indexes on functions and expressions that involve one or more columns in the table … in the index. You can create a function-based index as either a B-tree or a bitmap index. The
Indexes and Nulls → indexes or when the cluster key column value is NULL. See Also: \"Bitmap Indexes and Nulls\" … NULL values in indexes are considered to be distinct except when all the non- NULL values in two or … . Therefore, UNIQUE indexes prevent rows containing NULL values from being treated as identical. This does
Guidelines for Managing Indexes → Data Warehousing Guide for information about bitmap indexes Oracle Database Data Cartridge Developer's … This section discusses guidelines for managing indexes and contains the following topics: Create … Indexes After Inserting Table Data Index the Correct Tables and Columns Order Index Columns for … Performance
Creating Secondary Indexes on Index-Organized Tables → secondary indexes, and bitmap indexes are supported as secondary indexes on index-organized tables. … You can create secondary indexes on an index-organized tables to provide multiple access paths … . Secondary indexes on index-organized tables differ from indexes on
Indexes and Partitioned Indexes → -tree indexes, bitmap indexes are very common in data warehousing environments. Bitmap indexes are … Indexes are optional structures associated with tables or clusters. In addition to the classical B … optimized data access methods such as star transformations. Indexes
Bitmap Join Indexes → table. Bitmap join indexes are much more efficient in storage than materialized join views, an … compress the rowids of the fact tables. See Also: Oracle Database Data Warehousing Guide for more information on bitmap join indexes … In addition to a bitmap index on a single table, you can create a bitmap
Miscellaneous Information about Creating Indexes on Partitioned Tables → You can create bitmap indexes on partitioned tables, with the restriction that the bitmap indexes … must be local to the partitioned table. They cannot be global indexes. Global indexes can be unique … . Local indexes can only be unique if the partitioning key is a part
6 Indexes → This chapter contains the following topics: Using Bitmap Indexes in Data Warehouses Using B-Tree … Indexes in Data Warehouses Using Index Compression Choosing Between Local Indexes and Global Indexes
14 Using Indexes and Clusters → Index-Organized Tables for Performance Using Bitmap Indexes for Performance Using Bitmap Join Indexes … This chapter provides an overview of data access methods using indexes and clusters that can … Performance Using Function-based Indexes for Performance Using Partitioned Indexes