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参考链接：
www.javaworld.com.tw/roller/ingramchen/entry/2007_5_25_SimplePostgreSQLBackup
PostgreSQL本身还有动态在线热备份的功能，就是说我们在没有做离线备份的情况下也可以将数据恢复到一个历史时间点。请参见： www.postgresql.org/docs/8.1/static/backup-online.html
