How to move your Wordpress server

[The$Hulk]

First of all make sure you're working on backups (files and BD). If you put your site by modifying original at risk in case of a mistake. Follow the steps mentioned below :

1. Enter your admin panel and disable all plugins.
2. Lower all your system files to disk.
3. Enter phpMyAdmin and optimize the tables in your database (select them all and then click Optimize). Then go to Export and download the *.SQL.
4. Open the *.SQL in an advanced text editor like EditPlus, UltraEdit or Dreamweaver (code view).
   
   1. Do a "Save As" (another name) for you to work on a backup.
   2. Call "Find / Replace" in your editor:
   
   
   Search: http://www.Your-old-site.com
   Replaced by: http://www.Your-new-site.com
   Do it exactly like that. Do not put slashes ("/") at the end or anything else. Just replace the names of the sites.
   Search: / your / old / path / absolute
   Replaced by: / your / new / path / absolute
   This same, no trailing slashes. And of course you know the absolute path of your new site. This database will be ready to be uploaded.
5. Create the new database. When you do be sure to assign the same character encoding than the old. Everything you would now add new data to your existing wp-config.php and you'll have the site running. You may encounter a problem with some directory permissions, as the download / upload the files chmod to reconfigure the default values. If you want to avoid that the client learns how to use SSH to manage files remotely.

[Zeppelin]

Like a glove. I'm about to change the host. Now I make you some questions about what you wrote.

1. Enter your admin panel and disable all plugins.
   Why do I have to turn them off? What happens if you do not turn them off?
2. Enter phpMyAdmin and optimize the tables in your database (select them all and then click Optimize). Then go to Export and download the *.SQL.
   Why do I have to optimize? What if not optimized? What is the use of optimization?

I am hoping that you will provide some solution for my doubts.

[The$Hulk]

@ Zeppelin,

Regarding your questions, disabling plugins cleaned tables in your DB against potential problems (with any plugins) after the move. Moreover, the optimization of the database that it helps to clean the residual load resulting from the use and abuse, so it is important to perform both tasks in that order: first the plugins and then optimization. Everything is a matter of common sense and logic.