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What does it mean when a PostgreSQL process is ‘idle in transaction’?
On a server that I’m looking at, the output of ‘ps ax | grep postgres’ I see 9 PostgreSQL processes that look like the following:
postgres: user db 127.0.0.1(55658) idle in transaction Does this mean that some of the processes are hung, waiting for a transaction to be committed? Any pointers to relevant documentation are appreciated.
The PostgreSQL manual indicates that this means the transaction is open (inside BEGIN) and idle. It’s most likely a user connected using the monitor who is thinking or typing. I have plenty of those on my system, too.
If you’re using Slony for replication, however, the Slony-I FAQ suggests
idle in transactionmay mean that the network connection was terminated abruptly. Check out the discussion in that FAQ for more details.