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Legal Studies如何在 MySQL 中避免“keycache 修復”命令？
要避免在 MySQL 中使用 keycache 修復，你需要按照以下語法執行 −
create table yourNewTableName as (select *from yourOldTableName); alter table yourNewTableName add index(yourCoumnName);
首先，建立一個表 −
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記錄 −
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 語句顯示錶中的所有記錄 −
mysql> select *from DemoTable;
這將產生以下輸出 −
+-----------+------------------+-----------------+ | StudentId | StudentFirstName | StudentLastName | +-----------+------------------+-----------------+ | 1 | John | Doe | | 2 | David | Miller | +-----------+------------------+-----------------+ 2 rows in set (0.00 sec)
步驟 1 − 以下是避免在 MySQL 中使用“keycache 修復”的查詢。
mysql> create table DemoTable as (select *from DemoTable); Query OK, 2 rows affected (0.34 sec) Records: 2 Duplicates: 0 Warnings: 0
步驟 2 − 現在，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
更新於： 30-Jul-2019
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