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单选题
You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference. Which method or feature should you use?（）
A
Compare Period ADDM report
B
AWR Compare Period report
C
Active Session History (ASH) report
D
Taking a new snapshot and comparing it with a preserved snapshot
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多选题You execute the following PL/SQL:Which two statements are true?（）AFine-Grained Auditing (FGA) is enabled for the PRICE column in the PRODUCTS table for SELECT statements only when a row with PRICE 10000 is accessed.BFGA is enabled for the PRODUCTS.PRICE column and an audit record is written whenever a row with PRICE 10000 is accessed.CFGA is enabled for all DML operations by JIM on the PRODUCTS.PRICE column.DFGA is enabled for the PRICE column of the PRODUCTS table and the SQL statements is captured in the FGA audit trial.
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多选题Which two statements are true about the use of the procedures listed in the vsysaux_occupants.move_procedure column?（）AThe procedure may be used for some components to relocate component data to the SYSAUX tablespace from its current tablespace.BThe procedure may be used for some components to relocate component data from the SYSAUX tablespace to another tablespace.CAll the components may be moved into SYSAUX tablespace.DAll the components may be moved from the SYSAUX tablespace.
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单选题A new report process containing a complex query is written, with high impact on the database. You wantto collect basic statistics about query, such as the level of parallelism, total database time, and the number of I/O requests. For the database instance STATISTICS_LEVEL, the initialization parameter is set to TYPICAL and theCONTROL_MANAGEMENT_PACK_ACCESS parameter is set to DIAGNOSTIC+TUNING. What should you do to accomplish this task?（）A
Execute the query and view Active Session History (ASH) for information about the query.B
Enable SQL trace for the query.C
Create a database operation, execute the query, and use the DBMS_SQL_MONITOR. REPORT_SQL_MONITOR function to view the report.D
Use the DBMS_APPLICATION_INFO.SET_SESSION_LONGOPS procedure to monitor query execution and view the information from the V$SESSION_LONGOPS view.
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多选题You use the segment advisor to help determine objects for which space may be reclaimed. Which three statements are true about the advisor given by the segment advisor?（）AIt may advise the use of online table redefinition for tables in dictionary managed tablespace.BIt may advise the use of segment shrink for tables in dictionary managed tablespaces it the no chained rows.CIt may advise the use of online table redefinition for tables in locally managed tablespacesDIt will detect and advise about chained rows.EIt may advise the use of segment shrink for free list managed tables.
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多选题You plan to use the In Database Archiving feature of Oracle Database 12c, and store rows that are inactive for over three months, in Hybrid Columnar Compressed (HCC) format. Which three storage options support the use of HCC?（）AASM disk groups with ASM disks consisting of Exadata Grid Disks.BASM disk groups with ASM disks consisting of LUNS on any Storage Area Network arrayCASM disk groups with ASM disks consisting of any zero padded NFS-mounted filesDDatabase files stored in ZFS and accessed using conventional NFS mounts.EDatabase files stored in ZFS and accessed using the Oracle Direct NFS featureFDatabase files stored in any file system and accessed using the Oracle Direct NFS featureGASM disk groups with ASM disks consisting of LUNs on Pillar Axiom Storage arrays
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考题
单选题Examine the parameter for your database instance: You generated the execution plan for the following query in the plan table and noticed that the nested loop join was done. After actual execution of the query, you notice that the hash join was done in the execution plan: Identify the reason why the optimizer chose different execution plans.（）A
The optimizer used a dynamic plan for the query.B
The optimizer chose different plans because automatic dynamic sampling was enabled.C
The optimizer used re-optimization cardinality feedback for the query.D
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考题
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Only the data definition language (DDL) commands that resulted in errors are logged in the alert log file.B
All DDL commands are logged in the alert log file.C
All DDL commands are logged in a different log file that contains DDL statements and their execution dates.D
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多选题You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index. Which two are possible if table updates are performed which affect the invisible index columns?（）AThe index remains invisible.BThe index is not updated by the DML statements on the indexed table.CThe index automatically becomes visible in order to have it updated by DML on the table.DThe index becomes unusable but the table is updated by the DML.EThe index is updated by the DML on the table.
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多选题Examine the following command: CREATE TABLE (prod_id number(4), Prod_name varchar2 (20), Category_id number(30), Quantity_on_hand number (3) INVISIBLE); Which three statements are true about using an invisible column in the PRODUCTS table?（）AThe %ROWTYPE attribute declarations in PL/SQL to access a row will not display the invisible column in the output.BThe DESCRIBE commands in SQL *Plus will not display the invisible column in the output.CReferential integrity constraint cannot be set on the invisible column.DThe invisible column cannot be made visible and can only be marked as unused.EA primary key constraint can be added on the invisible column.
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