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  • optimize table

    > optimize table endpoint G;
    *************************** 1. row ***************************
       Table: falcon_global.endpoint
          Op: optimize
    Msg_type: note
    Msg_text: Table does not support optimize, doing recreate + analyze instead
    *************************** 2. row ***************************
       Table: falcon_global.endpoint
          Op: optimize
    Msg_type: status
    Msg_text: OK
    2 rows in set (6.37 sec)
    
    ERROR: 
    No query specified
    
    Thu Aug 27 10:48:08 2020
    
    > alter table endpoint engine='InnoDB'; Query OK, 0 rows affected (6.26 sec) Records: 0 Duplicates: 0 Warnings: 0 Thu Aug 27 10:49:21 2020
    这里mysql给的提示是
    Note>> Table does not support optimize, doing recreate + analyze instead 
    Status>> OK
    也就是说 optimize table 对于innodb来说,无法作为
    a single operation,实际的操作是:
    ALTER TABLE test.foo ENGINE=InnoDB;
    ANALYZE TABLE test.foo;
    

       MySQL5.7已经推荐对于InnoDB的table使用 alter table table_name engine=innodb;语句的方式来进行表碎片优化。


    使用optimize table table.name;

    出现Table does not support optimize, doing recreate + analyze instead
    #########
    Everytime you do optimize MySQL,
    by using mysqlcheck -A -o or using ./mysql_optimize from here. You may see the output Table does not support optimize, doing recreate + analyze instead. It is because the table that you are using is InnoDB. You can optimize the InnoDB tables by using this.
    #########
    1,
    ALTER TABLE table_name ENGINE='InnoDB'; This will create a copy of the original table, and drop the original table, and replace to the original place. Although this is safe, but I suggest you do backup and test first before doing this. 原来如此,大致意思是说innodb的数据库不支持optimize,可以用 ALTER TABLE table.name ENGINE='InnoDB'; 该方法会对旧表以复制的方式新建一个新表,然后删除旧表。虽然这个过程是安全的,但是在进行操作时还是先进行备份为好 还有一种方式: You can make OPTIMIZE TABLE work on other storage engines by starting mysqld with the --skip-new or --safe-mode option. In this case, OPTIMIZE TABLE is just mapped toALTER TABLE.
    2,
    上面是说要求我们在启动的时候指定--skip-new或者--safe-mode选项来支持optimize功能
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  • 原文地址:https://www.cnblogs.com/igoodful/p/13570365.html
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