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Legal Studies如何在 MySQL 中避免“keycache 修复”命令？
要避免在 MySQL 中使用 keycache 修复，你需要按照以下语法执行 −
create table yourNewTableName as (select *from yourOldTableName); alter table yourNewTableName add index(yourCoumnName);
首先，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 insert 命令在表中插入一些记录 −
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 − 以下是避免在 MySQL 中使用“keycache 修复”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
更新于： 30-Jul-2019
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