88. A user receives the following error while executing a query:

ORA-01555: snapshot too old

Which two options can be the solutions to avoid such errors in future? (Choose two.) A) increase the size of redo log files

B) increase the size of the undo tablespace

C) increase the size of the Database Buffer Cache

D) increase the size of the default temporary tablespace

E) enable the retention guarantee for the undo tablespace

答案：BE

ORA-01555: snapshot too old 解决这个问题，一、增加undo表空间大小，二、打开retention guarantee

Oracle ORA-01555快照过旧

http://blog.csdn.net/tianlesoftware/archive/2009/10/31/4745898.aspx

ITPub博客

042-088