Relational Index Options in VS .NET

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Relational Index Options
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Option PAD_INDEX
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Description Specifies index padding. When set to ON, this option applies the percentage of free space specified by the FILLFACTOR option to the intermediate-level pages of the index. When set to OFF (the default) or when FILLFACTOR isn t specified, the intermediate-level pages are filled to near capacity, leaving enough space for at least one row of the maximum size the index can have. Specifies a percentage (0 100) that indicates how full the database engine should make the leaf level of each index page during index creation or rebuild. Specifies whether to store temporary sort results in the tempdb database. The default is OFF, meaning intermediate sort results are stored in the same database as the index. Specifies the error response to duplicate key values in a multiple-row insert operation on a unique clustered or unique nonclustered index. The default is OFF, which means an error message is issued and the entire INSERT transaction is rolled back. When this option is set to ON, a warning message is issued, and only the rows violating the unique index fail.
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Lesson 2: Creating Clustered Indexes
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Table 4-1
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Description Specifies whether distribution statistics are recomputed. When set to OFF, the default, automatic statistics updating is enabled. When set to ON, out-ofdate statistics are not automatically recomputed. When set to ON, specifies that the named, preexisting clustered or nonclustered index is dropped and rebuilt. The default is OFF. When set to ON, specifies that underlying tables and associated indexes are available for queries and data modification during the index operation. The default is OFF. When set to ON, the default, specifies that row locks are allowed. When set to ON, the default, specifies that page locks are allowed. Overrides the max degree of parallelism configuration option for the duration of the index operation. MAXDOP limits the number of processors used in a parallel plan execution. The maximum is 64 processors. (Parallel index operations are available only in SQL Server 2005 Enterprise Edition.)
DROP_EXISTING
ONLINE
ALLOW_ROW_LOCKS ALLOW_PAGE_LOCKS MAXDOP
Of these options, let s look a little more closely at the ONLINE option, which is new in SQL Server 2005. As the table description notes, this option enables you to specify whether SQL Server creates indexes online or offline. The default is ONLINE OFF. When a clustered index is built offline, SQL Server locks the table, and users cannot select or modify data. If a nonclustered index is built offline, SQL Server acquires a shared table lock, which allows SELECT statements but no data modification. When you specify ONLINE ON, during index creation, SELECT queries and data-modification statements can access the underlying table or view. When SQL Server creates an index online, it uses row-versioning functionality to ensure that it can build the
4
Creating Indexes
index without conflicting with other operations on the table. Online index creation is available only in SQL Server 2005 Enterprise Edition.
MORE INFO
Index options
For more information about the options available to create an index, see the SQL Server 2005 Books Online topic CREATE INDEX (Transact-SQL). SQL Server 2005 Books Online is installed as part of SQL Server 2005. Updates for SQL Server 2005 Books Online are available for download at www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx.
Disabling an Index
You can disable an index by using the ALTER INDEX Transact-SQL statement, as follows:
ALTER INDEX { index_name | ALL } ON <object> DISABLE [ ; ]
When you disable an index, the index definition remains in the system catalog, but SQL Server no longer uses it. SQL Server does not maintain the index as data in the table changes, and the index cannot be used to satisfy queries. And if you disable a clustered index, the entire table becomes inaccessible. To enable an index, you must drop it and then re-create it to regenerate and populate the B-tree structure. You can do this by using the following ALTER INDEX command, which uses the REBUILD clause:
ALTER INDEX { index_name | ALL } ON <object> REBUILD [ ; ]
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