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about "Oracle recommends that unique indexes be created explicitly"

qihua wu

2006-06-30


The book of "oracle concept" says
 
Oracle recommends that unique indexes be created explicitly, using CREATE UNIQUE INDEX. Creating unique indexes through a primary key or unique constraint is not guaranteed to create a new index, and the index they create is not guaranteed to be a unique index.
 
So under what condition will the created index through primary key or unique constraint not be a unique index?
 

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