Three tips to help you test Oracle Database Backup

Database Backup is an important means to ensure database security. Most database administrators have discovered the importance of backing up databases, and even have great dependence on them. Therefore, the database administrator must ensure that the backup policy is reliable. An untested backup policy is worse than a backup policy, because it gives database administrators a false sense of security.

However, I found that many database administrators may encounter problems such as failure to use the faulty file to restore the database or Incomplete Database Backup files when encountering server faults. This is mainly because everyone only pays attention to the database backup policy, but ignores the test policy of the database backup file. If the backup file is incomplete or an error occurs, it would be better to set up a backup policy in a timely manner. For this reason, I would like to solemnly suggest that the database backup test policy is as important as the database backup policy. As an Oracle database administrator, how can we do this test? I have a few tips to help you solve this problem.

Method 1: Simulate various problems that may occur in reality.

There are many causes for database server strikes, which may result in damage to existing data in the database. Therefore, the database administrator must use his or her own experience to list potential faults. Then, we can test whether the existing backup policy can effectively cope with these possible faults.

For example, after I deploy an Oracle database for an enterprise, I usually simulate various problems that may occur in reality. Then perform a one-to-one test on these issues. For example, I will suddenly turn off the power in the process of updating the transaction processing. Then restart the database server to check the impact of the power failure on the server? Can I use the existing Backup files and log files to restore the data in the database to the power-off point? For example, the author will also test that a large amount of data has been updated by the user error and the transaction has been submitted. In this case, we need to test whether we can use the redo day to file to restore the data before the update? For example, if an enterprise uses a disk array, the author also needs to test the validity of the disk array. For example, remove a hard disk and add a new hard disk to check whether the database server can restore data normally. In a word, we can simulate various failures and recover from these failures to see if the fault can be recovered to the point where the fault occurred. These tests will give database administrators invaluable experience from books.

Specifically, I believe that when the database administrator fails to simulate the simulation, the following failure causes cannot be ignored. First, the server suddenly loses power, which may lead to an error in the configuration file, leading to access failure or data loss. Second, the redo log is damaged, this may cause the database administrator to fail over the data recovery to the point where the fault occurred; 3. Data loss caused by the hard disk failure, mainly to test the effectiveness of remote storage of backup files; 4. Batch update error handling. This mainly tests whether Database Administrators have the habit of backing up databases before performing batch update. The Database Administrator only needs to simulate various possible problems in the real world in advance and obtain a solution. Only in this way can the database administrator solve these problems quickly.

Of course, these tests are best performed on another host. It is not wise to perform these destructive tests on production servers.

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