What is domain index in Oracle 11g?
A domain index is an index designed for a specialized domain, such as spatial or image processing. Users can build a domain index of a given type after the designer creates the indextype.
What is a domain index?
The domain index is used for indexing non-traditional data, such as LOB data, video data and other non-textual columns. A DOMAIN index is stored in an index organized table (IOT) or in an external file. DOMAIN indexes are built against an index type.
What is an Oracle Indextype?
Purpose. Use the CREATE INDEXTYPE statement to create an indextype, which is an object that specifies the routines that manage a domain (application-specific) index. Indextypes reside in the same namespace as tables, views, and other schema objects.
What are the different types of indexes available in Oracle?
- Index Characteristics.
- B-Tree Indexes.
- Bitmap Indexes.
- Function-Based Indexes.
- Application Domain Indexes.
- Index Storage.
What is context index Oracle?
The CONTEXT index type is used to index large amounts of text such as Word, PDF, XML, HTML or plain text documents. In this example we will store the data in a BLOB column, which allows us to store binary documents like Word and PDF as well as plain text.
What is an Oracle domain?
What Is a Domain? An Oracle WebLogic Server administration domain is a logically related group of Oracle WebLogic Server resources. Domains include a special Oracle WebLogic Server instance called the Administration Server, which is the central point from which you configure and manage all resources in the domain.
Why do we use index in Oracle?
Indexes are used in Oracle to provide quick access to rows in a table. Indexes provide faster access to data for operations that return a small portion of a table’s rows.
What is difference between B-tree and bitmap index?
The basic differences between b-tree and bitmap indexes include: 2: Cardinality differences: The bitmap index is generally for columns with lots of duplicate values (low cardinality), while b-tree indexes are best for high cardinality columns.
How are indexes stored in Oracle?
All data in Oracle – tables, indexes, clusters – is stored in blocks. The block size is configurable for any given database but is usually one of 4Kb, 8Kb, 16Kb, or 32Kb. Rows in a table are usually much smaller than this, so many rows will generally fit into a single block.
What is a Bfile in Oracle?
BFILE is an Oracle proprietary data type that provides read-only access to data located outside the database tablespaces on tertiary storage devices, such as hard disks, network mounted files systems, CD-ROMs, PhotoCDs, and DVDs. BFILE data is not under transaction control and is not stored by database backups.
What is the system-managed approach to domain indexes in Oracle 11g?
The system-managed approach to domain indexes in the Oracle Database 11g Release 1, requires less programmatic overhead and delivers better performance than the earlier user-managed domain indexes. It addresses the limitations of the user-managed approach, and has the following benefits:
Where are domain indexes stored in Oracle?
A domain index can be stored in an index-organized table or outside of the Oracle database. In the next lesson, you will learn how Oracle allows you to perform some index maintenance operations online. A domain index is an index designed for a specialized domain, such as spatial or image processing.
What is the index structure in Oracle Database?
The index structure itself can be stored in the Oracle database as an index-organized table or externally as a file. Domain indexes are built using the indexing logic supplied by a user-defined indextype. An indextype provides an efficient mechanism to access data that satisfy certain operator predicates.
What is a domaindomain index?
Domain indexes are indexes whose behavior is specific to an industry, a business function, or some other special purpose. As the cartridge developer, you specify the details of this behavior, as described in this chapter. This chapter contains these topics: