"Charles.Hou" <ivan.hou@xxxxxxxxxxxxx> writes: > 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" ? Maybe. Old open transactions would prevent VACUUM from removing deleted row versions (because they might still be visible to those transactions). So if this condition persisted for a long time it could be responsible for table bloat. It's a good idea to make sure your client code doesn't leave transactions sitting open for long periods. > my pg version:8.1.3 You really ought to get onto a more recent sub-release ... that one is 2.5 years old and has many known bugs. http://www.postgresql.org/docs/8.1/static/release.html regards, tom lane
