Suggest the best values for the postgres configuration parameters

[Raghavendra Rao J S V <raghavendrajsv@xxxxxxxxx>]

We are using postgres 9.2  version on Centos operating system. 

Total ram available is 80GB . At present we don't have any connection pool mechanisiam.  Max number of  connections are allowed is 1000. 

Could you please suggest the best values for the below configuration parameters?

• shared_buffers 
  
• effective_cache_size 
  
• work_mem 
  
• maintenance_work_mem 
  
• checkpoint_segments 
  
• wal_keep_segments 
  
• checkpoint_completion_target 
  
• Max_prepared_transactions =0  

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Regards,
Raghavendra Rao J S V

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