> LOG:  checkpoints are occurring too frequently (19 seconds apart)
> HINT:  Consider increasing the configuration parameter 
> "checkpoint_segments".
> LOG:  checkpoints are occurring too frequently (12 seconds apart)
> HINT:  Consider increasing the configuration parameter 
> "checkpoint_segments".
> LOG:  checkpoints are occurring too frequently (12 seconds apart)
> HINT:  Consider increasing the configuration parameter 
> "checkpoint_segments".
> LOG:  checkpoints are occurring too frequently (11 seconds apart)
> HINT:  Consider increasing the configuration parameter 
> "checkpoint_segments".
> LOG:  checkpoints are occurring too frequently (12 seconds apart)
> HINT:  Consider increasing the configuration parameter 
> "checkpoint_segments".
>
> What does this mean and what causes it ??? 

This generally happens as a result of having LOTS of updates going
into the database.

If you're doing bulk loads of data, this is absolutely normal.

It probably is a good idea to increase the specified config parameter;
that can improve performance for most of the cases where the message
comes up.
-- 
let name="cbbrowne" and tld="acm.org" in String.concat "@" [name;tld];;
http://cbbrowne.com/info/rdbms.html
Rules of  the Evil  Overlord #153.  "My Legions of  Terror will  be an
equal-opportunity employer. Conversely, when  it is prophesied that no
man  can defeat  me, I  will  keep in  mind the  increasing number  of
non-traditional gender roles." <http://www.eviloverlord.com/>

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not
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