We have a table with integer fields, it has too large index space. When I copy data to new table the new table significantly less then origin. Data is append mostly, no update.
CREATE TABLE `mobile_app_user_log` (
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`id_soul` int(10) unsigned NOT NULL DEFAULT '0',
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`id_user` int(10) unsigned NOT NULL DEFAULT '0',
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`id_app` int(10) unsigned NOT NULL DEFAULT '0',
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`id_device` int(10) unsigned NOT NULL DEFAULT '0',
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`id_device_model` int(10) unsigned NOT NULL DEFAULT '0',
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`id_version` int(10) unsigned NOT NULL DEFAULT '0',
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`id_code_version` int(10) unsigned NOT NULL DEFAULT '0',
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`id_os` int(10) unsigned NOT NULL DEFAULT '0',
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`date_created` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
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`date_update` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
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PRIMARY KEY (`id_user`,`id_soul`,`id_app`,`id_device`,`id_device_model`,`id_version`,`id_code_version`,`id_os`),
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KEY `id_user` (`id_user`) USING BTREE,
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KEY `date_update` (`date_update`) USING BTREE,
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KEY `date_update_cover` (`id_user`,`date_update`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8
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> create table tmp.ss like api.mobile_app_user_log;
|
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> insert into ss select * from api.mobile_app_user_log;
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Query OK, 9295572 rows affected (5 min 40.75 sec)
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Records: 9295572 Duplicates: 0 Warnings: 0
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> select * from information_schema.tables where table_name in ('mobile_app_user_log', 'ss')\G;
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*************************** 1. row ***************************
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TABLE_CATALOG: def
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TABLE_SCHEMA: api
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TABLE_NAME: mobile_app_user_log
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TABLE_TYPE: BASE TABLE
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ENGINE: InnoDB
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VERSION: 10
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ROW_FORMAT: Compact
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TABLE_ROWS: 8260584
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AVG_ROW_LENGTH: 124
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DATA_LENGTH: 1030750208
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MAX_DATA_LENGTH: 0
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INDEX_LENGTH: 51393871872
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DATA_FREE: 5242880
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AUTO_INCREMENT: NULL
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CREATE_TIME: 2017-12-22 00:04:39
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UPDATE_TIME: NULL
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CHECK_TIME: NULL
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TABLE_COLLATION: utf8_general_ci
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CHECKSUM: NULL
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CREATE_OPTIONS:
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TABLE_COMMENT:
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*************************** 2. row ***************************
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TABLE_CATALOG: def
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TABLE_SCHEMA: tmp
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TABLE_NAME: ss
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TABLE_TYPE: BASE TABLE
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ENGINE: InnoDB
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VERSION: 10
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ROW_FORMAT: Compact
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TABLE_ROWS: 9030468
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AVG_ROW_LENGTH: 64
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DATA_LENGTH: 580911104
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MAX_DATA_LENGTH: 0
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INDEX_LENGTH: 1501560832
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DATA_FREE: 6291456
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AUTO_INCREMENT: NULL
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CREATE_TIME: 2018-04-24 15:44:16
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UPDATE_TIME: NULL
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CHECK_TIME: NULL
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TABLE_COLLATION: utf8_general_ci
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CHECKSUM: NULL
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CREATE_OPTIONS:
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TABLE_COMMENT:
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# ls -l api/mobile_app_user_log.* tmp/ss.*
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-rw-rw---- 1 mysql mysql 8944 Apr 24 2017 api/mobile_app_user_log.frm
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-rw-rw---- 1 mysql mysql 53208940544 Apr 24 15:54 api/mobile_app_user_log.ibd
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-rw-rw---- 1 mysql mysql 2682 Apr 24 15:44 tmp/ss.frm
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-rw-rw---- 1 mysql mysql 2139095040 Apr 24 15:50 tmp/ss.ibd
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How is it possible? Pages fragmentation?
- duplicates
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MDEV-14799
After UPDATE of indexed columns, old values will not be purged from secondary indexes
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Closed
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Another table:
CREATE TABLE `vacsubscriptions_stat` (
`id` int(10) unsigned NOT NULL DEFAULT '0',
`count_vacs` int(10) unsigned NOT NULL DEFAULT '0',
`count_messages` mediumint(8) unsigned NOT NULL DEFAULT '0',
`date_last_message` int(10) unsigned NOT NULL DEFAULT '0',
`count_views` int(10) unsigned NOT NULL DEFAULT '0',
`date_last_view` int(10) unsigned NOT NULL DEFAULT '0',
`count_clicks` mediumint(8) unsigned NOT NULL DEFAULT '0',
`date_last_click` int(10) unsigned NOT NULL DEFAULT '0',
`count_searches` mediumint(8) unsigned NOT NULL DEFAULT '0',
`date_last_search` int(10) unsigned NOT NULL DEFAULT '0',
`date_processed` int(10) unsigned NOT NULL DEFAULT '0',
PRIMARY KEY (`id`),
KEY `date_processed` (`date_processed`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC
> create table tmp.ss like region.vacsubscriptions_stat;
> insert into tmp.ss select * from region.vacsubscriptions_stat;
Query OK, 22522628 rows affected (2 min 18.36 sec)
Records: 22522628 Duplicates: 0 Warnings: 0
In new table index space 10 times lesser:
> select * from information_schema.tables where table_name in ('vacsubscriptions_stat','ss')\G;
*************************** 1. row ***************************
TABLE_CATALOG: def
TABLE_SCHEMA: region
TABLE_NAME: vacsubscriptions_stat
TABLE_TYPE: BASE TABLE
ENGINE: InnoDB
VERSION: 10
ROW_FORMAT: Dynamic
TABLE_ROWS: 21864463
AVG_ROW_LENGTH: 66
DATA_LENGTH: 1451229184
MAX_DATA_LENGTH: 0
INDEX_LENGTH: 4725915648
DATA_FREE: 7340032
AUTO_INCREMENT: NULL
CREATE_TIME: 2018-04-14 22:32:31
UPDATE_TIME: NULL
CHECK_TIME: NULL
TABLE_COLLATION: utf8_general_ci
CHECKSUM: NULL
CREATE_OPTIONS: row_format=DYNAMIC
TABLE_COMMENT:
*************************** 2. row ***************************
TABLE_CATALOG: def
TABLE_SCHEMA: tmp
TABLE_NAME: ss
TABLE_TYPE: BASE TABLE
ENGINE: InnoDB
VERSION: 10
ROW_FORMAT: Dynamic
TABLE_ROWS: 22434550
AVG_ROW_LENGTH: 64
DATA_LENGTH: 1449132032
MAX_DATA_LENGTH: 0
INDEX_LENGTH: 485457920
DATA_FREE: 7340032
AUTO_INCREMENT: NULL
CREATE_TIME: 2018-04-24 16:08:30
UPDATE_TIME: NULL
CHECK_TIME: NULL
TABLE_COLLATION: utf8_general_ci
CHECKSUM: NULL
CREATE_OPTIONS: row_format=DYNAMIC
TABLE_COMMENT: