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Oracle Backup and Recovery Interview Questions & Answers - Learning Mode
COOLINTERVIEW.COM ORACLE INTERVIEW QUESTIONS ORACLE BACKUP AND RECOVERY INTERVIEW QUESTIONS QUESTIONS & ANSWERS - LEARNING MODE

Oracle Backup and Recovery Interview Questions & Answers - Learning Mode

Backup and recovery is one of the most important aspects of database administration. If a database crashed and there was no way to recover it, the devastating results to a business could include lost data, lost revenue and customer dissatisfaction. Recovery Manager (RMAN) is an Oracle utility that can back up, restore, and recover database files. It is a feature of the Oracle database server and does not require separate installation. You can also use operating system commands for backups and SQL*Plus for recovery.

Try Oracle Backup and Recovery Interview Questions & Answers - Exam Mode

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Oracle Backup and Recovery Interview Questions & Answers - Learning Mode
Try Oracle Backup and Recovery Interview Questions & Answers - Exam Mode
Question: What is db_recovery_file_dest ? When do you need to set this value ?
Give me the steps to perform the point in time recovery with a backup which is taken before the reset logs of the db ?
Tell me about the steps required to enable the RMAN backup for a target database ?


Answer: db_recovery_file_dest specifies a default location of flash recovery area which contains multiplexed current control files,
online redo logs as well as archived logs, Rman backups,flash back logs.
db_recovery_file_dest_size should be specified as well. Source: CoolInterview.com
Question: What is the difference between media recovery & crash recovery..?



Answer: Media recovery is a process to recover database from backup when physical disk failure occure.

cash recovery is a automated process take care by oracle when instance failure occure.
Source: CoolInterview.com
Question: What is an Oracle database Partial Backup?

Answer: A Partial Backup is any operating system backup short of a full backup, taken while the database is open or shut down.
Source: CoolInterview.com
Question: What are the different tools available for hot backups. Is it preferable to take it manually all the time or it depends on the size of the database.



Answer: See A hot backup can be done by either RMAN,User Managed Backups by puting tablespace in backup mode my OEM which does the same as the user managed backup.But the Backup depends upon the size of the database you are using . if the database size in TB the RMAN backup will take more than 10 hours to complete and if the database is critical you can' wait for long to go for so long in this case their are special backup techniques which are given by vendors like TIVOLI and Netbackup they provide Source: CoolInterview.com
Question: What is the difference between recovery and restoring of the oracle database?

Answer: Here is a scenario to understand Restore & Recovery

Sunday 10pm: Database is backed up. and is running fine.

Monday 11am: Went down / crashed due to some reason.

To bring up the database, we have 2 options:

1. Simple Restore: copying files from backup taken sunday night and open the database. Here, we loose all the changes that are done since sunday night.

2. Restore and Recovery: Copying files from backup taken sunday night and applying all the archivelog and Source: CoolInterview.com
Question: What are the different tools available for hot backups in Oracle? Is it preferable to take it manually all the time or it depends on the size of the database?


Answer: A hot backup can be done by either RMAN,User Managed Backups by puting tablespace in backup mode my OEM which does the same as the user managed backup.But the Backup depends upon the size of the database you are using . if the database size in TB the RMAN backup will take more than 10 hours to complete and if the database is critical you can' wait for long to go for so long in this case their are special backup techniques which are given by vendors like TIVOLI and Netbackup they provide BC V Source: CoolInterview.com
Question: What is the disk migration?what isthe steps involved in diskmigration?



Answer: Disk migration is noting but, migration of data from one OS dependent database to another Dependent database. The steps involved in this are

- first go to your target database and export all your data into flat files

-next in the destination database during the installation of the database, it asks for data source ,instead of giving the data of the oracle provided , give the path of the flat file you exported previously .


Source: CoolInterview.com
Question: What is Restricted Mode of Instance Startup in Oracle?

Answer: To Enable Restricted Session

Alter system enable restricted session;

To Disable Restricted Session

Alter system disable restricted session;

To Start the Database in Restricted Mode

STARTUP RESTRICT

By starting Instance in restricted mode it will not allow all users to access and only users with restriction privilege will be allowed to access.
This will be done time of make some data changes so that no users should be allowed to access data on time of Source: CoolInterview.com
Question: What is an Oracle database Full Backup?

Answer: A full backup is an operating system backup of all data files, on-line redo log files and control file that constitute ORACLE database and the parameter.
Source: CoolInterview.com
Question: What is Restricted Mode of Instance Startup ?



Answer: To Enable Restricted Session

Alter system enable restricted session;

To Disable Restricted Session

Alter system disable restricted session;

To Start the Database in Restricted Mode

STARTUP RESTRICT
Source: CoolInterview.com
Question: What is the difference between oracle media recovery and crash recovery?

Answer: Media recovery is a process to recover database from backup when physical disk failure occure.

cash recovery is a automated process take care by oracle when instance failure occure.
Source: CoolInterview.com
Question: What are the advantages of operating a database in ARCHIVELOG mode over operating it in NO ARCHIVELOG mode ?



Answer: Database in archivelog mode chance to take hot backup and no data loss in recovery. you can use RMAN for backup and recovery .disadvantage is poor ferformance, and more chance to crash disc.
Source: CoolInterview.com
Question: What is the difference between recovery and restoring of the database.



Answer: Here is a scenario to understand Restore & Recovery

Sunday 10pm : Database is backed up. and is running fine.

Monday 11am : Went down / crashed due to some reason.

To bring up the database, we have 2 options:

1. Simple Restore : copying files from backup taken sunday night and open the database. Here, we loose all the changes that are done since sunday night.

2. Restore and Recovery: Copying files from backup taken sunday night and applying all the archivelog Source: CoolInterview.com
Question: What do you mean by MEDIA RECOVERY..?



Answer: When physical disk fail, physical database file corrupt then media recovery required Source: CoolInterview.com

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