MySQL全文索引、联合索引、like查询、json查询速度哪个快

查询背景

有一个表tmp_test_course大概有10万条记录，然后有个json字段叫outline，存了一对多关系(保存了多个编码，例如jy1577683381775)

我们需要在这10万条数据中检索特定类型的数据，目标总数据量：2931条

1	`select` `count(*)` `from` `tmp_test_course` `where` `type`=5 `and` `del=2` `and` `is_leaf=1`

我们在限定为上面类型的同时，还得包含下面任意一个编码（也就是or查询）

jy1577683381775
jy1577683380808
jy1577683379178
jy1577683378676
jy1577683377617
jy1577683376672
jy1577683375903
jy1578385720787
jy1499916986208
jy1499917112460
jy1499917093400
jy1499917335579
jy1499917334770
jy1499917333339
jy1499917331557
jy1499917330833
jy1499917329615
jy1499917328496
jy1576922006950
jy1499916993558
jy1499916992308
jy1499917003454
jy1499917002952

下面分别列出4种方式查询outline字段，给出相应的查询时间和扫描行数

一、like查询

耗时248毫秒

									select * from tmp_test_course 

									where `type`=5 and del=2 and is_leaf=1 

									and (

									outline like '%jy1577683381775%'

									or outline like '%jy1577683380808%'

									or outline like '%jy1577683379178%'

									or outline like '%jy1577683378676%'

									or outline like '%jy1577683377617%'

									or outline like '%jy1577683376672%'

									or outline like '%jy1577683375903%'

									or outline like '%jy1578385720787%'

									or outline like '%jy1499916986208%'

									or outline like '%jy1499917112460%'

									or outline like '%jy1499917093400%'

									or outline like '%jy1499917335579%'

									or outline like '%jy1499917334770%'

									or outline like '%jy1499917333339%'

									or outline like '%jy1499917331557%'

									or outline like '%jy1499917330833%'

									or outline like '%jy1499917329615%'

									or outline like '%jy1499917328496%'

									or outline like '%jy1576922006950%'

									or outline like '%jy1499916993558%'

									or outline like '%jy1499916992308%'

									or outline like '%jy1499917003454%'

									or outline like '%jy1499917002952%'

									)

MySQL全文索引、联合索引、like查询、json查询速度哪个快

explain分析结果如下，全表扫描

MySQL全文索引、联合索引、like查询、json查询速度哪个快

二、json函数查询

耗时196毫秒，速度稍微快了一点

									select * from tmp_test_course 

									where `type`=5 and del=2 and is_leaf=1

									and

									(

									json_search(outline, 'one', 'jy1577683381775') is not null or

									json_search(outline, 'one', 'jy1577683380808') is not null or

									json_search(outline, 'one', 'jy1577683379178') is not null or

									json_search(outline, 'one', 'jy1577683378676') is not null or

									json_search(outline, 'one', 'jy1577683377617') is not null or

									json_search(outline, 'one', 'jy1577683376672') is not null or

									json_search(outline, 'one', 'jy1577683375903') is not null or

									json_search(outline, 'one', 'jy1578385720787') is not null or

									json_search(outline, 'one', 'jy1499916986208') is not null or

									json_search(outline, 'one', 'jy1499917112460') is not null or

									json_search(outline, 'one', 'jy1499917093400') is not null or

									json_search(outline, 'one', 'jy1499917335579') is not null or

									json_search(outline, 'one', 'jy1499917334770') is not null or

									json_search(outline, 'one', 'jy1499917333339') is not null or

									json_search(outline, 'one', 'jy1499917331557') is not null or

									json_search(outline, 'one', 'jy1499917330833') is not null or

									json_search(outline, 'one', 'jy1499917329615') is not null or

									json_search(outline, 'one', 'jy1499917328496') is not null or

									json_search(outline, 'one', 'jy1576922006950') is not null or

									json_search(outline, 'one', 'jy1499916993558') is not null or

									json_search(outline, 'one', 'jy1499916992308') is not null or

									json_search(outline, 'one', 'jy1499917003454') is not null or

									json_search(outline, 'one', 'jy1499917002952') is not null

									)

MySQL全文索引、联合索引、like查询、json查询速度哪个快

explain分析结果如下，还是全表扫描

MySQL全文索引、联合索引、like查询、json查询速度哪个快

三、联合索引查询

下面为该表建立一个联合索引(本来想建一个type-del-is_leaf-outline的索引，但是outline字段太长限制，所以只加type-del-is_leaf的联合索引

1	`alter` `table` `tmp_test_course` `add` `key` `type-del-is_leaf` (`type`,`del`,`is_leaf`)

加入索引后再执行like和json查询，明显提速。
like执行用了136毫秒，json查询用了82.6毫秒，由此可见针对json类型使用json函数查询比like快

MySQL全文索引、联合索引、like查询、json查询速度哪个快

explain分析结果如下，两者查询扫描的行数都限定在了2931行

MySQL全文索引、联合索引、like查询、json查询速度哪个快

四、全文索引查询

因为全文索引只支持char、varchar和text，我们需要把json字段定义改一下

1	`alter` `table` `tmp_test_course` `modify` `outline` `varchar(1024)` `not` `null` `default` `'[]'`

添加全文索引

1	`alter` `table` `tmp_test_course` `add` `fulltext` `index` `outline (outline);`

现在再来用全文索引进行检索

									select * from tmp_test_course 

									where `type`=5 and del=2 and is_leaf=1

									and

									match(outline) against ('jy1577683381775 jy1577683380808 jy1577683379178 jy1577683378676 jy1577683377617 jy1577683376672 jy1577683375903 jy1578385720787 jy1499916986208 jy1499917112460 jy1499917093400 jy1499917335579 jy1499917334770 jy1499917333339 jy1499917331557 jy1499917330833 jy1499917329615 jy1499917328496 jy1576922006950 jy1499916993558 jy1499916992308 jy1499917003454 jy1499917002952')