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| ID# | Date | Updated | Type | Status | Sev | Version | OS | CPU | Summary |
|---|---|---|---|---|---|---|---|---|---|
| 68979 | 2013-04-17 3:47 | 2018-07-11 15:11 | MySQL Server: Optimizer | Verified (2913 days) | S5 | 5.6.10 | Linux | Any | performance regression of MySQL 5.6.10? |
| 74083 | 2014-09-25 18:11 | 2014-10-09 12:58 | MySQL Server: Optimizer | Verified (2408 days) | S5 | 5.6.20, 5.6.22 | Linux (CentOS 6.5) | Any | ENUM index scan is slower than INT index scan |
| 98770 | 2020-02-28 4:02 | 2020-03-03 15:05 | MySQL Server: Optimizer | Verified (436 days) | S5 | 8.0.19 | Any | Any | Non-covering full index scan is always preferred over table scan for GROUP BY |
| 93188 | 2018-11-14 11:16 | 2020-07-15 12:53 | MySQL Server: Optimizer | Verified (909 days) | S5 | 5.7 | Any | Any | Optimiser chose incorrect join order inside of derived table |
| 95020 | 2019-04-15 10:11 | 2019-04-24 13:02 | MySQL Server: Optimizer | Verified (751 days) | S5 | 5.7.25 | CentOS | Any | select no rows return but check profile process Creating sort index |
| 101459 | 2020-11-04 13:05 | 2020-11-05 12:00 | MySQL Server: Optimizer | Verified (189 days) | S5 | 5.6.50,5.7.32 | Any | Any | With more than one value in IN() clause, query skip index use. |
| 24251 | 2006-11-13 10:58 | 2018-09-09 20:45 | MySQL Server: Optimizer | In progress (4189 days) | S5 | 5.0.30-BK, 5.1.12 | Linux (Linux, Win XP SP2) | Any | Non-optimal choice of indexes for queries |
| 26832 | 2007-03-04 18:17 | 2011-04-05 14:46 | MySQL Server: Optimizer | Verified (3691 days) | S5 | 5.5 | Any | Any | ENUM types not optimized |
| 30342 | 2007-08-09 18:52 | 2015-10-07 14:54 | MySQL Server: Optimizer | Verified (2045 days) | S5 | 5.0.37, 5.6.17 | Any | Any | Equality propagation can make optimization much slower |
| 33381 | 2007-12-19 19:27 | 2018-09-09 20:45 | MySQL Server: Data Types | Verified (4237 days) | S5 | 5.0.45, 5.0.52, 5.1.40 | Linux | Any | Temporary table created on disk when it should be in ram |
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