Creating an Index associated with a constraint

I'm a beginner,

I got confused, can someone explain what follows...



_ Creating an Index associated with a constraint

Oracle database applies a UNIQUE key or a constraint integrity PRIMARY KEY on a table by creating a unique index on the unique key or primary key. This index is created automatically by the database when the constraint is enabled. No action is required by you when you run the CREATE TABLE or ALTER TABLE statement to create the index, but you can optionally specify an ESCALATION using clause to exercise control over his creation. This includes them when a constraint is defined and enabled, and when a constraint defined but disabled is selected.

To enable a constraint UNIQUE or PRIMARY KEY, thus creating an index associated, the owner of the table must have a quota for the tablespace intended to hold the index or the UNLIMITED TABLESPACE system privilege. The index related to a constraint always takes the name of the constraint, unless you optionally specify otherwise.

Yes, you are right. As above Sybrand and docs say that we can use the INDEX USING something like this:

CREATE TABLE is)
A1 INT PRIMARY KEY to the AID of INDEX (create index on a (a1) AI));

Just read this link, it has all the answers.

http://docs.Oracle.com/CD/B28359_01/server.111/b28310/indexes003.htm

Concerning
Girish Sharma

Tags: Database

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