Occasionally a database closes abnormally with one or more distributed transactions
in doubt (neither committed nor rolled back). When you reopen the database and
recovery is complete, the RECO background process automatically, immediately, and
consistently resolves any in-doubt distributed transactions.

解决拿不准的分布式事务
1. 拿不准的分布式事务 : 数据库异常关闭时 , 一个或多个分布式事务既没有提交也没有回滚
2. 重新打开数据库并完成恢复工作后 , RECO 后台进程将自动地处理拿不准的分布式事务