The following bug has been logged online:

Bug reference: 2666
Logged by: how to cluster
Email address: pang.jinsong@gd-linux.com
PostgreSQL version: 7.4.13
Operating system: i586
Description: how do cluster with 7.4.13 ?
Details:

how do cluster with 7.4.13 ?

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TIP 6: explain analyze is your friend