Mysql database backup usage scenarios

Do you really understand what kind of scenarios you will face when doing database backup?

I think anyone who has maintained a database knows that the database needs to be backed up, and also knows that backing up the database is an essential thing for database maintenance. So does everyone know what scenarios the backups they have made are intended to deal with? Or do we all know clearly why a database needs to be backed up? After reading this, I think many readers will sneer, "Isn't the function of backup just to prevent the original data from being lost? Who doesn't know this?" Indeed, the role of database backup to a large extent is to facilitate the retrieval of lost data when part or all of the data in our database is lost due to some reasons. However, different types of database backups can cope with different situations. Moreover, database backup also has many other functions. And I think everyone may have some differences in their understanding of the role of database backup.

Below I will list some of the more common situations that I personally understand that we may need to use database backup.

1. Data loss application scenarios

1. Human error causes some data to be mishandled;

2. Software BUG causes partial or complete loss of data;

3. Hardware failure causes partial or complete loss of database data;

4. Security vulnerabilities have been compromised and data has been maliciously destroyed;

2. Non-data loss application scenarios

5. Data recovery based on time points in special application scenarios;

6. Development and testing environment database construction;

7 , Building a new environment for the same database;

8. Database or data migration;

The above listed are just some common application scenarios. In addition to the above scenarios, there are many other application scenarios for database backup. I won’t list them all here. So, readers, have you ever done or are doing database backups to deal with one (or several) of the above scenarios? In other words, which of the above application scenarios can our database backup handle? I don’t know if everyone has considered this issue.

We must admit that no database backup can solve all the common application scenarios listed above. Even the various scenarios of data loss cannot be perfectly solved by a certain database backup, and of course it is not necessary. It is said that it can solve all backup application scenarios.

For example, when we encounter a disk failure and lose all data in the entire database, and cannot recover from the failed hard disk, we may have to backup the database through a real-time or short-term replication backup. Of course, if there is no such database, you must have the latest physical or logical backup data of the entire database, as well as all physical or logical incremental backups after the backup, in order to restore the data to the most recent time before the failure as much as possible. time point. And when we encounter a situation where we think that an operation error has caused the data to be misoperated, we need to have a backup that can be restored to the moment before the incorrect operation time. Of course, this backup may be a backup of the entire database, or it may just be a misoperation. Backup of the table. When we do cross-platform database migration, all we need is a logical database backup, because platform differences may make the physical backup file format incompatible on the two platforms.

Since no database backup can perfectly solve all application scenarios, and the database backup application scenarios that each database environment needs to face may be different, it may just need to face many scenarios. One or several types, then it is very necessary for us to specify a suitable backup plan and backup strategy to meet our needs through the simplest technology and the lowest cost.

The above is the content of Mysql database backup usage scenarios. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!