ORA-13708: Some snapshots in the range [string, string] were purged before the analysis was complete.
Cause: One or both of the snapshots have been purged from AWR.
Action: Verify that the AWR auto purging is not trying to purge these snapshots and re-run ADDM.
ORA-13708是显示在Oracle抽取快照时候遇到的一种错误，官方解释是ORA-13708：在分析完成之前，某些快照在范围 [string，string] 中已被清除。此错误通常是由于系统管理员用来清理无用快照时无意清除当前的快照引起的，因此正确的处理方法是：
1.确定清除的快照是何时被清除的；
2.根据实际情况，重新运行抽取分析，或者手工处理卸载；
3.如果可能，把快照文件从备份中恢复出来.