Creation of a PK via Create Unique Index key more OR through PK restrict only

What is "significance" of the following difference: -.

Some PK indexes in the database that I deal with are scripted by creating a Unique index first, then adding the PK constraint with syntax "using the index.

Others simply create the PK using the addition of the primary key constraint syntax.

We're much better than the other or where in the documentation would review it? I can't find that he discusses more probably looking in the wrong book.

Thanks in advance. Bill

Hi Bill,

If you create a unique index first then add PK constraint or create a PK constraint directly, one and the same.

Say, there is a unique index on the column 'a' and now you want to apply PK constraint on the same column, instead of dropping the index and re-create the same, you can use the existing one. It's ok if the amount of data is less, but for a huge amount of data, it is a killer.

Here's a little comparison of the two cases:

SQL> drop table t purge;

Table dropped.

SQL> create table t ( a number);

Table created.

SQL> create unique index t_idx on t(a);

Index created.

SQL> alter table t add constraint t_pk primary key (a) using index t_idx;

Table altered.

SQL> select uniqueness from user_indexes where index_name = 'T_IDX';

UNIQUENES
---------
UNIQUE

SQL> select constraint_name, constraint_type, index_name from user_constraints where table_name = 'T';

CONSTRAINT_NAME                C INDEX_NAME
------------------------------ - ------------------------------
T_PK                           P T_IDX

SQL>
SQL>
SQL>
SQL>
SQL>
SQL>
SQL>
SQL>
SQL>
SQL>
SQL> drop table t purge;

Table dropped.

SQL> create table t ( a number);

Table created.

SQL> alter table t add constraint t_pk primary key (a);

Table altered.

SQL> select uniqueness from user_indexes where index_name = 'T_PK';

UNIQUENES
---------
UNIQUE

SQL> select constraint_name, constraint_type, index_name from user_constraints where table_name = 'T';

CONSTRAINT_NAME                C INDEX_NAME
------------------------------ - ------------------------------
T_PK                           P T_PK

SQL>

I hope that the answer was clear.

Concerning

Asif Momen
http://momendba.blogspot.com

Tags: Database

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  • creating a unique index of instaed of using the primary key index

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