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| ID# | Date | Updated | Type | Status | Sev | Version | OS | CPU | Summary |
|---|---|---|---|---|---|---|---|---|---|
| 24035 | 2006-11-07 8:57 | 2007-02-27 20:23 | MySQL Server: Optimizer | Closed (6275 days) | S5 | 5.0.34-BK, 5.0.26, 5.0.27 | Linux (Linux, FREEBSD) | Any | performance of update query difference between 5.0.22-log AND 5.0.27-log |
| 27479 | 2007-03-27 18:12 | 2007-05-30 7:26 | MySQL Server: Optimizer | No Feedback (6183 days) | S5 | 5.0.37 | Linux (Linux 2.6) | Any | ORDER BY performance regression |
| 30738 | 2007-08-31 3:36 | 2013-08-25 20:45 | MySQL Server: InnoDB storage engine | No Feedback (4549 days) | S5 | 5.0.37 | Any | Any | Concurrent disk sorts from InnoDB tables are much slower in MySQL 5 |
| 30760 | 2007-09-02 3:30 | 2008-02-10 5:28 | MySQL Server | No Feedback (5927 days) | S5 | 5.0.45 | Linux | Any | mysql 5.0.45 is slower than 5.0.41 and more than 5.0.33 |
| 29921 | 2007-07-20 3:39 | 2008-03-04 22:29 | MySQL Server: Parser | Closed (5904 days) | S5 | 5.0.37 | Any | Any | MYSQLparse uses 3X more CPU in MySQL 5.0 than yyparse in MySQL 4.0 |
| 29341 | 2007-06-25 16:17 | 2011-02-16 23:43 | MySQL Server: Security: Privileges | Won't fix (5394 days) | S5 | 5.0 | Any | Any | Performance regression if there are any column-level grants. |
| 36259 | 2008-04-22 17:11 | 2011-02-16 23:43 | MySQL Server: Optimizer | Duplicate (5442 days) | S5 | 5.0.54, 5.1.23, 5.1.24, 5.1.25 | Windows | Any | Optimizing with ORDER BY |
| 39630 | 2008-09-24 15:21 | 2011-06-30 15:04 | MySQL Server: Compiling | Unsupported (4691 days) | S5 | 5.0.68 | IBM AIX (5.3) | Any | AIX 5.3 64-bit binaries are too slow |
| 40634 | 2008-11-11 11:30 | 2011-02-16 23:43 | MySQL Server: MyISAM storage engine | Closed (5520 days) | S5 | 5.1.29, 6.0.x | Any | Any | table scan temporary table is 4x slower due to mmap instead instead of caching |
| 41740 | 2008-12-25 8:51 | 2011-08-16 1:21 | MySQL Server: Optimizer | Closed (4644 days) | S5 | 5.1.25,5.1.30 | Any | Any | MySQL 5.1 optimizer produces inefficient plan for complex queries |
| 44969 | 2009-05-19 23:31 | 2022-09-04 20:45 | MySQL Server: Optimizer | Duplicate (5257 days) | S5 | 5.1.34, 5.1.35, 5.1.38, 6.0 bzr | Linux (x64) | Any | index not being used anymore with order by query |
| 47330 | 2009-09-15 15:39 | 2018-09-09 20:45 | MySQL Server: Optimizer | Verified (5336 days) | S5 | 5.0.77, 5.1.34, 5.1.37 | Linux (Debian x64) | Any | Slow query with left join and having. |
| 45828 | 2009-06-29 15:55 | 2011-02-16 23:44 | MySQL Server: Optimizer | Closed (5384 days) | S5 | 5.1.35, 5.1.37-bzr, 5.4.0 | Any | Any | Optimizer won't use partial primary key if another index can prevent filesort |
| 50212 | 2010-01-10 14:07 | 2011-02-28 8:36 | MySQL Server: Optimizer | Closed (4813 days) | S5 | 5.1.37, 5.1.42, 5.1.43-bzr | Any | Any | MySQL doesn't use Primary Index for ORDER BY |
| 37264 | 2008-06-07 22:35 | 2018-09-09 20:45 | MySQL Server: Optimizer | Verified (5678 days) | S5 | 5.1.24-rc 5.1.29-rc 5.1.30 | Any | Any | MySQL wrongly uses filesort |
| 57489 | 2010-10-15 18:05 | 2011-02-16 23:44 | MySQL Server: InnoDB Plugin storage engine | Can't repeat (4877 days) | S5 | 5.5.6-rc | Any | Any | performance regression in 5.5.6-rc for IO bound sysbench |
| 59950 | 2011-02-04 16:23 | 2018-09-09 20:45 | MySQL Server: Optimizer | No Feedback (4409 days) | S5 | 5.5.8 | Linux (centos 5.5 64bit) | Any | Identical query taking longer on 5.5.8 compared to 5.1 |
| 60983 | 2011-04-26 23:00 | 2011-04-27 17:40 | MySQL Server: Stored Routines | Duplicate (4755 days) | S5 | 5.5.8-enterprise-commercial-advanced-log | Linux | Any | LIKE/REGEXP performance regression in stored functions |
| 60158 | 2011-02-17 12:33 | 2011-05-22 15:05 | MySQL Server: Stored Routines | Duplicate (4730 days) | S5 | 5.5.11 | Linux | Any | Time wasted in cleanup_items(Item*) due to size of free_list |
| 61401 | 2011-06-03 17:47 | 2011-06-16 19:49 | MySQL Server: Locking | Closed (4705 days) | S5 | MySQL 5.5.3+ | Any | Any | UPDATE performance degrades gradually if a trigger exists |
| 66567 | 2012-08-28 7:57 | 2012-11-13 18:32 | MySQL Server: Security: Privileges | Closed (4189 days) | S5 | 5.6.6, 5.6.7 | Any | Any | my_rnd_ssl() is very expensive for authentication |
| 69219 | 2013-05-13 20:14 | 2013-05-13 20:32 | MySQL Server: Optimizer | Verified (4008 days) | S5 | 5.6.12 | Any | Any | CREATE TEMPORARY TABLE ... SELECT is slower on 5.6 than on 5.1 |
| 30414 | 2007-08-14 17:09 | 2013-04-23 19:01 | MySQL Server: Logging | Closed (4028 days) | S5 | 5.1 | Any | Any | Slowdown (related to logging) in 5.1.21 vs. 5.1.20 |
| 71708 | 2014-02-13 15:19 | 2014-10-09 7:28 | MySQL Server: InnoDB storage engine | Closed (3494 days) | S5 | 5.6+ | Any | Any | 70768 fix perf regression: high rate of RW lock creation and destruction |
| 76933 | 2015-05-04 17:26 | 2016-11-16 15:56 | MySQL Server: Optimizer | Closed (2725 days) | S5 | 5.6.24, 5.6.25 | Linux | Any | Performance Regression in 5.6: Update does not use index |
| 75981 | 2015-02-20 13:56 | 2017-11-05 7:12 | MySQL Server: InnoDB storage engine | Verified (3312 days) | S5 | 5.7.6 | Any | Any | MySQL 5.7.5 30% slower than 5.6.23 for 1 thread write |
| 89149 | 2018-01-08 23:41 | 2018-01-16 17:07 | MySQL Server: Optimizer | Verified (2299 days) | S5 | 5.7.20 | Red Hat (7.4) | Any | SELECT DISTINCT on multiple TEXT columns is slow |
| 68366 | 2013-02-13 16:03 | 2018-01-18 13:19 | MySQL Server: Charsets | Closed (2297 days) | S5 | 5.5.29-0ubuntu0.12.10.1-log for debian- | Linux (Ubuntu 12.10) | Any | regression: >=mysql-5.4 utf8 collations are marked as not ascii compatible |
| 68979 | 2013-04-17 3:47 | 2018-07-11 15:11 | MySQL Server: Optimizer | Verified (3999 days) | S5 | 5.6.10 | Linux | Any | performance regression of MySQL 5.6.10? |
| 98750 | 2020-02-26 20:11 | 2020-05-21 12:09 | MySQL Server: Information schema | Closed (1444 days) | S5 | 8.0, 8.0.19 | Any | Any | SHOW FIELDS command regression on MySQL 8.0 |
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