(Non)Unique Index Vs Unique Constraint

From: Jay <jaysingh1_at_optonline.net>
Date: Fri, 16 Jan 2004 19:14:26 -0800
Message-ID: <F001.005DD0B6.20040116191426@fatcity.com>

All,

Please enlighten this Junior DBA.

Which method is more efficient? When should I go for option (1)?

1)NON-UNIQUE index Vs Unique Constraint
drop table index_test;
create table index_test(c1 number,c2 varchar2(20)); create index i1 on index_test(c1);
alter table index_test add constraint index_test_uk1 UNIQUE(c1);

2)UNIQUE index Vs Unique Constraint
drop table index_test;
create table index_test(c1 number,c2 varchar2(20)); create UNIQUE index i1 on index_test(c1); alter table index_test add constraint index_test_uk1 UNIQUE(c1);

Thanks in advance,
Jay
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Author: Jay
INET: jaysingh1_at_optonline.net

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