我阅读了与优化表相关的文章，需要进一步澄清。
我对MariaDBv10.6.7运行了一个mysqltuner.pl，得到了一些建议，其中一个建议是运行优化表。

Run OPTIMIZE TABLE to defragment tables for better performance
      OPTIMIZE TABLE `DB`.`TableA`; -- can free 426 MB
    Total freed space after theses OPTIMIZE TABLE : 426 Mb

问题：

1.是否可以在InnoDB表中运行OPTIMIZE TABLE 'TableA'以获得更好的性能（据我所知，它会清除磁盘中未使用的空间，但它会有助于提高性能）？
1.因为我使用的是InnoDB，所以它说“表不支持优化，而是进行重新创建+分析”。我需要运行Alter Table ... OPTIMIZE而不是OPTIMIZE TABLE吗（我猜两者都是链接的）？
1.即使我按照建议运行了优化表，我仍然看到表426MB没有被它完全释放（它被减少到384MB）。我们不能释放整个大小吗？

> select * from information_schema.TABLES where TABLE_NAME = "TableA"\G;

***************************1. row***************************

  TABLE_CATALOG: def
   TABLE_SCHEMA: DB
     TABLE_NAME: TableA
     TABLE_TYPE: BASE TABLE
         ENGINE: InnoDB
        VERSION: 10
     ROW_FORMAT: Dynamic
     TABLE_ROWS: 1600474
 AVG_ROW_LENGTH: 207
    DATA_LENGTH: 332136448
MAX_DATA_LENGTH: 0
   INDEX_LENGTH: 0
      DATA_FREE: 446693376 (426MB)
 AUTO_INCREMENT: NULL
    CREATE_TIME: 2022-08-09 16:01:05
    UPDATE_TIME: 2022-08-09 16:04:47
     CHECK_TIME: NULL
TABLE_COLLATION: utf8_general_ci
       CHECKSUM: NULL
 CREATE_OPTIONS: partitioned
  TABLE_COMMENT:
1 row in set (0.01 sec)

ERROR: No query specified

> optimize table TableA;
+-----------+----------+----------+--------------------------------------------------------------------+
| Table     | Op       | Msg_type | Msg_text                                                           |
+-----------+----------+----------+--------------------------------------------------------------------+
| DB.TableA | optimize | note     | Table does not support optimize, doing recreate + analyze instead  |
| DB.TableA | optimize | status   | OK                                                                 |
+-----------+----------+----------+--------------------------------------------------------------------+
2 rows in set (8.25 sec)

127.0.0.1:3307> select * from information_schema.TABLES where TABLE_NAME = "TableA"\G;

***************************1. row***************************

  TABLE_CATALOG: def
   TABLE_SCHEMA: DB
     TABLE_NAME: TableA
     TABLE_TYPE: BASE TABLE
         ENGINE: InnoDB
        VERSION: 10
     ROW_FORMAT: Dynamic
     TABLE_ROWS: 1600474
 AVG_ROW_LENGTH: 193
    DATA_LENGTH: 310116352
MAX_DATA_LENGTH: 0
   INDEX_LENGTH: 0
      DATA_FREE: 402653184 (384MB)
 AUTO_INCREMENT: NULL
    CREATE_TIME: 2022-08-09 16:47:00
    UPDATE_TIME: NULL
     CHECK_TIME: NULL
TABLE_COLLATION: utf8_general_ci
       CHECKSUM: NULL
 CREATE_OPTIONS: partitioned
  TABLE_COMMENT:
1 row in set (0.27 sec)

使用与www.example.com中相同的逻辑mysqltuner.pl来查找可用大小。不确定查询背后的逻辑。

SELECT CONCAT(CONCAT(TABLE_SCHEMA, '.'), TABLE_NAME),cast(DATA_FREE as signed) FROM information_schema.TABLES WHERE TABLE_SCHEMA NOT IN ('information_schema','performance_schema', 'mysql') AND DATA_LENGTH/1024/1024>100 AND cast(DATA_FREE as signed)*100/(DATA_LENGTH+INDEX_LENGTH+cast(DATA_FREE as signed)) > 10 AND NOT ENGINE='MEMORY' $not_innodb

更新1：
根据要求，添加了tableA的输出

> SHOW TABLE STATUS WHERE name LIKE "TableA"\G;

***************************1. row***************************

            Name: TableA
          Engine: InnoDB
         Version: 10
      Row_format: Dynamic
            Rows: 1875385
  Avg_row_length: 3
     Data_length: 5685248
 Max_data_length: 0
    Index_length: 0
       Data_free: 1991245824
  Auto_increment: NULL
     Create_time: 2022-10-25 10:53:40
     Update_time: 2022-10-25 11:34:32
      Check_time: NULL
       Collation: utf8mb3_general_ci
        Checksum: NULL
  Create_options: partitioned
         Comment:
Max_index_length: 0
       Temporary: N
1 row in set (0.002 sec)

> Show create table TableA;

| TableA | CREATE TABLE `TableA` (
  `Col1` mediumint(8) unsigned NOT NULL,
  `Col2` tinyint(4) NOT NULL,
  `Col3` tinyint(4) NOT NULL,
  `Col4` tinyint(4) NOT NULL,
  `Col5` tinyint(4) NOT NULL,
  `Col6` smallint(4) NOT NULL,
  `timestamp` int(11) NOT NULL,
  `Col7` bigint(20) DEFAULT NULL,
  `Col8` bigint(20) DEFAULT NULL,
  `Col9` tinyint(4) DEFAULT NULL,
  :::
  `Col40` tinyint(4) DEFAULT NULL,
  PRIMARY KEY (`Col1` ,`Col2` ,`Col3` ,`Col4` ,`Col5` ,`Col6`,`timestamp`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3
 PARTITION BY RANGE (`timestamp`)
(PARTITION `p2022_10_11_02_00_00` VALUES LESS THAN (1665437400) ENGINE = InnoDB,
 PARTITION `p2022_10_11_03_00_00` VALUES LESS THAN (1665441000) ENGINE = InnoDB,
 PARTITION `p2022_10_11_04_00_00` VALUES LESS THAN (1665444600) ENGINE = InnoDB,
 ....
 PARTITION `p2022_10_25_12_00_00` VALUES LESS THAN (1666683000) ENGINE = InnoDB)
 //partitioned by timestamp. Partitioned more than 360