1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199
| --------------
SET AUTOCOMMIT = 0
--------------
--------------
START TRANSACTION
--------------
--------------
DROP DATABASE IF EXISTS `base`
--------------
--------------
CREATE DATABASE IF NOT EXISTS `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
--------------
--------------
DROP TABLE IF EXISTS `test`
--------------
--------------
CREATE TABLE `test` (
`col1` int UNSIGNED NOT NULL,
`col2` int UNSIGNED NOT NULL,
PRIMARY KEY (`col1`)
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
--------------
--------------
insert into `test` (`col1`,`col2`) values (1, 9),(2, 8),(3, 7),(4, 6),(5, 5),(6, 4),(7, 3),(8, 2),(9, 1)
--------------
--------------
show session status like 'Innodb_buffer_pool_read_requests'
--------------
+----------------------------------+-------+
| Variable_name | Value |
+----------------------------------+-------+
| Innodb_buffer_pool_read_requests | 68009 |
+----------------------------------+-------+
--------------
select VARIABLE_VALUE into @a1 from information_schema.GLOBAL_STATUS where VARIABLE_NAME = 'Innodb_buffer_pool_read_requests'
--------------
--------------
select col1, col2 from test
--------------
+------+------+
| col1 | col2 |
+------+------+
| 1 | 9 |
| 2 | 8 |
| 3 | 7 |
| 4 | 6 |
| 5 | 5 |
| 6 | 4 |
| 7 | 3 |
| 8 | 2 |
| 9 | 1 |
+------+------+
--------------
select VARIABLE_VALUE into @b1 from information_schema.GLOBAL_STATUS where VARIABLE_NAME = 'Innodb_buffer_pool_read_requests'
--------------
--------------
select @b1 - @a1 AS 'nbre' into @z1
--------------
--------------
create UNIQUE INDEX `idx2` USING BTREE ON `test` (`col2`)
--------------
--------------
select VARIABLE_VALUE into @a2 from information_schema.GLOBAL_STATUS where VARIABLE_NAME = 'Innodb_buffer_pool_read_requests'
--------------
--------------
select col1, col2 from test
--------------
+------+------+
| col1 | col2 |
+------+------+
| 9 | 1 |
| 8 | 2 |
| 7 | 3 |
| 6 | 4 |
| 5 | 5 |
| 4 | 6 |
| 3 | 7 |
| 2 | 8 |
| 1 | 9 |
+------+------+
--------------
select VARIABLE_VALUE into @b2 from information_schema.GLOBAL_STATUS where VARIABLE_NAME = 'Innodb_buffer_pool_read_requests'
--------------
--------------
select @b2 - @a2 AS 'nbre' into @z2
--------------
--------------
ALTER TABLE test ADD dummy VARCHAR(65524)
--------------
--------------
UPDATE `test` SET dummy = REPEAT(uuid(),2000)
--------------
--------------
select VARIABLE_VALUE into @a3 from information_schema.GLOBAL_STATUS where VARIABLE_NAME = 'Innodb_buffer_pool_read_requests'
--------------
--------------
select col1, col2 from test
--------------
+------+------+
| col1 | col2 |
+------+------+
| 9 | 1 |
| 8 | 2 |
| 7 | 3 |
| 6 | 4 |
| 5 | 5 |
| 4 | 6 |
| 3 | 7 |
| 2 | 8 |
| 1 | 9 |
+------+------+
--------------
select VARIABLE_VALUE into @b3 from information_schema.GLOBAL_STATUS where VARIABLE_NAME = 'Innodb_buffer_pool_read_requests'
--------------
--------------
select @b3 - @a3 AS 'nbre' into @z3
--------------
--------------
ALTER TABLE `test` drop index `idx2`
--------------
--------------
select VARIABLE_VALUE into @a4 from information_schema.GLOBAL_STATUS where VARIABLE_NAME = 'Innodb_buffer_pool_read_requests'
--------------
--------------
select col1, col2 from test
--------------
+------+------+
| col1 | col2 |
+------+------+
| 1 | 9 |
| 2 | 8 |
| 3 | 7 |
| 4 | 6 |
| 5 | 5 |
| 6 | 4 |
| 7 | 3 |
| 8 | 2 |
| 9 | 1 |
+------+------+
--------------
select VARIABLE_VALUE into @b4 from information_schema.GLOBAL_STATUS where VARIABLE_NAME = 'Innodb_buffer_pool_read_requests'
--------------
--------------
select @b4 - @a4 AS 'nbre' into @z4
--------------
--------------
select @z1 as 'sans index, sans col',
@z2 as 'avec index, sans col',
@z3 as 'avec index, avec col',
@z4 as 'sans index, avec col'
--------------
+----------------------+----------------------+----------------------+----------------------+
| sans index, sans col | avec index, sans col | avec index, avec col | sans index, avec col |
+----------------------+----------------------+----------------------+----------------------+
| 11 | 11 | 11 | 11 |
+----------------------+----------------------+----------------------+----------------------+
--------------
COMMIT
--------------
--------------
SET AUTOCOMMIT = 1
--------------
Appuyez sur une touche pour continuer... |
Partager