English: The number of pages busy because they have been allocated for administrative overhead such as row locks or the adaptive hash index. This value can also be calculated as Innodb_buffer_pool_pages_total - Innodb_buffer_pool_pages_free - Innodb_buffer_pool_pages_data.
Dutch: Het aantal pagina's dat in gebruik is voor administratieve doeleinden, zoals rij-locks of hash-indexen. Deze waarde kan worden berekend als Innodb_buffer_pool_pages_total - Innodb_buffer_pool_pages_free - Innodb_buffer_pool_pages_data.