列举了几种查看MySQL运行状况的方法，总结一下。phpMyAdmin最简单的方式，在phpMyAdmin直接点击状态查看，详细如下图。这查看的是MySQL的一些运行状况数值，这种方式被大多数系统管理员所不齿，因为专业的MySQL服务器很少有能通过phpMyAdmin访问的，后面会介绍其他查看方式，但是phpMyAdmin提供优化建议还是很具有指导性和参考性的。SHOW

you can only access elements by their primary key in a hashtable. this is faster than with a tree algorithm ( O(1) instead of log(n)) you cannot select ranges (everything in between x and y). tree alg

mysql索引尽管提高了查询的速度，但是也并不是尽善尽美的，mysql索引也有着自身的不足之处，下面就让我们一起来了解一下。mysql索引的不足之处过多的使用索引将会造成滥用。因此索引也会有它的缺点：◆虽然mysql索引大大提高了查询速度，同时却会降低更新表的速度，如对表进行 INSERT、UPDATE和DELETE。因为更新表时，MySQL不仅要保存数据，还要保存一下索引文件

Joins are used to combine the data from two tables, with the result being a new, temporary table. The temporary table is created based on column(s) that the two tables share, which represent meaningfu

MySQL Hash索引和B-Tree索引的区别究竟在哪里呢？相信很多人都有这样的疑问，下文对两者的区别进行了详细的分析，供您参考。MySQL Hash索引结构的特殊性，其检索效率非常高，索引的检索可以一次定位，不像B-Tree 索引需要从根节点到枝节点，最后才能访问到页节点这样多次的IO访问，所以 Hash 索引的查询效率要远高于 B-Tree 索引。 可 能很多人又有疑问了，既然

LAMP is a combination of operating system and open-source software stack. The acronym LAMP is derived from first letters of Linux, Apache HTTP Server, MySQL database, and PHP/Perl/Python.In this t

MySQL is an open-source relational database. For those unfamiliar with these terms, a database is where an application keeps its data, and relational refers to how the data is organized and accessed w

This tutorial shows you how to use LOAD DATA INFILE statement to import CSV file into MySQL table.The  LOAD DATA INFILE statement allows you to read data from a text file and import the file’s dat

Java MySQL INSERT example: Can you share a Java MySQL INSERT example, specifically using a Java PreparedStatement object?Sure. As the question implies, you can use the Java Statement class to issu

system echo '*** DROP DATABASE iploc ...'DROP DATABASE if exists iploc;system echo '*** CREATE DATABASE iploc ...'CREATE DATABASE iploc;GRANT all on iploc.* to root@'%';USE iploc;

If you reduce the InnoDB page size to 8KB or 4KB by specifying the innodb_page_size option when creating the MySQL instance, the maximum length of the index key is lowered proportionally, based on

1. Export data from MySQL$mysqldump -u root -p -c db_name table_name >table_name.sql

服务启动：    1)#service postgresql start    2)#/etc/init.d/postgresql start    3)#su  postgresql       $ pg_ctl startPostgreSQL的进程号:1210、1207、服务启动：    1)#service mysqld start    2)#/et

MySQL supports several different types of Table Engines also known as "Table Types". A database can have its tables being a mix of different table engine types or all of the same type. Here is more in