前段时间做了一下zfs做pg的增量恢复测试，mark一下。
服务器信息：
主机：192.168.173.43
备机：192.168.173.41
主备使用流复制搭建，在备机上面进行了zfs快照备份。
做zfs快照备份：
备机：
1、在2016-04-02 15:43:34对存放pg数据的zfs dataset zp1/data01进行快照备份。
数据总大小135MB，使用zfs快照备份后的大小为90.5KB
测试主机误删数据：
主机：
1、主机在build_test表中2016-04-02 15:58:14.28603 时，插入一条记录。
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在2016-04-02 16:01:09.169471+08时，将build_test表清空。
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在备机使用zfs快照+pitr恢复：
备机：
1、 查看之前做的zfs快照备份：
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我们需要恢复到表删除之前，这里需要使用zp1/data01@2016-04-0215:43:34来做恢复，最新的快照备份中build_test数据已经删除。
2、 由于zfs快照恢复是使用最近的快照恢复，之间做的快照都要destroy掉，这里我们使用clone来做恢复。
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3、 在使用clone恢复时，需要修改archive_command，以免覆盖原有的wal。可以将archive_command注释，修改port和删掉postmaster.pid文件。
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4、 修改recovery.conf文件，确定需要恢复的时间点。我们这里是恢复到时间点之前：2016-04-02 16:01:09.169471+08，这里填写的恢复到的时间点是2016-04-02 16:00:09。
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5、 启动数据库服务
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6、 登录入数据库查看数据是否已恢复:
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查看build_test表，看到该表数据已恢复。
注：由于pg没有oracle的rman的增量备份方式，完全可以通过zfs做快照的方式来实现。而且zfs做快照每次做的快照也是增量的，而且可以开启压缩，所以空间非常小.