Error Message:
Msg 3745, Level 16, State 1, Line 1
Only a clustered index can be dropped online.
Severity level:
16.
Description:
This error message appears when you try to drop a nonclustered index online.
Consequences:
The T-SQL statement can be parsed, but causes the error at runtime.
Resolution:
Errors of the Severity Level 16 are generated by the user and can be fixed by the SQL Server user. The statement cannot be executed this way. You cannot drop a nonclustered index online.
Versions:
This error message was introduced with SQL Server 2005.
Example(s):
USE tempdb;
GO
IF OBJECT_ID(‘tempdb..#t’) > 0
DROP TABLE #t
GO
CREATE TABLE #t
(
id INT,
c1 XML,
)
GO
CREATE UNIQUE NONCLUSTERED INDEX IX_t_id ON #t(id)
GO
DROP INDEX IX_t_id
ON #t
WITH (ONLINE = ON);
GO
Remarks:
In the above example we try to drop the nonclustered index IX_t online. This raises the error.