Why should i set global_name=*'TRUE'*

Question

if I create public database link its should be TRUE, What's the logic here ?
SQL>show parameter global_name;
NAME TYPE VALUE
global_names boolean FALSE
SQL>create public database link mydba connect to scott identified by tiger using 'ORCL';
Database link created.
SQL> select * from emp@mydba
select count(*) from emp@mydba;
COUNT(*)
14
Even i set global_name='FALSE' i can create public database link. then
why should i set global_name=*'TRUE'*

Answer 1

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if I create public database link its should be TRUE, What's the logic here ?
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Says who? That isn't true at all. You don't have to see it to TRUE
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Even i set global_name='FALSE' i can create public database link. then
why should i set global_name=*'TRUE'*
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You do NOT have to set it to true but you can if you want your links to have the same name as the DB they connect to.
http://docs.oracle.com/cd/B28359_01/server.111/b28320/initparams088.htm
See the Database Reference
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GLOBAL_NAMES specifies whether a database link is required to have the same name as the database to which it connects.
If the value of GLOBAL_NAMES is false, then no check is performed. If you use or plan to use distributed processing, then Oracle recommends that you set this parameter to true to ensure the use of consistent naming conventions for databases and links in a networked environment.
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The CREATE DATABASE LINK section of the SQL Language Doc tells you what that setting means.
http://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_5005.htm
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If the value of the GLOBAL_NAMES initialization parameter is TRUE, then the database link must have the same name as the database to which it connects. If the value of GLOBAL_NAMES is FALSE, and if you have changed the global name of the database, then you can specify the global name.
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If global_name is TRUE then, as the doc says, 'the database link must have the same name as the database to which it connection.