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Monitor CPU and MEMORY percentage used by each process in PostgreSQL/PPAS 9.1

PostgreSQL has pg_stat_activity view which can be use to get the session details. This view gives following information: 1. datid: database OID 2. datname: database name 3. procpid: process ID 4. usesysid: user OID 5. usename: user name 6. application_name: application name 7. client_addr: client's address 8. client_hostname: host name (if available) 9. client_port: Clients port number 10. backend_start: time at which the server process started 11. xact_start: time at which current transaction started 12: query_start: time at which current query began execution started 13: waiting: process's waiting status 14. current_query: text of the current query. Above is good for monitoring sessions in postgresql. However, suppose user wants to know about percentage of CPU & Memory used by a particular session/user, then he can get this information by using plperlu function. To Create the pleperlu function, user needs to have plperlu language installed in DB. For creating the p