Oracle Backup And Recovery Tutorial
In this tutorial, we will discuss the Oracle backup and recovery process.
Oracle Database Backup
Oracle database backups are used to protect your data in the event of a system failure. They can also be used to restore data in the event of data loss or corruption.
There are two types of Oracle backups: online backups and offline backups.
Online backups are backups of the entire database that are taken while the database is online. They are used to protect against data loss caused by logical errors, such as incorrect SQL statements.
Offline backups are backups of the entire database that are taken while the database is offline. They are used to protect against data loss caused by system failures, such as a crashed server.
Oracle Database Recovery
Oracle database recovery is the process of restoring a database to a previous state. This can be used to recover data that was lost or corrupted, or to restore a database to a previous state after a system failure.
There are two types of Oracle database recovery: logical recovery and physical recovery.
Logical recovery is the process of recovering data from backups. This is used to recover data that was lost or corrupted due to logical errors, such as incorrect SQL statements.
Physical recovery is the process of recovering data from backups and restoring the physical structure of the database. This is used to recover data that was lost or corrupted due to system failures, such as a crashed server.
Contents
How do I backup and restore an Oracle database?
An Oracle database stores data in tablespaces. You can use the export utility to create a dump file of a tablespace or the entire database. You can use the import utility to import a dump file into a database.
To back up an Oracle database:
1. Shut down the database.
2. Make a copy of the datafiles and control files.
3. Issue the export utility command to create a dump file.
4. Copy the dump file to a safe location.
To restore an Oracle database:
1. Start up the database in mount mode.
2. Issue the import utility command to import the dump file.
3. Mount the tablespaces.
4. Run the recovery utility.
What are the 3 types of backups?
There are three types of backups: full, incremental, and differential.
A full backup is a complete backup of all files on a system. This is the most time-consuming type of backup, but it is also the most comprehensive.
An incremental backup copies only the files that have changed since the last backup. This type of backup is quicker and requires less storage space than a full backup, but it is not as comprehensive.
A differential backup copies all files that have changed since the last full backup. This type of backup is also quicker and requires less storage space than a full backup, but it is not as comprehensive as a incremental backup.
How do you backup an Oracle database?
Oracle databases are one of the most popular database systems in use today. They are used by businesses of all sizes for a variety of purposes. As with any critical system, it is important to have a backup plan in place in case of a disaster.
Backing up an Oracle database can be done in a number of ways. The most common method is to use the Oracle Export utility. This utility can be used to create a backup of the entire database, or just a subset of the data. It can also be used to create a backup of the schema, or the structure of the database.
Another way to back up an Oracle database is to use the Oracle Data Pump utility. This utility can be used to copy data between databases, or to copy data from one Oracle database to another. It can also be used to create a backup of the entire database, or just a subset of the data.
Another option is to use the RMAN utility. This utility can be used to create backups of both the data and the schema. It can also be used to create backups of individual tables, or of specific data blocks.
No matter which method you choose, it is important to test your backups regularly to make sure they are working correctly.
What is Level 0 and Level 1 backup?
There are three types of backups: full, differential, and incremental.
Full backups copy all files from the source. Differential backups copy all files that have been created or changed since the last full backup. Incremental backups copy only files that have been created or changed since the last backup, regardless of whether it was full, differential, or incremental.
Level 0 backups are full backups, Level 1 backups are differential backups, and Level 2 backups are incremental backups.
What is difference between restore and recovery in Oracle?
Oracle restore and recovery are two different processes that are used to protect data in an Oracle database. Restore is used to restore a previous version of the database, while recovery is used to recover the database if it becomes corrupted.
The restore process copies the datafiles and control files from the backup media to the original location. The recovery process restores the datafiles and control files to their original location, and then recovers the database using the archived redo logs.
The main difference between restore and recovery is that the restore process copies the datafiles and control files to the original location, while the recovery process restores the datafiles and control files to their original location and then recovers the database using the archived redo logs.
What are the types of recovery?
There are many different types of recovery. This is a list of some of them:
1. Emotional Recovery-This is the process of moving from a state of emotional distress to a place of healing. It can involve gaining a better understanding of what happened, grieving any losses, and developing a new sense of self.
2. Physical Recovery-This is the process of restoring physical health and well-being. It can involve repairing any damage done to the body, regaining lost function, and returning to a state of health.
3. Mental Recovery-This is the process of restoring mental health and well-being. It can involve gaining a better understanding of the trauma, developing coping skills, and rebuilding self-esteem.
4. Social Recovery-This is the process of rebuilding social connections and relationships. It can involve rebuilding trust, finding new support systems, and reclaiming a sense of belonging.
5. Spiritual Recovery-This is the process of restoring a sense of meaning and purpose in life. It can involve finding new spiritual beliefs, reconnecting with a higher power, or simply finding new meaning in life.
What are the 4 types backup?
There are four types of backups: full, differential, incremental, and synthetic full.
A full backup backs up all of the files on a computer. This type of backup is usually done once a week or once a month.
A differential backup backs up all of the files that have changed since the last full backup. This type of backup is usually done every day.
An incremental backup backs up only the files that have changed since the last incremental or full backup. This type of backup is usually done every few hours.
A synthetic full backup is a combination of an incremental and a full backup. It backs up all of the files that have changed since the last full backup, and then it makes a full backup of all of the files that have changed since the last incremental backup.
