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                            # 刪除索引
當索引過多時，維護開銷會增大，您可以根據需要刪除不必要的索引。

MySQL 模式下，刪除索引的語法格式如下：

~~~
ALTER TABLE table_name DROP key|index index_name ;
~~~

或者

~~~
DROP INDEX index_name ON table_name;
~~~

刪除表的索引的示例如下：

~~~
obclient> ALTER TABLE t3 DROP KEY t3_uk, DROP KEY t3_ind3;
Query OK, 0 rows affected (0.07 sec)
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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