B statistics collection is not done for the customers

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B. Statistics collection is not done for the CUSTOMERS table when database stats are gathered. C. Any existing statistics for the CUSTOMERS table are still available to the optimizer at parse time. D. Statistics gathered on the CUSTOMERS table when schema stats are gathered are stored as pending statistics. E. Statistics gathered on the CUSTOMERS table when database stats are gathered are stored as pending statistics. Correct Answer: CDE Section: (none) Explanation Explanation/Reference: Explanation: * SET_TABLE_PREFS Procedure This procedure is used to set the statistics preferences of the specified table in the specified schema. * Example: Using Pending Statistics Assume many modifications have been made to the employees table since the last time statistics were gathered. To ensure that the cost-based optimizer is still picking the best plan, statistics should be gathered once again; however, the user is concerned that new statistics will cause the optimizer to choose bad plans when the current ones are acceptable. The user can do the following: EXEC DBMS_STATS.SET_TABLE_PREFS('hr', 'employees', 'PUBLISH', 'false'); By setting the employees tables publish preference to FALSE, any statistics gather from now on will not be automatically published. The newly gathered statistics will be marked as pending.
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QUESTION 30 Examine the following impdp command to import a database over the network from a pre-12c Oracle database (source): Which three are prerequisites for successful execution of the command? (Choose three.) A. The import operation must be performed by a user on the target database by a user with the DATAPUMP_IMP_FULL_DATABASE role, and the database link must connect to a user with the DATAPUMP_EXP_FULL_DATABASE role on the source database. B. All the user-defined tablespaces must be in read-only mode on the source database. C. The export dump file must be created before starting the import on the target database. D. The source and target database must be running on the same operating system (OS) with the same endianness. E. The impdp operation must be performed by the same user that performed the expdp operation. Correct Answer: ABD Section: (none) Explanation Explanation/Reference: Explanation: In this case we have run the impdp without performing any conversion if endian format is different then we have to first perform conversion. QUESTION 31 Which two are true concerning a multitenant container database with three pluggable database? (Choose two.) A. All administration tasks must be done to a specific pluggable database. B. The pluggable databases increase patching time. C. The pluggable databases reduce administration effort. D. The pluggable databases are patched together. E. Pluggable databases are only used for database consolidation.
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  • Fall '19
  • Oracle Database

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