Importance of Oracle Database Backup

Oracle Database Backup is one of our most common operations. Let's take a look at the importance of Oracle Database backup. We hope that you will have a deeper understanding of Oracle Database Backup.

It can be said that since the birth of the computer system, the concept of backup has emerged. Computers have replaced many human tasks with their powerful speed processing capabilities. However, many times, it is so weak that the chip on the motherboard, the motherboard circuit, memory, power supply, and so on cannot work normally, it will cause the computer system to not work normally. Of course, these damages can be repaired without causing application and data corruption. However, if the computer's hard disk is damaged, data will be lost. At this time, you must use backup to restore data.

In fact, in our real world, there are already many backup strategies, such as RAID technology, dual-machine hot backup, and cluster technology development is not the backup and high availability of computer systems? In many cases, the system backup can solve the database backup problem. For example, if the disk medium is damaged, you can perform simple restoration from the mirror or simply switch the machine. However, the system backup policy mentioned above is designed to consider backup and recovery from the hardware perspective, which is costly. We can choose the Oracle database backup policy based on the ratio of the cost of data loss to the cost of ensuring that data is not lost. In other cases, hardware backup sometimes cannot meet the actual needs. If you accidentally delete a table but want to restore it, database backup becomes more important. ORACLE itself provides powerful backup and recovery policies.

Backup is the process of copying a database to a dump device. A dump device is a tape or disk used to store database copies. The recovery depends on the Oracle database backup. As a DBA, it is the responsibility to maintain database recoverability in the following three aspects:
· Minimize the number of database failures, so that the database can maintain maximum availability;
· When the database inevitably fails, the recovery time should be minimized to maximize the recovery efficiency;
· When the database fails, make sure that as little data as possible is lost or not lost at all, so that the data has the maximum recoverability.

The most important task of disaster recovery is to design a hard disk backup process with sufficient frequency. The Oracle database backup process should meet the requirements of the system. For example, if the database can be shut down for a long time, you can perform a cold backup once a week and archive the redo logs. For 24x7 systems, we may only consider hot backup. It would be ideal to back up data every day, but we should consider its reality. Enterprises are looking for ways to reduce maintenance costs, so real solutions can be used. As long as you plan carefully and try to reach the bottom line of Database Availability, it is also possible to successfully back up and restore the database with a small amount of money.
 

How to Implement ORACLE backup

Oracle backup command to use instances

Oracle single row date functions

Introduction to Oracle bitand () Functions

Use of oracle Aggregate functions