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ID# Date Updated Type Status Sev Version OS CPU Summary
1049782021-09-17
19:57
2021-09-20
9:02
MySQL Server: OptimizerVerified
(1004 days)
S58.0.26, 5.7.35WindowsAnyAdding Join Index forces query optimizer to use inefficient execution plan
673512012-10-24
8:02
2017-05-03
16:04
MySQL Server: PartitionsVerified
(4219 days)
S25.5.27-29.0LinuxAnyCardinality samples of partitioned tables sometimes widely off
1114312023-06-15
8:47
2023-06-26
14:48
MySQL Server: OptimizerVerified
(371 days)
S38.0.33Ubuntu (22.04)Other (x86_64)condition_fanout_filter optimizer wrong result?
294432007-06-29
13:28
2018-09-09
20:45
MySQL Server: OptimizerVerified
(4998 days)
S35.1.19AnyAnycost calculations are off
740832014-09-25
18:11
2014-10-09
12:58
MySQL Server: OptimizerVerified
(3542 days)
S55.6.20, 5.6.22Linux (CentOS 6.5)AnyENUM index scan is slower than INT index scan
303422007-08-09
18:52
2015-10-07
14:54
MySQL Server: OptimizerVerified
(3179 days)
S55.0.37, 5.6.17AnyAnyEquality propagation can make optimization much slower
1008852020-09-18
3:43
2020-11-09
11:38
MySQL Server: JSONVerified
(1371 days)
S55.7.31AnyAnygenerated column index against json column is not used with different encoding
996842020-05-25
12:19
2022-06-08
12:02
MySQL Server: OptimizerVerified
(1484 days)
S35.6, 5.7, 8.0AnyAnyincorrect determination of big test
800672016-01-20
10:50
2020-06-17
23:13
MySQL Server: OptimizerVerified
(3074 days)
S35.6.28, 5.7.10AnyAnyIndex on BIT column is NOT used when column name only is used in WHERE clause
1064732022-02-16
8:55
2022-03-10
9:27
MySQL Server: OptimizerVerified
(833 days)
S38.0.28AnyAnyInner table of OUT-JOIN is nullable, after applying OUTER2INNER transformation
860362017-04-21
10:08
2018-11-13
7:55
MySQL Server: InnoDB storage engineVerified
(2615 days)
S35.7/8.0AnyAnyInnoDB FULLTEXT index has too strict innodb_ft_result_cache_limit max limit
830622016-09-20
13:18
2018-04-24
20:15
MySQL Server: OptimizerVerified
(2829 days)
S35.6.32, 5.7.14, 5.6.33, 5.7.15AnyAnyit's no longer possible to determine used key parts by looking at key_length
1101172023-02-17
13:22
2023-02-17
15:32
MySQL Server: DocumentationVerified
(489 days)
S38.0AnyAnyLack of instrumentation for index condition impact on the query plan
711912013-12-20
15:30
2013-12-20
20:20
MySQL Server: OptimizerVerified
(3835 days)
S35.5.33AnyAnyLoose index scan is used even though full table scan/tight index scan is faster
711892013-12-20
14:56
2021-08-08
20:45
MySQL Server: DocumentationVerified
(3835 days)
S35.5, anyAnyAnyManual does not provide enough details on how loose index scan really works
1108482023-04-27
15:04
2023-05-03
9:59
MySQL Server: OptimizerVerified
(414 days)
S58.0.28, 8.0.33AnyAnymissing considering on order by and limit clause in cost calculation
1081272022-08-12
5:57
2022-08-16
13:34
MySQL Server: OptimizerVerified
(674 days)
S58.0.29AnyAnyMySQL optimizer chooses to a inefficient index .
429482009-02-17
23:02
2018-09-09
20:45
MySQL Server: OptimizerVerified
(5588 days)
S55.0.67-0ubuntu6, 6.0.11Linux (Ubuntu 8.10)AnyMySQL Optimizer does not properly use Indexes on Views with "Group By"
830712016-09-21
8:02
2016-09-21
8:34
MySQL Server: OptimizerVerified
(2829 days)
S35.7.14, 5.6.*, 5.7.15AnyAnyMySQL prefers first declared index over more useful other indexes
933602018-11-27
9:41
2018-12-12
14:48
MySQL Server: OptimizerVerified
(2017 days)
S55.6.16,5.7.23Linuxx86mysterious optimizer behavior
474542009-09-19
19:33
2018-09-09
20:45
MySQL Server: OptimizerVerified
(5387 days)
S35.1.35AnyAnyNot exists optimization method is not used for NULL columns in the right table
463762009-07-24
17:05
2018-09-09
20:45
MySQL Server: OptimizerVerified
(5440 days)
S55.0.85, 5.1.36, 5.1.38, 5.1.39Windows (XP)AnyOptimizer choose wrong index even when where clause and order-by are covered
1101112023-02-17
12:53
2023-02-20
12:35
MySQL Server: OptimizerVerified
(486 days)
S58.0.31AnyAnyOptimizer chooses worst plan when index condition pushdown opportunity
833232016-10-10
18:02
2018-04-13
12:41
MySQL Server: OptimizerVerified
(2614 days)
S35.7, 5.6, 8.0.1AnyAnyOptimizer chooses wrong plan when joining 2 tables
1129022023-10-31
14:39
2024-06-10
11:08
MySQL Server: OptimizerVerified
(115 days)
S58.0.31, 8.0.35Linux (n.a.)x86 (x86_64)Optimizer in MySQL 8 is significantly slower on dependent subqueries than 5.7
445492009-04-29
17:47
2018-09-09
20:45
MySQL Server: OptimizerVerifiedS35.0.80, 5.1.34AnyAnyoptimizer incorrectly chooses table scan and filesort over index
581012010-11-10
0:21
2018-09-09
20:45
MySQL Server: OptimizerVerified
(4970 days)
S55.1.38-community-log, 5.1.54-bzrLinuxAnyOptimizer picks wrong order of queries
685542013-03-03
16:16
2022-03-14
16:43
MySQL Server: OptimizerVerified
(4112 days)
S55.6.10AnyAnyOptimizer wrongly choses covering index over ICP
711992013-12-21
18:16
2014-01-28
17:45
MySQL Server: OptimizerVerified
(3832 days)
S35.6.14, 5.6.15, 5.5.35AnyAnyOptimizer's estimated number of rows is 2 times wrong for (loose?) index scans
832482016-10-03
15:57
2023-02-22
1:40
MySQL Server: OptimizerVerified
(2817 days)
S38.0.0, 5.7.15AnyAnyPartition pruning is not working with LEFT JOIN
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