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全部博文（487）
发布时间：2019-07-29 11:14:52
A)They are automatically updated when ddl statements execute.C)They can be gathered on external tables.E)They can be estimated.赵：......【阅读全文】
发布时间：2019-07-29 10:36:29
A)They can be gathered manuallyC)They contain the execution plan for each executed SQL statement.E)They can be gathered automatically by an automatic maintenance job.赵：C 错，优化器统计信息和执行计划是两个事，统计信息的最终用途是告诉优化器 optimizer 可以对每个 SQL 去选择最好的执行计划.........【阅读全文】
发布时间：2019-07-26 11:07:08
Which two are true about PL/SQL objects? A)They must be in an invalid state to be recompiled. B)They can never be manually recompiled. C)They can be manually recompiled. D)They must be manually recompiled. E)They can be automatically recompiled. Answer.........【阅读全文】
发布时间：2019-07-26 10:15:01
Which is true about invalid PL/SQL objects? A)They are automatically recompiled against the new definition of a referenced object when they are called. B)They must be manually recompiled before they can be used if a DDL is performed on a table that is referenced in the PL/SQL o.........【阅读全文】
发布时间：2019-07-25 14:01:16
Examine these attributes for the profile assigned to USER1 whose password is oracle_4U ? PASSWORD_REUSE_MAX is 5 ? PASSWORD_REUSE_TIME is 10 ? PASSWORD_GRACE_TIME is 15 Which two are true? A)The USER1 password must not have been used for at least 10 days .........【阅读全文】
