Script -Compilation

Question

Yesterday one of my friend this script ,when i asked for compilation after functions ... But i am still confuse with other scripts , so please tell me exactly how this script will help out ,its for compilation or any other reasons.
The main thing is I am creating functions and i need to compile . If i will not do compilation my team getting alerts that you have invalid objects .
set echo off termout off head off verify off feedback off
select 'alter '||object_type||' '||owner||'."'||object_name||'" compile;'
from user_objects
where status<>'VALID'
and object_type not in ('PACKAGE BODY','TYPE BODY','UNDEFINED','SYNONYM')
union
select 'alter package '||owner||'.'||object_name||' compile body;'
from user_objects
where status<>'VALID'
and object_type='PACKAGE BODY'
union
select 'alter type '||owner||'.'||object_name||' compile body;'
from user_objects
where status<>'VALID'
and object_type='TYPE BODY'
union
select 'alter materialized view '||owner||'.'||object_name||' compile;'
from user_objects
where status<>'VALID'
and object_type='UNDEFINED'
union
select 'alter synonym '||owner||'.'||object_name||' compile;'
from user_objects
where status<>'VALID'
and object_type='SYNONYM'
and owner<>'PUBLIC'
union
select 'alter public synonym '||object_name||' compile;'
from user_objects
where status<>'VALID'
and object_type='SYNONYM'
and owner='PUBLIC';
spool off
@compile.sql

Answer 1

The best solution to compile invalid objects is to use the code Oracle provided for this purpose.
It is in %ORACLE_HOME%\rdbms\admin\utlrp.sql and it needs to be ran as SYS.
You can see the very reason to run the Oracle provided code in this script.
First of all: it is not correct, as synonyms are not compiled.
Secondly: Oracle is maintaining utlrp.sql., who is maintaining this script?
Sybrand Bakker
Senior Oracle DBA