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According to a comment on this question I asked about idle connections in PostgreSQL 9.2, some uncommitted transactions (possibly related to some of those idle connections) might cause some performance issues.

What is a good way to determine if there are uncommitted transactions (bonus points if there is a way to know if the connection they're on is idle or not)?

Thanks very much!

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Have a look at pgtop. You may also hunt for rows showing "idle in transaction" in the output of ps aux. –  dezso Apr 11 '13 at 5:20
    
@dezso - pgtop looks interesting; is there an equivalent for Windows? –  Max Vernon Apr 11 '13 at 14:25
    
@MaxVernon there are some hints that it is supposed to work on Windows but haven't seen any concrete example. But it is still a (relatively) simple Perl project, so... And anyway, it works on the pg_stat* views. –  dezso Apr 11 '13 at 15:20
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1 Answer

up vote 2 down vote accepted

If you want to see how many idle connections you have that have an open transaction, you could use:

select * 
from pg_stat_activity
where state = 'idle'
    and xact_start is not null;

This will provide a list of open connections that are in the idle state, that also have an open transaction.

Having said that, I cannot recreate an open connection in the idle state that has an open transaction. Perhaps someone else can provide details on how to do that.

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Thanks very much! –  Juan Carlos Coto Apr 11 '13 at 15:29
2  
Beware that the state column is present only in 9.2. And for me it looks like the proper state is 'idle in transaction'. –  dezso Apr 11 '13 at 16:29
1  
I agree with dezso. –  francs Apr 12 '13 at 2:01
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