InnoDB: The MySQL 5.6.20 patch for Bug #16963396 / MySQL Bug #69477 limited the size of redo log BLOB writes to 10% of the redo log file size. This limitation has been relaxed. Redo log BLOB writes are now limited to 10% of the total redo log size (innodb_log_file_size * innodb_log_files_in_group).
As a result, innodb_log_file_size * innodb_log_files_in_group should be 10 times larger than the largest BLOB data size found in the rows of your tables plus the length of other variable length fields (VARCHAR, VARBINARY, and TEXT type fields). No action is required if innodb_log_file_size * innodb_log_files_in_group is already sufficiently large or if your tables contain no BLOB data. (Bug #73707, Bug #19498877)
Am 20.01.2015 um 21:17 schrieb Jeremy Cole:
If you don't care about recoverability (which is kind of what you're
saying here), you could always use MyISAM...
no you can't use MyISAM for DBMail
but the point is that the affected table itself has 90 MB, the log file size is 128 MB, the largest message is below 10 MB and so there is no valif reason at all to need more than 128 MB log file size
with 256 MB it works, fine given that there are 2 innodb logs that means for one of many tiny VM's 256 MB overhead at a way smaller dataset
in other words: given the numbers above 128 MB is for sure enough, the largest message is 8 MB x 10 = 80 MB - so why would the logfiles need to be 256 MB large?
On Tue, Jan 20, 2015 at 12:05 PM, Reindl Harald wrote:
Am 20.01.2015 um 20:53 schrieb Jeremy Cole:
Since I was the author of the bug this addressed, MySQL Bug 69477
<http://bugs.mysql.com/bug.__php?id=69477http://dev.mysql.com/doc/____relnotes/mysql/5.6/en/news-5-____6-20.html
<http://bugs.mysql.com/bug.php?id=69477>> I could comment here.
The InnoDB redo log (innodb_log_file_size) needs to be at least 10x
larger than the largest single BLOB value you intend to store, not
larger than the sum of BLOB data. If you are seeing this error
with a
log file size of 128 MB, that implies that you have some BLOB column
containing at least 12.8 MB. Is that the case? Your use is probably
quite strange if your total data size is only 129 MB and you
have BLOBs
of that size, but be aware: this bug fix was for a very serious bug.
With the previous behavior usage of such large BLOBs could result in
silent and unrecoverable data loss after a crash due to
overwriting the
most recent checkpoint with oversized BLOB data.
this is a tiny dbmail-testserver
there are a few testmessages, the largest one is 8.0 MB
on the other hand we support up to 35 MB mail size
the whole "dbmail_mimeparts" is around 90 MB
so *no*, i don't get any reason why i need > 128 MB
"innodb_log_file_size" for a "optimize table" AKA re-create
no idea what that possibly implies on a server storing larger files
for attachments in a web-app to "passthru" them with a PHP
application because the current error leads to make
"innodb_log_file_size" very large and clearly waste storage on a
virtualized environment ending innodb logs larger then the whole dataset
what i *really* hate in that behavior change is that you can't
happily change that config var at all on a production server and the
idea to increase it for safety to huge values larger then the data
itself
My understanding is that the bug was addressed in 5.7 without
introducing a limitation.
On Tue, Jan 20, 2015 at 1:22 AM, Reindl Harald wrote:
WTF: "the innodb_log_file_size setting should be 10 times
larger
than the largest BLOB data size found in the rows of your
tables" -
how is that maintainable for a sysadmin?
the whole (file_per_table) database folder is 129 MB,
innodb_log_file_size is 128 MB and nobody can seriously
explain me
that i need a innodb_log_file_size with magnitudes of the
whole datasize
Am 20.01.2015 um 03:04 schrieb Jean Weisbuch:
It seems that the limitation has been introduced on
MySQL 5.6.20 :
<http://dev.mysql.com/doc/__relnotes/mysql/5.6/en/news-5-__6-20.html>
<http://dev.mysql.com/doc/__relnotes/mysql/5.6/en/news-5-__6-20.html
<http://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-20.html>>
Le 20/01/2015 01:03, Reindl Harald a écrit :
InnoDB: The total blob data length (13476124) is
greater
than 10% of
the redo log file size (5120). Please increase
innodb_log_file_size
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