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Full-text indexes are special-purpose indexes that support the full-text search feature the ability to search ef ciently through character and binary columns in a table. The speci cs of creating and using full-text indexes are beyond the scope of this book, but SQL Server Books Online has a comprehensive section describing full-text indexing. Full-text indexes are inverted, stacked, and compressed indexes that are stored in the database in internal tables for convenience. The full-text index data is stored in regular index rows in the internal tables, but the majority of the row is opaque to everything except the full-text engine itself (tools like DBCC PAGE cannot properly crack open all elds in the rows). The storage for full-text indexes is the same as for regular indexes, but as they are stored as internal tables, regular methods of nding their structures do not work. For instance, the
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Microsoft SQL Server 2008 Internals
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HumanResources.JobCandidate table in the AdventureWorks2008 database has a full-text index. To nd the object IDs of the internal table(s) in which the full-text index is stored, the following T-SQL can be used to query the sys.internal_tables catalog view:
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USE AdventureWorks2008; GO SELECT [name], [object_id] FROM sys.internal_tables WHERE parent_object_id = OBJECT_ID ('HumanResources.JobCandidate'); GO RESULT: name -----------------------------------------------fulltext_index_docidstatus_1333579789 fulltext_docidfilter_1333579789 fulltext_indexeddocid_1333579789 fulltext_avdl_1333579789
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object_id ----------2046630334 2062630391 2078630448 2094630505
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The regular methods for examining index structures can then be employed, using the object ID returned from sys.internal_tables. The same method works for spatial indexes and XML indexes, described next. As you can see, internal tables have a different root in the system catalogs compared to regular tables and indexes, although their space usage is tracked in exactly the same way (using IAM pages) and their structures are the same as regular indexes. The SQL Server Books Online section Internal Tables contains a detailed explanation of them, including an entity-relationship diagram of the relevant system catalogs and various queries to view information about them.
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A spatial index contains a decomposed view of all values in a spatial data type column in a table. The decomposed values are used for fuzzy-pruning of matching values during spatial comparison operations. As for full-text indexes, the speci cs of creating and using spatial indexes are beyond the scope of this book, but SQL Server Books Online has an excellent section describing them. See the topic Spatial Indexing Overview. A spatial index is a clustered index that is stored as an internal table. Apart from storing the decomposed spatial values, it has exactly the same structure as a regular index.
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An XML index provides an ef cient mechanism for searching XML BLOB values by storing a shredded representation of the XML data that can be searched with regular B-tree methods, instead of having to walk through a (potentially large) XML BLOB. As with full-text and spatial indexes, the speci cs of creating and using XML indexes are beyond the scope of this book, but SQL Server Books Online has an excellent section describing them. See the topic Indexes on XML Data Types.
6
Indexes: Internals and Management
There are two types of XML indexes; primary XML indexes and secondary XML indexes. A primary XML index is a shredded representation of each value in the XML column being indexed, with one row for each node in the XML BLOB. A primary XML index is a clustered index and is stored as an internal table. A secondary XML index is a nonclustered index on the primary XML index and provides the same function as a regular nonclustered index; a different access path to the data using a different sort order. The internal structures of these indexes are the same as those for regular indexes.
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