https://www.fromdual.com/blog/shrinking-innodb-system-tablespace-file-ibdata1-poc/comment-662/Recent content in The I_S.INNODB_BUFFER_PAGE on FromDual GmbHHugoen-GBoli.sennhauser@fromdual.com (Oli Sennhauser)oli.sennhauser@fromdual.com (Oli Sennhauser)© FromDual GmbHTue, 11 Dec 2012 08:49:16 +0200https://www.fromdual.com/blog/shrinking-innodb-system-tablespace-file-ibdata1-poc/comment-662/Tue, 11 Dec 2012 08:49:17 +0200oli.sennhauser@fromdual.com (Oli Sennhauser)https://www.fromdual.com/blog/shrinking-innodb-system-tablespace-file-ibdata1-poc/comment-662/<p>The I_S.INNODB_BUFFER_PAGE query seems unsafe to me, as it queries the buffer pool and not the tablespace. The innochecksum approach to find unused pages at the end to truncate + header field patching seems to be as OK as it could possibly be given the method.</p> <p>It seems that implementing the truncate of unused tablespace trailer would not be that hard (say, in XtraDB), and compacting with page relocation should be possible too with more effort. I wonder if it&rsquo;s on InnoDB roadmap.</p>