方法一:show语句 常用show命令 SHOW DATABASES; #查看所有数据库SHOW TABLES; #查看当前库的所有表SHOW TABLES FROM 库名 #查看某个指定库下的表SHOW CREATE DATABASE 库名 #查看建库语句SHOW CREATE TABLE 库名.表名 #查看建表语句SHOW GRANTS FOR root@'localhost' #查看
数据字典(Data Dictionary)中存储了诸多数据库的元数据信息,包括基本Database, table, index, column, function, trigger, procedure,privilege等;以及与存储引擎相关的元数据,如InnoDB的tablespace, table_id, index_id等。MySQL8.0在数据字典上进行了诸多优化,下面会针对MySQL 8.0的数据字典做相关优化做详细的介绍。
create database mysqlsimpledatabase; 创建数据库 第4 步:借助 USE 语句,现在让我们使用新创建的示例数据库。为此,请使用以下语法; use mysqlsimpledatabase; 使用数据库 第5 步:更改数据库后,我们现在将继续下一步,即将我们的“mysqlsampledatabase”导入我们的 MySQL 服务器。使用以下语法导入数据库; Source /...
data_free, engine FROM information_schema.tables WHERE table_schema NOT IN ('information_schema', 'mysql') AND data_free > 0 ORDER BY DATA_FREE DESC; 查看某个表的碎片大小 SHOW TABLE STATUS LIKE '表名'; 查询结果中的'Data_free'字段的值就是碎片大小。 七. 清理表碎片 1 2 3 4 ...
The name of the schema (database) to which the view belongs. TABLE_NAME The name of the view. VIEW_DEFINITION TheSELECTstatement that provides the definition of the view. This column has most of what you see in theCreate Tablecolumn thatSHOW CREATE VIEWproduces. Skip the words beforeSELECT...
TABLE_SCHEMA The name of the schema (database) to which the view belongs. TABLE_NAME The name of the view. VIEW_DEFINITION The SELECT statement that provides the definition of the view. This column has most of what you see in the Create Table column that SHOW CREATE VIEW produces...
| database() | +---+ | INVOICE | +---+ 1 row in set (0.00 sec) mysql> 3:查看数据库使用端口 mysql> show variables like 'port'; +---+---+ | Variable_name | Value | +---+---+ | port | 3306 | +---+---+ 1
owners.Type'help;'or'\h'forhelp.Type'\c'to clear the current input statement.mysql>mysql>show databases;+---+|Database|+---+|db_test||information_schema||mysql||performance_schema||sys|+---+5rowsinset(0.01sec)mysql> 系统库的历史 2005年10月MySQL 5.0发布,MySQL 5.0是MySQL数据库管理系统...
Database changed mysql> show tables; +---+ | Tables_in_zhaojd | +---+ | t_group | | t_product | | t_student | | v_product | | view_test1 | | view_test2 | | view_test3 | | view_test4 | | view_test5 | | view_test...
MySQL.Database(server as text, database as text, optional options as nullable record) as table About Returns a table of SQL tables, views, and stored scalar functions available in a MySQL database on server server in the database instance named database. The port may be optionally specifie...