introduce a new innodb command line option that will make compressed tables writable. by default they should be read-only. if the write support is enabled, it should print a warning on startup.
olafbuitelaar, thank you for your feedback. ALTER TABLE should only read the clustered index, not secondary indexes. In fact, rebuilding a table would fix corrupted secondary indexes (I hope that MDEV-22373 is fixed now, but it is too early to tell).
I hope that page_compressed together with compressed columns (MDEV-11371) would make an acceptable replacement of ROW_FORMAT=COMPRESSED. One piece that is missing is something that allows us to avoid the problematic use of sparse files in page_compressed. I think that we must provide an option to write page_compressed tables as normal non-sparse files and let the a smart SSD compress away the sequences of zero bytes, as explained in https://mariadb.org/fest2020/ssd/.
Marko Mäkelä
added a comment - olafbuitelaar , thank you for your feedback. ALTER TABLE should only read the clustered index, not secondary indexes. In fact, rebuilding a table would fix corrupted secondary indexes (I hope that MDEV-22373 is fixed now, but it is too early to tell).
I hope that page_compressed together with compressed columns ( MDEV-11371 ) would make an acceptable replacement of ROW_FORMAT=COMPRESSED . One piece that is missing is something that allows us to avoid the problematic use of sparse files in page_compressed . I think that we must provide an option to write page_compressed tables as normal non-sparse files and let the a smart SSD compress away the sequences of zero bytes, as explained in https://mariadb.org/fest2020/ssd/ .
Are there any creditable benchmarks on the CPU, I/O, and disk space for ROW_FORMAT=COMPRESSED? I have long been skeptical about the feature. I will continue to steer people away from using that setting.
Rick James
added a comment - Are there any creditable benchmarks on the CPU, I/O, and disk space for ROW_FORMAT=COMPRESSED? I have long been skeptical about the feature. I will continue to steer people away from using that setting.
Marko Mäkelä
added a comment - Based on https://github.com/nextcloud/server/issues/25436 NextCloud appears to be using ROW_FORMAT=COMPRESSED for InnoDB tables.
rjasdfiii, I remember that back in 2006 or 2007, when I had completed the implementation of ROW_FORMAT=COMPRESSED for the InnoDB Plugin for MySQL 5.0 based on some rough ideas of Heikki Tuuri, some performance tests were run, and the results were not great. I think that we really have to compare all performance aspects to page_compressed, as suggested in MDEV-22839.
Marko Mäkelä
added a comment - rjasdfiii , I remember that back in 2006 or 2007, when I had completed the implementation of ROW_FORMAT=COMPRESSED for the InnoDB Plugin for MySQL 5.0 based on some rough ideas of Heikki Tuuri, some performance tests were run, and the results were not great. I think that we really have to compare all performance aspects to page_compressed , as suggested in MDEV-22839 .
MDEV-27736 in MariaDB Server 10.6.6 essentially reverted this change, by changing the default value of innodb_read_only_compressed to OFF. The plan to remove support for InnoDB ROW_FORMAT=COMPRESSED tables (MDEV-22367) has been cancelled.
Marko Mäkelä
added a comment - MDEV-27736 in MariaDB Server 10.6.6 essentially reverted this change, by changing the default value of innodb_read_only_compressed to OFF . The plan to remove support for InnoDB ROW_FORMAT=COMPRESSED tables ( MDEV-22367 ) has been cancelled.
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Marko Mäkelä
Sergei Golubchik
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Task
Major
MDEV-24503 Assertion `m_prebuilt->trx == thd_to_trx(m_user_thd)' failed in ha_innobase::is_read_only
olafbuitelaar, thank you for your feedback. ALTER TABLE should only read the clustered index, not secondary indexes. In fact, rebuilding a table would fix corrupted secondary indexes (I hope that
MDEV-22373is fixed now, but it is too early to tell).I hope that page_compressed together with compressed columns (
MDEV-11371) would make an acceptable replacement of ROW_FORMAT=COMPRESSED. One piece that is missing is something that allows us to avoid the problematic use of sparse files in page_compressed. I think that we must provide an option to write page_compressed tables as normal non-sparse files and let the a smart SSD compress away the sequences of zero bytes, as explained in https://mariadb.org/fest2020/ssd/.