Heavy postgres process

Hi Admin,

I'm new to this I have few queries as listed below

1) Number of connections made with a particular database.

2) And how can I check which process (PID) is responsible for the connection and

3) what all can make a postgres process as heavy as 70-80 MB in size

Need to know these answers ASAP so I would highly appreciate if you can find time to answer my questions.

Regards,
~Vivek

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