Reduce WordPress CPU Usage #2: Uninstalling a WordPress plug-in completely
Today, we are going to talk about how to clean up WordPress plug-in left overs / uninstall a WordPress plug-in completely.
Do you know that deactivating and removing a plug-in doesn’t necessarily mean removing its table entries on WordPress database? These tables and also record entries are cluttering your WordPress database and I’m sure it has an effect to your WordPress blog, even if not much.
I’m using a plug-in called “Clean Options” and a few manual ways to clean these up. So if you have installed/uninstalled a plug-in in the past (which I’m sure you have!), then check this post out.
WordPress Plug-in leftovers
With the help of a plug-in in which I will explain in more details later, I found out that there were table entries related to these past plug-ins that I used:
- Gravatar plug-in
- All in one SEO pack
- alinks
- Defensio
- Download Monitor
- Social Dropdown
- Featurific
- Genki Announcement
- Global Language Translator
- Mighty Search
- My Dashboard
- PostRatings
- Social Bookmark Plugin
- SEO Friendly Images
- Sociable
- Social List
- WP-SpamFree
- SezWho Comment
- TanTan
- Admin Management Extended
- Easy Uploader
- Enhanced WordPress Contact Form
- One click updater
Crazy, eh? So here is how you can find out which plug-in leftovers are lingering in your WordPress’ database.
How to Uninstall WordPress plug-in completely
- Install a plug-in called Clean Options. The plug-in will look for truncated/orphaned entries on the wp_options table.
- Follow the instructions to identify options that are no longer being used by your blog (the plug-in detects this by analyzing whether there is any plug-in linking to the options).
- On the last step, you will be presented with the list of all orphaned options. Look at it one by one carefully and make sure that you really don’t need them anymore. Tick the ones that you want to remove.
- After running the Clean Options plug-in, the entry on the wp_options table was down from about 1200 entries to 523 entries (meaning, there were about 700 unused entries/left over from uninstalled plug-ins!!)
- Now, use your PHPMyAdmin application on your cPanel (or other application) to analyze your WordPress database (usually named _wrdp1 but it can be different on yours).
- Read through all the table names and find out tables that sounded like your old plug-ins or old themes that you no longer use. Tick and drop the tables (remove them)! If you are not sure, then don’t remove them. It’s better to leave unused entries there than removing a used entry accidentally!
In the screenshot above, I can see tables left behind by alinks and SezWho commenting plug-ins. There were others but it won’t fit on the screenshot
These tables and unused entries can clutter your database. Since reinstalling a plug-in will install these tables back, it is safe to remove them (even if you are planning to use the plug-ins again one day). I’m not sure though whether removing these entries have any impact on the CPU usage but it’ll definitely have a bit of performance impact when your blog needs to grab these information from the options table.
Also, it will reduce the time and space needed when you are backing up your blog since you no longer need to backup these unused entries.
Check out my entire reducing WordPress CPU Usage series on my blogging guide series page.
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Hi,
Thanks for the tip.
I will see all the rest of yours posts.
Best regards,
Felipe
Felipe´s last blog post..Grandes Jardins em pequenos espaços
Hey Michael I told I will be watching your further blog posts for reducing your server load and optimizing your DB.
I’m still unsure if I should use this right now or now, though its referred by you, I’m giving it a try now
About that jqery prompt in the last blog post I talked about, that is beause when I change my post for comment love.. Though it should not happen.. So Either cross check at the support forum or ask the developer..
Harsh Agrawal´s last blog post..Microsoft Decision based search engine : Bing.com
Thanks, Harsh. I’ll keep my eyes and ears open
I have got to go and give this a try. The de-activated plugins do leave a lot of things behind. At present my database has all sorts of muck laying around. Thanks for sharing this.
Lyndi´s last blog post..Weekend Round-Up – 29 May 2009
Maybe this issue will be taken care of the later WordPress in the future. Let’s hope so
Wow, there are so many plugins that you’ve installed!
Steve Yu´s last blog post..Portable Freeraser Securely Deletes Sensitive Data On the Go
Whoops
Hi Michael,
thanks for the detailed post.
I have seen some plugin developers incorporating an uninstall feature, but not all do. I usually log onto my DB and remove it from there, I am confident enough to do it without making huge problems. I do always backup just to make sure.
It would be nice if WP incorporated this as having another plugin installed to remove entries is a bit of a drag for me. From Harsh’s one post about how many plugins should one have, I am trying to keep my installed plugins to a minimum.
George Serradinho´s last blog post..Transform your pictures with PhotoFunia
So I guess we can all blame the lazy plug-in developers! This is pretty similar with PocketPC applications leaving memory leaks or bad footprints
Nice Information! Never knew you had plugins to clean left overs from other plugins
Will try this plugin as I have used a lot of plugins on a trial and error basis, so i guess there’ll be a lot of leftovers
Cheers
Sandeep
Great piece of information. I didn’t know about the left over of the plugins. Well i will give it a try to see how many extra entries are there.
Hi Michael, thanks for the tips. Suddenly, our web client got a problem because one of plugin not work. I try to uninstalled, but it doesnt work either. I hope with this tips, my problem will be gone
.
Did you remove the plug-in files completely from the wp-contents/plugins? It should be disabled automatically when you do
great tips man
Thank you for this post, I didn’t know that sz_*** tables are generated by sezwho which I tested before. I deleted them already.
Glitch´s last blog ..My Entrecard Image Was Plagiarized
Same here, they didn’t stay long on this blog