Hi Andrew,

at that specific time, there are no other long running transactions.
Just a few users on the tomcat producing minor database traffic.
The vacuum run is 2 hours later. 

The problem begins when running a script which sends select statements over a raw jdbc connection in autocommit mode.

If the script runs against a slony slave, everything is fine. But against the master database, the replication as well as other queries get very slow.

Best regards
Burak 
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