The best replacement for clustered index is non clustered index.

The best alternatives to clustered index are rated as following:

★★★★★	non clustered index
★★★	primary key
★★★	non clustered
★★★	heap
★★	non-clustered index
★★	non-clustered
★	unique index
★	secondary index
★	nonclustered index
★	index organized table
★	index
	covering index
	nonclustered
	unclustered index

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Speaking about clustered index, one probably shouldn't forget about primary key.

Other search terms related to clustered index and their ratings are:

★★★★★	primary key
★	non primary key
	clustered index

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clustered index

non clustered index

primary key