1Z0-052 認定試験トレーリング、1Z0-820 試験解答

Which two statements are true about checkpointing? (Choose two.)
A. The checkpoint frequency decreases with the smaller redo log file size.
B. It ensures that all committed data is written to the data files during normal shutdown.
C. It prompts the Checkpoint (CKPT) process to write data to the data files and redo information to
the online redo log files.
D. The frequent full checkpoint in a database can cause the overall degradation of the database
Answer: B,D

1Z0-052 問題例   
Checkpoint Process (CKPT)
A checkpoint is a data structure that defines a system change number (SCN) in the redo thread of a
database. Checkpoints are recorded in the control file and in each data file header. They are a crucia
element of recovery.
When a checkpoint occurs, Oracle Database must update the headers of all data files to record the
details of the checkpoint. This is done by the CKPT process. The CKPT process does not write blocks to
disk; DBWw always performs that work. The SCNs recorded in the file headers guarantee that all
changes made to database blocks prior to that SCN have been written to disk.
The statistic DDWR checkpoints displayed by the SYSTEM_STATISTICS monitor in Oracle Enterprise
Manager indicate the number of checkpoint requests that have completed.

Which two statements are true regarding undo tablespaces? (Choose two.)
A. The database can have more than one undo tablespace
B. Undo segments automatically grow and shrink as needed, acting as circular storage buffer for their
assigned transactions
C. The UNDO_TABLESPACE parameter is valid in both automatic and manual undo management
D. An undo tablespace is automatically created if the UNDO_TABLESPACE parameter is not set and
the UNDO_MANAGEMENT parameter is set to AUTO during the database instance start up
Answer: A,B

1Z0-052 体験記   

Your database instance is functional for the past one month. The Automatic Workload
Repository (AWR) snapshot retention is set to 7 and the STATISTICS_LEVEL initialization parameter is
set to TYPICAL. You receive a complaint about the poor performance of the database between 7 PM
and 9 PM of the previous day. Choose two actions any of which can be referred to first to diagnose
the problem. (Choose two.)
A. Use the Active Session History report.
B. Use an ADDM analysis between 7 PM and 9 PM of the previous day.
C. Use the AWR Compare Periods report.
D. Use the AWR Compare Period report between 7 PM and 9 PM of the previous day.
Answer: B,C

1Z0-052 基礎   

Which is true about the SYSTEM and SYSAUX tablespaces?
A. The SYSAUX tablespace can be made read-only but the SYSTEM tablespace cannot
B. Both tablespaces must be online for a database to be accessible
C. Only the SYSTEM tablespace contains data dictionary tables
D. Both tablespaces can be used for temporary storage if no temporary tablespace is defined
Answer: A

1Z0-052 ガイド   

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