Изменение первичного ключа с некластеризованного на кластеризованное

Ответ 1

1) Сначала отбросьте существующий кластерный индекс (IX_TableX_FieldB):

   DROP INDEX TableX.IX_TableX_FieldB

2) Создайте (временное) ограничение UNIQUE для уникальных полей, на которые ссылается первичный ключ

    ALTER TABLE TableX
    ADD CONSTRAINT UQ_TableX UNIQUE(FieldA)

3) Снимите ПЕРВИЧНЫЙ КЛЮЧ

    ALTER TABLE TableX
    DROP CONSTRAINT PK_TableX

4) Восстановите главный ключ как CLUSTERED

   ALTER TABLE TableX
   ADD CONSTRAINT PK_TableX PRIMARY KEY CLUSTERED(FieldA)

5) Снимите временное ограничение UNIQUE

   ALTER TABLE TableX
   DROP CONSTRAINT UQ_TableX

6) Добавьте IX_TableX_FieldB обратно как NONCLUSTERED

   CREATE NONCLUSTERED INDEX IX_TableX_FieldB ON TableX(FieldB)

Ответ 2

Я знаю, что это старый, но это будет script из всех капель FK, pk drop, pk rereate, FK воссоздается. Замените MYTABLE на имя вашей таблицы.

   IF  EXISTS (SELECT * FROM sys.tables WHERE object_id = OBJECT_ID(N'[dbo].[FKAgainstTableList]'))
BEGIN 
    DROP TABLE FKAgainstTableList
END
--CREATE TABLE FKAgainstTableList (ForeignKey VARCHAR(30),[Table] VARCHAR(30))
DECLARE @PKTableName VARCHAR(100), 
        @PKName varchar(100),
        @FKName varchar(100),
        @sql varchar(max),
        @PKcolumnName varchar(30),
        @table VARCHAR(100),
        @FKColumnName VARCHAR(100), 
        @parentColumnNumber int
SET @PKTableName = 'MYTABLE'
set @PKName = (SELECT name FROM sys.indexes WHERE OBJECT_NAME(object_id) = @PKTableName AND is_primary_key = 1)
set @PKcolumnName = (SELECT name FROM sys.columns WHERE OBJECT_NAME(object_id) = @PKTableName AND is_identity =1)
PRINT @PKcolumnName

 SELECT  OBJECT_NAME(sys.foreign_key_columns.parent_object_id) [Table],sys.columns.name [FKColumnName],sys.foreign_keys.name [FKName] 
    INTO FKAgainstTableList
    FROM sys.foreign_keys INNER JOIN sys.foreign_key_columns 
    ON sys.foreign_keys.object_id = sys.foreign_key_columns.constraint_object_id
    INNER JOIN sys.columns ON sys.columns.object_id = sys.foreign_keys.parent_object_id AND sys.columns.column_id = sys.foreign_key_columns.parent_column_id
    WHERE OBJECT_NAME(sys.foreign_keys.referenced_object_id) = @PKTableName


DECLARE table_cur1 CURSOR  FOR
    SELECT  * FROM FKAgainstTableList

    PRINT @sql

-------------------------------Disable constraint on FK Tables
OPEN table_cur1
FETCH NEXT FROM table_cur1 INTO @table,@FKColumnName,@FKName
WHILE   @@FETCH_STATUS = 0
    BEGIN
        SET @sql ='ALTER TABLE '[email protected]+' DROP CONSTRAINT '+ @FKName
        PRINT @sql
        FETCH NEXT FROM table_cur1 INTO @table,@FKColumnName,@FKName
    END
CLOSE table_cur1
DEALLOCATE table_cur1
--------------------------------DROP AND recreate CLUSTERED pk
IF  EXISTS (SELECT 1 FROM sys.indexes WHERE object_id = OBJECT_ID(@PKTableName) AND name = @PKName)
BEGIN
    SET @sql = 'ALTER TABLE '[email protected]+' DROP CONSTRAINT '+ @PKName
    PRINT @sql

END
SET @sql = 'ALTER TABLE '[email protected] +' ADD  CONSTRAINT '[email protected]+' PRIMARY KEY CLUSTERED ('[email protected]+' ASC)
WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON, FILLFACTOR = 80) ON [PRIMARY]'
PRINT(@sql)

--------------------------------Enable FK constraints on FK tables.
DECLARE table_cur2 CURSOR  FOR
    SELECT  * FROM FKAgainstTableList
OPEN table_cur2
FETCH NEXT FROM table_cur2 INTO @table,@FKColumnName,@FKName
WHILE   @@FETCH_STATUS = 0
    BEGIN
        SET @sql = 'ALTER TABLE '[email protected]+' WITH NOCHECK ADD  CONSTRAINT  '+ @FKName+' FOREIGN KEY(['[email protected]+'])
        REFERENCES ['[email protected]+'] (['[email protected]+'])'
        PRINT(@sql)
        SET @sql = 'ALTER TABLE '[email protected]+' CHECK CONSTRAINT  '[email protected]
        PRINT(@sql)

        FETCH NEXT FROM table_cur2 INTO @table,@FKColumnName,@FKName

         END
CLOSE table_cur2
DEALLOCATE table_cur2
DROP TABLE FKAgainstTableList