Check what oracle installed components are actually being used in database

I have been allotted a new database which I have to optimize. So I am thinking about removing some installed components which I think are not being used in any way in database (i.e procedures calls etc). I can see a whole lot of components like "SDO","ORDIM" which I think are not being used but previous DBAs have installed them. So, is there any way to ensure that no part of database are actually using these components so that I can remove these components. Also ,what are your expert comments about this?

Is this a production or a development environment? If an object isn't being used then it's not necessarily a problem (performance wise) unless it's cluttering up either your dictionary or raising concerns in regards consuming unnecessary space. Personally I'd recommend that it's better to tune what is being used / taking resources. It may be a once a year report or some old utility pulled out once a year, best check why these things are there.
If you go down the dropping route, rather than drop anything immediately lock accounts for an agreed period of time to make sure that the schema isn't used & check any references from other schemas to objects within the schema that you're planning to drop, potentially audit these to check whether they're being called by other schemas / checking dba_dependencies between schemas & objects using a hierarchical query to check sublevels. 
There are also quite a few Oracle standard components that are installed by default that have interdependencies and won't necessarily be used in the dictionary (checking dba_features_usage_statistics)

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