[GENERAL] Idle in transcation problem?

i use the "ps -ef | grep postgres" to see all the connections. the
connection's status is "Idle in transcation".

and i use the " du -h /mydb" to check the disk size. The disk size of
mydb has increased from 400MB to 600MB.
Why? because of the "idle in transcation" ?

my pg version:8.1.3
OS: Linux Enterprise 4

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