How to extract data from files in pg_xlog

From: "SunYanXiang" <sunyx(at)fms(dot)com(dot)cn>
To: pgsql-general(at)postgresql(dot)org <pgsql-general(at)postgresql(dot)org>
Subject: How to extract data from files in pg_xlog
Date: 2006-06-02 01:59:41
Message-ID: 1149214203$14427$13745125@sunyx@fms.com.cn
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Dear Mr.:
I want to exchange data in many DB (between one Central DB and many Remote DBs). The DBs are in individual LAN and not in WAN (INet), so they cannot transfer data directly. I can palce a host in INet. The DBs can access INet host and transfer data by the host. Now I want exctract data from WAL files in root/pg_xlog, but I don't understand its structure. How can I get it ? or who teach me please ?
Thank you very much

　　　　　　　　SunYanXiang
　　　　　　　　sunyx(at)fms(dot)com(dot)cn
　　　　　　　　　　2006-06-02

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