單項選擇題

The UNDO_RETENTION parameter in your database is set to 1000 and undo retention is not guaranteed. Which statement regarding retention of undo data is correct？（）

A.Undo data becomes obsolete after 1，000 seconds.
B.Undo data gets refreshed after every 1，000 seconds.
C.Undo data will be stored permanently after 1，000 seconds.
D.Committed undo data would be retained for 1，000 seconds if free undo space is available.
E.Undo data will be retained in the UNDO tablespace for 1，000 seconds，then it gets moved to the TEMPORARY tablespace to provide read consistency.

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單項選擇題

You received complaints about the degradation of SQL query performance. You identified top SQL queries that consume time. What would be your next step to find out recommendations about statistics collection and restructuring of the SQL statement to improve query performance？（）

A.run Segment Advisor
B.run SQL Tuning Advisor on top SQL statements
C.run the Automatic Workload Repository （AWR） report
D.run the Automatic Database Diagnostic Monitor （ADDM）on top SQL statements

多項選擇題

Which three statements are true about the stages of database startup？（）

A.Data files and redo log files can be renamed at the MOUNT stage.
B.Control files are read at the OPEN stage for the location of data files.
C.Control files are required to bring the database to the NOMOUNT stage.
D.Data files and redo log files are made available to users at the OPEN stage.
E.Data files and online redo log files are checked for consistency while opening the database

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The UNDO_RETENTION parameter in your database is set to 1000 and undo retention is not guaranteed. Which statement regarding retention of undo data is correct？（）

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You received complaints about the degradation of SQL query performance. You identified top SQL queries that consume time. What would be your next step to find out recommendations about statistics collection and restructuring of the SQL statement to improve query performance？（）

Which three statements are true about the stages of database startup？（）

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The UNDO_RETENTION parameter in your database is set to 1000 and undo retention is not guaranteed. Which statement regarding retention of undo data is correct？（）

You received complaints about the degradation of SQL query performance. You identified top SQL queries that consume time. What would be your next step to find out recommendations about statistics collection and restructuring of the SQL statement to improve query performance？（）

Which three statements are true about the stages of database startup？（）