Duan Ligong wrote: > Hi, there. > > I have encountered an issue that there are too many > clog file under the .../pg_clog/ directory. Some of them > were even produced one month ago. If you're going to repost a question, it is only polite that you link to the answers already provided. Particularly so when some of your questions were already answered. -- Alvaro Herrera http://www.CommandPrompt.com/ PostgreSQL Replication, Consulting, Custom Development, 24x7 support