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PostgreSQL Query Slow or Particular Job Slow

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1.Find out any network issues or not
2.Check any code/query changed or not.
3.Take Explain plan then check indexe used or not
  Force index scan --> Seq_scan=false,
  rebuild index-->pg_index,pg_stat_all_indexes 
  Find vaccum analyze-->pg_stat_all_tables
  check join condition
  check no.of process id in client connection 
  USING:
       select count(*) from pg_stat_activity
       select backend from pg_stat_database

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