What does mysql black hole do?

Mysql black hole is a special storage engine that does not store any data, but discards all write operations. It can also be used for delete operations. Using the traditional DELETE statement will cause writes to the database And the storage overhead increases dramatically, but if the storage engine of the table is switched to the black hole engine, all deletion operations will be silently discarded and no data will actually be deleted, thus saving the time and resources required to perform deletion operations.

mysql black hole is a special storage engine that does not store any data, but discards all write operations. It can also be used For deletion operations, using the traditional DELETE statement will cause a significant increase in database writing and storage overhead. However, if the storage engine of the table is switched to the black hole engine, all deletion operations will be silently discarded and no data will actually be deleted, thus saving the time and resources required to perform deletion operations.

The operating system of this tutorial: Windows 10 system, mysql version 8.0, Dell G3 computer.

MySQL blackhole (MySQL blackhole) is a special storage engine. It does not store any data, but discards all write operations. It is actually a storage engine similar to a black hole. Although this may sound strange, the black hole engine does have its special purpose and value.

First of all, we need to understand the background and significance of MySQL black hole. In the real world, we may encounter some special situations where we need to perform a certain write operation in the database, but we do not want to actually save the data in the database. For example, when we need to test data migration or backup and recovery scenarios, we may not want to leave any traces in the production database. At this time, MySQL black hole can come in handy.

When we use the MySQL black hole engine, all write operations are silently discarded and no data will be saved in the database. This process is useful for performance testing and data transfer testing. By sending write operations directly to the black hole engine, we can reduce the writing and storage overhead of the actual data and improve the performance of the system.

In addition, MySQL black hole can also be used for delete operations. When we need to delete a large amount of data, using the traditional DELETE statement will cause a significant increase in database writing and storage overhead. But if we switch the storage engine of the table to the black hole engine, all deletion operations will be silently discarded and no data will actually be deleted, thus saving the time and resources required to perform deletion operations.

Of course, MySQL black hole does not apply to all situations. It is only suitable for scenarios where you are not interested in write operations in the database. For read operations, we still need to use other storage engines, such as InnoDB or MyISAM. Therefore, before using MySQL Black Hole, we need to ensure that we truly understand the application scenario and ensure that the Black Hole engine will not have any impact on our data reading.

In practical applications, we can switch the storage engine of the MySQL table to the black hole engine through the following steps:

1. Create a black hole table with the same structure as the target table. The creation of this table Statements can refer to the definition of the target table.

2. Use the ALTER TABLE statement to switch the storage engine of the target table to BLACKHOLE.

3. When performing a write or delete operation, send the operation to the black hole table.

It should be noted that switching the storage engine may have some impact on the table structure and applications, so it needs to be used with caution in actual operations and fully tested and verified in the test environment.

To sum up, MySQL black hole is a special storage engine that can discard all write operations and is suitable for some special scenarios, such as testing data migration, backup and recovery solutions, and Deletion of large amounts of data. Although it cannot be used for data reading, in suitable scenarios, using the MySQL black hole engine can improve the performance and efficiency of the system.

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