DBCC DBREINDEX (Transact-SQL)

Artikkeli
09/03/2024

Applies to: SQL Server Azure SQL Managed Instance

Rebuilds one or more indexes for a table in the specified database.

Important

This feature will be removed in a future version of SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Use ALTER INDEX instead.

Applies to: SQL Server 2008 (10.0.x) and later versions.

Transact-SQL syntax conventions

Syntax

DBCC DBREINDEX
(
    table_name
    [ , index_name [ , fillfactor ] ]
)
    [ WITH NO_INFOMSGS ]

Arguments

table_name

The name of the table containing the specified index or indexes to rebuild. Table names must follow the rules for identifiers.

index_name

The name of the index to rebuild. Index names must comply with the rules for identifiers. If index_name is specified, table_name must be specified. If index_name isn't specified or is ' ', all indexes for the table are rebuilt.

fillfactor

The percentage of space on each index page for storing data when the index is created or rebuilt. fillfactor replaces the fill factor when the index was created, becoming the new default for the index and for any other nonclustered indexes rebuilt, because a clustered index is rebuilt.

When fillfactor is 0, DBCC DBREINDEX uses the fill factor value last specified for the index. This value is stored in the sys.indexes catalog view.

If fillfactor is specified, table_name and index_name must be specified. If fillfactor isn't specified, the default fill factor, 100, is used. For more information, see Specify Fill Factor for an Index.

WITH NO_INFOMSGS

Suppresses all informational messages that have severity levels from 0 through 10.

Remarks

DBCC DBREINDEX rebuilds an index for a table or all indexes defined for a table. By allowing an index to be rebuilt dynamically, indexes enforcing either PRIMARY KEY or UNIQUE constraints can be rebuilt without having to drop and re-create those constraints. This means that an index can be rebuilt without knowing the structure of a table or its constraints. This might occur after a bulk copy of data into the table.

DBCC DBREINDEX can rebuild all the indexes for a table in one statement. This is easier than coding multiple DROP INDEX and CREATE INDEX statements. Because the work is performed by one statement, DBCC DBREINDEX is automatically atomic, whereas individual DROP INDEX and CREATE INDEX statements must be included in a transaction to be atomic. Also, DBCC DBREINDEX offers more optimizations than individual DROP INDEX and CREATE INDEX statements.

Unlike DBCC INDEXDEFRAG, or ALTER INDEX with the REORGANIZE option, DBCC DBREINDEX is an offline operation. If a nonclustered index is being rebuilt, a shared lock is held on the table in question during the operation. This prevents modifications to the table. If the clustered index is being rebuilt, an exclusive table lock is held. This prevents any table access, therefore effectively making the table offline. To perform an index rebuild online, or to control the degree of parallelism during the index rebuild operation, use the ALTER INDEX REBUILD statement with the ONLINE option.

For more information about selecting a method to rebuild or reorganize an index, see Reorganize and Rebuild Indexes.

Restrictions

DBCC DBREINDEX isn't supported for use on the following objects:

System tables
Spatial indexes
memory-optimized columnstore indexes

Result sets

Unless NO_INFOMSGS is specified (the table name must be specified), DBCC DBREINDEX always returns:

DBCC execution completed. If DBCC printed error messages, contact your system administrator.

Permissions

Caller must own the table, or be a member of the sysadmin fixed server role, the db_owner fixed database role, or the db_ddladmin fixed database role.

Examples

A. Rebuild an index

The following example rebuilds the Employee_EmployeeID clustered index with a fill factor of 80 on the Employee table in the AdventureWorks2022 database.

USE AdventureWorks2022;
GO
DBCC DBREINDEX ('HumanResources.Employee', PK_Employee_BusinessEntityID, 80);
GO

B. Rebuild all indexes

The following example rebuilds all indexes on the Employee table in AdventureWorks2022 by using a fill factor value of 70.

USE AdventureWorks2022;
GO
DBCC DBREINDEX ('HumanResources.Employee', ' ', 70);
GO

Jaa