Which two are true about Oracle's Optimizer statistics?
A)They are automatically updated when ddl statements execute.
B)They can be calculated exactly.
C)They can be gathered on external tables.
D)They are automatically updated when dml statements execute.
E)They can be estimated.
Answer: BE
赵:
estimated adj. 估计的;预计的;估算的;
原创声明:本文系作者授权腾讯云开发者社区发表,未经许可,不得转载。
如有侵权,请联系 cloudcommunity@tencent.com 删除。
原创声明:本文系作者授权腾讯云开发者社区发表,未经许可,不得转载。
如有侵权,请联系 cloudcommunity@tencent.com 删除。