Comments - InnoDB Page Compression
Content reproduced on this site is the property of its respective owners,
and this content is not reviewed in advance by MariaDB. The views, information and opinions
expressed by this content do not necessarily represent those of MariaDB or any other party.
I spent the whole day to find why an *.ibd file after using page compression has the same size as the uncompressed one. This documentation lacks clarification that in order to "check" that page compression is working, one must use 'dd' command or 'ls' with '-s' flag to check the real size of an ibd file (it's a sparse file https://en.wikipedia.org/wiki/Sparse_file). I found the answer here https://jira.mariadb.org/browse/MDEV-8250