Which two statements about the background process of thedatabase writerare true（） A、It is possible to have multiple database writers in an Oracle instance.B、It writes dirty buffers， if any， to data files whenever a checkpoint occurs.C、It writes dirty buff

第1题：

You are analyzing the components of the redo log mechanisms in your Oracle database. Which of the following purposes does the CKPT process serve?（）

• A、Writes buffers to disk 
• B、Writes current redo log number to datafile headers 
• C、Writes redo log information to disk 
• D、Reads information into memory for users

第2题：

Which  statements are true about checkpointing（）

• 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、The frequent full checkpoint in a database can cause the overall degradation of the database performance.
• D、It prompts the Checkpoint （CKPT） process to write data to the data files and redo information to the onlineredo log files

第3题：

Which background process sequentially writes Flashback Database data from the flashback buffer to the Flashback Database logs？（）

• A、 DBWn
• B、 RECO
• C、 RVWR
• D、 LGWR

第4题：

Which two statements are true about checkpointing（）

• 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、The frequent full checkpoint in a database can cause the overall degradation of the database performance.
• D、It prompts the Checkpoint （CKPT） process to write data to the data files and redo information to the online redo log files.

第5题：

Which statements are true about logical structures of the Oracle database（）

• A、Each segment contains one or more extents.
• B、Multiple tablespaces can share a single data file
• C、A data block is the smallest unit of input/output （I/O） in data files.
• D、It is possible to have tablespaces of different block sizes in a database.
• E、Each data block in the database always corresponds to one operating system block

第6题：

SQ L*Loader is a utility that can perform which two tasks？（）

• A、Load data from a disk， tape， or named pipes.
• B、Load data into an Oracle database using DML statements.
• C、Extract， reorganize， and insert data within an Oracle database.
• D、Load data from external files into tables in an Oracle database.
• E、Load data into an Oracle database using operating system commands.
• F、Load data directly from a non-Oracle database to an Oracle database.

第7题：

If you create your database using Oracle Managed Files （OMF）， what is true？（）

• A、You must use Oracle predefined names to identify raw partitions that will hold OMF structures. 
• B、You must define directories for two online redo log groups and three copies of the control file. 
• C、If your CREATE DATABASE command fails, any OMF database files that have already been created will be dropped automatically. 
• D、You must use only OMF data files when adding new tablespaces or data files to your database in the future.

第8题：

Which statement is true regarding the Archiver （ARCn） process，archived log files，and recovery？ （）

• A、A database backup, combined with archived redo log files, guarantees that all committed data can be recovered to the point of failure. 
• B、During recovery the ARCn background process copies its redo entries identified for recovery by the control file to the data files. 
• C、After each write to an archived log, the mandatory background process ARCn writes its log sequence number and the first and last SCN number within the log sequence to the control file. 
• D、At database recover time, and archived redo log is uniquely identified for recovery use by its redo thread number and destination ID number retrieved from the control file.

第9题：

After performing a clean shut down of the database instance for maintenance， you mount thedatabase and then execute a command to open the database： SQL> ALTER DATABASE OPEN；  Which two statements are true（）

• A、The online redo log files and online data files are opened.
• B、All the online data file headers are checked for consistency.
• C、Instance recovery is performed before opening the database.
• D、The path and existence of all the log file members are checked

第10题：

The database Is configured in ARCHIVELOG mode. The database needs to be up 24 X 7. You want to perform user managed backup for the data files of the HR_DATA tablespace.To accomplish the task, you issued the following command: SQL> ALTER TABLESPACE hi_data BEGIN BACKUP; Which two statements are true in this scenario? （）

• A、No transaction on the tablespace is allowed but you can perform queries.
• B、The tablespace will automatically come out of backup mode when the file copy is complete.
• C、The checkpoint change number is frozen in headers of the data files until the file is removed from backup mode.
• D、The database writes the before image of an entire block to the redo stream before modifying. block tor the first time.