Email report from Oli Sennhauser
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I think I found a docu bug in the change_buffer docu.
https://mariadb.com/kb/en/innodb-change-buffering/

Innodb_buffer_pool_pages_dirty: Number of dirty pages in the Change Buffer.
contradicts:

Number of InnoDB buffer pool pages which contain dirty (modified) data
https://mariadb.com/kb/en/innodb-status-variables/#innodb_buffer_pool_pages_dirty

Number of dirty pages in the Change Buffer. -> Number of dirty pages in the Buffer Pool.

And thus IMHO the whole chapter (Change Buffer Related Status Variables) becomes obsolete?

According to MySQL Docu: Change Buffer Related Status Variables can be found in the SHOW ENGINE INNODB STATUS output, in I_S.INNODB_METRICS and I_S.INNODB_BUFFER_PAGE