/* 数据导入: Navicat Premium Data Transfer Source Server : localhost Source Server Type : MySQL Source Server Version : 50624 Source Host : localhost Source Database : sqlexam Target Server Type : MySQL Target Server Version : 50624 File Encoding : utf-8 Date: 10/21/2016 06:46:46 AM */...
总结 本文通过对 MySQL 中 DATA_LENGTH 的定义和作用进行了介绍,并解释了 DATA_LENGTH 不变的原因。通过示例代码
### 1.3 查询表大小的SQL命令详解 要查询MySQL数据库表的大小,最常用的方法是通过SQL语句访问`information_schema.TABLES`表。以下是一个标准的查询语句示例: ```sql SELECT table_name AS '表名', table_schema AS '数据库名', engine AS '存储引擎', round(data_len...
Thanks & Regards Sreekanth PM Subject Views Written By Posted Data length for INNODB tables 1980 priya ram February 14, 2018 01:05AM Re: Data length for INNODB tables 809 Peter Brawley February 14, 2018 12:19PM Re: Data length for INNODB tables ...
这是因为 delete 操作并不会真的把数据删除，mysql 实际上只是给删除的数据打了个标记，标记为删除，...
mysql create table 时,有时需要指定 data_type length http://dev.mysql.com/doc/refman/5.5/en/create-table.html 但 类型的长度很多开发并不理解,理解上可以分为两种 1)数字类型: 如int 是 4个byte,32个bit, 对于signed int 它的最大值是 2**32-1=4294967295,带符号显示为 +4294967295 刚好是 11 个...
information_schema.schemata WHERE schema_name NOT IN ( 'information_schema', 'sys', 'mysql'...
参考链接:https://dev.mysql.com/doc/refman/5.6/en/tables-table.html 分析过程: 1、首先,抽查占用空间最大的changeitem.ibd,du显示它占用磁盘11268KB 2、analyze table changeitem之后,查询information_schema.tables,得出2637824 + 589824 + 4194304 = 7,421,952 = 7248KB,与du显示的结果相差4020KB ...
Description: When optimizing a large table, the total_data_length is reduced before the free_data_length in information_schema.tables. The following is an example of what I saw while optimizing one table from a large database. This is before the optimization. mysql> SELECT IFNULL(SUM(DATA_...
Community Relations Manager, North America, MySQL Inc. Got Cluster?http://www.mysql.com/cluster Personal:http://jpipes.com Navigate:Previous Message•Next Message Options:Reply•Quote Subject Views Written By Posted max_data_length trouble with dynamic vs fixed row_format ...