写一个查询mysql表空间大小和调整mysql表空间大小的sql语句
时间: 2023-11-02 16:19:30 浏览: 117
}
}
} else {
cout << "用户名或密码错误,请重新输入!" << endl;
}
break;
查询 MySQL 表空间大小的 SQL 语句:
```
SELECT table_schema AS `Database`,
table_name AS `Table`, }
case 2: {
// 顾客
int subChoice;
while (true) {
cout <<
round(((data_length + index_length) / 1024 / 1024), 2) `Size in MB`
FROM "欢迎,顾客!" << endl;
cout << "1. 查看菜单" << endl;
cout << "2 information_schema.TABLES
ORDER BY (data_length + index_length) DESC;
```
调整 MySQL 表空间大小的 SQL 语. 下单" << endl;
cout << "3. 查看订单历史记录" << endl;
cout << "4.句:
1. 增加表空间大小:
```
ALTER TABLE table_name ENGINE=InnoDB ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE 退出登录" << endl;
cout << "请选择: ";
cin >> subChoice;
switch (subChoice) {
=8;
```
其中,table_name 是需要调整表空间大小的表名。
2. 减少表空间大小 case 1: {
string sql = "SELECT * FROM menu";
MYSQL_RES *result = NULL;
MYSQL_ROW row;
:
MySQL 不支持直接减少表空间大小的操作,但可以通过以下步骤实现:
- 备份数据 if (mysql_query(&mysql, sql.c_str())) {
cout << "查询菜单失败: " << mysql_error(&mysql;
- 删除表;
- 重新创建表并导入数据;
- 对表进行优化。
例如:
```
CREATE TABLE new) << endl;
} else {
result = mysql_store_result(&mysql);
if (result) {
cout << "菜_table LIKE old_table;
INSERT INTO new_table SELECT * FROM old_table;
ALTER TABLE new_table ENGINE=InnoDB ROW_FORMAT=COMPRESSED KEY品编号\t菜品名称\t菜品价格\t菜品描述" << endl;
while ((row = mysql_fetch_row(result)))_BLOCK_SIZE=8;
ANALYZE TABLE new_table;
RENAME TABLE old_table TO old_table_backup, new_table TO old_table;
{
cout << row[0] << "\t\t" << row[1] << "\t\t" << row[2] <<DROP TABLE old_table_backup;
```
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