Encrypting Doublewrite Buffers¶
The two types of doublewrite buffers used in Percona Server for MySQL are encrypted differently.
When the InnoDB system tablespace is encrypted, the
doublewrite buffer pages
are encrypted as well. The key which was used to encrypt the InnoDB system
tablespace is also used to encrypt the doublewrite buffer.
Percona Server for MySQL encrypts the
doublewrite buffer with the respective
tablespace keys. Only encrypted tablespace pages are written as encrypted in the
doublewrite buffer. Unencrypted tablespace pages will be written as
Dynamic: Yes Scope: Global Variable Type: Boolean Default Value:
Enables the encryption of the doublewrite buffer. For encryption, uses the key of the tablespace where the doublewrite buffer is used.