MySQL 如何避免“repair with keycache”?

为了避免MySQL中的“repair with keycache”，您需要遵循以下语法 −

create table yourNewTableName as (select *from yourOldTableName);
alter table yourNewTableName add index(yourCoumnName);

首先让我们创建一个表 −

mysql> create table DemoTable
   (
   StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   StudentFirstName varchar(20),
   StudentLastName varchar(20)
   );
Query OK, 0 rows affected (0.24 sec)

使用插入命令向表中插入一些记录 −

mysql> insert into DemoTable(StudentFirstName,StudentLastName) values('John','Doe');
Query OK, 1 row affected (0.05 sec)

mysql> insert into DemoTable(StudentFirstName,StudentLastName) values('David','Miller');
Query OK, 1 row affected (0.05 sec)

使用select语句显示表中的所有记录 −

mysql> select *from DemoTable;

这将产生以下输出 −

+-----------+------------------+-----------------+
| StudentId | StudentFirstName | StudentLastName |
+-----------+------------------+-----------------+
| 1         | John             | Doe             |
| 2         | David            | Miller          |
+-----------+------------------+-----------------+
2 rows in set (0.00 sec)

步骤1 − 以下是避免MySQL中“repair with keycache”的查询。

mysql> create table DemoTable as (select *from DemoTable);
Query OK, 2 rows affected (0.34 sec)
Records: 2 Duplicates: 0 Warnings: 0

步骤2 − 现在，使用alter table

mysql> alter table DemoTable add index(StudentFirstName);
Query OK, 2 rows affected (0.57 sec)
Records: 2 Duplicates: 0 Warnings: 0

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