Features list of all databases

Did you ever want to know what all features you are actually using in your databases, and what features are unnecessarily installed in your databases?
OEM holds all the this information. You just need the right query.
In this example, I had to hack the SQL instead of using LISTAGG since the database was pre 11.2 version.

create or replace
type clobagg_type as object(
text clob,
static function ODCIAggregateInitialize(
sctx in out clobagg_type
)
return number,
member function ODCIAggregateIterate(
self in out clobagg_type,
value in clob
)
return number,
member function ODCIAggregateTerminate(
self in clobagg_type,
returnvalue out clob,
flags in number
)
return number,
member function ODCIAggregateMerge(
self in out clobagg_type,
ctx2 in clobagg_type
)
return number
);
/
create or replace
type body clobagg_type
is
static function ODCIAggregateInitialize(
sctx in out clobagg_type
)
return number
is
begin
sctx := clobagg_type(null) ;
return ODCIConst.Success ;
end;
member function ODCIAggregateIterate(
self in out clobagg_type,
value in clob
)
return number
is
begin
self.text := self.text || value ;
return ODCIConst.Success;
end;
member function ODCIAggregateTerminate(
self in clobagg_type,
returnvalue out clob,
flags in number
)
return number
is
begin
returnValue := self.text;
return ODCIConst.Success;
end;
member function ODCIAggregateMerge(
self in out clobagg_type ,
ctx2 in clobagg_type
)
return number
is
begin
self.text := self.text || ctx2.text;
return ODCIConst.Success;
end;
end;
/
create or replace
function clobagg(
input clob
)
return clob
deterministic
parallel_enable
aggregate using clobagg_type;
/

I nicked the above package queries from Oracle forum; credits to BluShadow.

Now for the query which pulls all the information from the OMR database.

select
trim(',' from clobagg(name||',')) as feature_name, host , database_name, target_type ,
instance_name , currently_used ,
max(first_usage_date) ,version as VERSION
from mgmt$db_featureusage
GROUP BY host, database_name, target_type,
INSTANCE_NAME, CURRENTLY_USED, VERSION