WordPress stores user generated content, along with other configurable information, in a a database (typically MySQL).

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5
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1answer
239 views

Should I use Transients with W3 Total Cache APC Caching? [closed]

Should I use Transients in my queries like this? <?php if ( ! $my_paged = absint( get_query_var( 'paged' ) ) ) $my_paged = 1; if ( ! $my_query = get_transient( "567recent_$my_paged" ) ) { ...
5
votes
1answer
178 views

Performance Gains of Relational DB Setup

Our team is working on the 3rd of large WP sites for a client, and contrary to most "typical" WordPress setups, our projects are generally experience lots of requests, data pulls, and general content ...
5
votes
1answer
134 views

WordPress and multithreading

I'm working on a plugin. I've created an API that reads and writes to a custom table in the DB. This API can be called potentially from N clients simultaneously (and it really happens). I noticed that ...
5
votes
1answer
502 views

WP Multisite: load content from site X on site Y

I'm running a WP multisite-network on my professional website (http://mydomain.com). I'd like to play around with jQuery Mobile and deliver a different website and web experience to mobile users, so I ...
5
votes
1answer
239 views

How can I safely increase the character limit for post passwords?

When I want to protect a post on one of my blogs, I like to use a passphrase instead of a password (albeit purely for the sake of creativity, not security — they're stored plainly anyway). However, ...
5
votes
1answer
1k views

Forcing nickname as display_name in custom edit profile template

Context I've created a front-end "edit profile" template. When I input a value into the nickname text box only the nickname is updated. The default WordPress forum has a select menu that ...
5
votes
1answer
468 views

Slow wp_term_relationships query

I'm running a large WP instance (currently has 28,000+ posts in custom types) and have been experiencing some odd slowdowns. Upon analyzing the MySQL slow query log, one of the problem queries is: ...
4
votes
7answers
4k views

How to move existing Wordpress wp-content folder along with database to new server and new domain name?

Running WP 3.5.1 on a LEMP stack (over at Linode) ... I have a wp-content folder for a WP site along with a full backup of the database. The URL of the site was something like: ...
4
votes
3answers
2k views

Creating two database tables via plugin

I'm working on a voting plugin for my site and I want to create 2 tables: one that stores votes and another that stores voter ips. In Codex it suggests to use an if statement to see if the table has ...
4
votes
2answers
328 views

Is it possible to define two databases for one installation?

Is it possible to define 2 database for one wp installation, I have searched but there are options for one database and 2 installations. I want this because, one of my clients site is hosted on ...
4
votes
5answers
8k views

Site stuck in “Database Update Required” loop

I just updated to 3.1.3 and now when I go to the admin I get the "Database Update Required" /wp-admin/upgrade.php screen. I click 'Upgrade Now' and it says it's done, but then trying to access ...
4
votes
3answers
9k views

insert data in database table from plugin with WP3.1

I am quite new in WP Plugin World. I am trying to develop a plugin in WP 3.1 when I am trying to insert data into my table named "wp_enam" in the following way: $wpdb->insert($wpdb->enam, ...
4
votes
2answers
14k views

How to get the post publish date outside the loop?

I need to pull out the post publish date in order to make the post post auto expire. The thing is I can't get the right publish date. Here is my code: global $wpdb; $post_ids = ...
4
votes
1answer
147 views

what is the wp_5_posts table in the database?

I'm wondering what all the wp_2_*, wp_3_*, wp_4_*, and wp_5_* tables are in the database. Does anyone know what they are? Some of them in my example are from plugins, but what does the wp_# prefix ...
4
votes
2answers
2k views

Get posts by menu ID

I'm a little stuck here. I have a menu in Wordpress with some posts in it. What I would like is to retrieve all the posts as objects. I think I'm pretty close, but the SQL query doesn't seem to work ...
4
votes
6answers
459 views

How can I migrate from another platform to WordPress (using the same domain) and launch when ready?

Currently, I have a blog that runs atop Tumblr, which is relatively young (3 months old or so, maybe 25 posts altogehter) that I want to migrate to a self-hosted Wordpress installation. I've installed ...
4
votes
3answers
285 views

Is it possible to switch the data layer within WordPress?

WordPress is undoubtely very customizable using plugins, but every customization possibility surely has limits defined by the underlying architecture. For those familiar with WP architecture and ...
4
votes
1answer
121 views

Dealing with Many Meta Values, 30+

I have a "Listing" post type with 30+ meta keys which I feel like can cause a strain on the database when there's 100+ posts. Usually what I do is save each meta value 1 by 1 like so: ...
4
votes
3answers
6k views

where is permalink info stored in database?

I see that I can edit permalink information in wp-admin page > settings > permalinks. However, where is that information actually stored in the database?
4
votes
2answers
22k views

Connect to database using wordpress wp-config file

How can I connect to the database using the wp-config.php file ? I'm trying to make a script more Wordpress friendly, and I need to connect to the database, but without installing the script as a ...
4
votes
1answer
262 views

What is the most secure way to store post meta data in WP?

Sony's recent security "holes" showed how unsafe it can be to store data unencrypted. As some of you may know, I 'm working on re-releasing the free CRM theme Driftwood. What is the most secure way ...
4
votes
3answers
857 views

Performance tips for a large user base [closed]

I’m preparing a site with many users (100.000+). Since the output depends on the current user’s relation to some custom post types and taxonomies a static cache won’t help much. Besides using a ...
4
votes
5answers
1k views

How many users can WordPress handle?

I want to design a member login site in WP but I have a doubt that is WordPress can handle more than 40000 users on same database? I am not sure about this so I am stooping my work here. So please ...
4
votes
1answer
190 views

Where can I find the database changes between WordPress versions?

Given vX and vX+1, how do I find the difference between each versions database schema?
4
votes
1answer
811 views

Solution for database version control and deployment?

Currently i use a dump script and commit the database to the git repo. --skip-extended-insert --skip-comments --skip-dump-date means that a diff can give me a fair idea of what has changed, but it ...
4
votes
1answer
368 views

Writing a plugin that notify my friends of new post that mentions(@) them

For example, I write a new post with content "Today I'm happy, because I finally met the girl that @David told me about bla blah..." Once the post is published, there should be an email notification ...
4
votes
2answers
457 views

What is the advantage of the wp_options design pattern?

As we all know, a design pattern that is used frequently in Wordpress' DB code is the idea of persisting data for a particular object (blog/post/comment), indexed with a particular name or key. We ...
4
votes
2answers
122 views

Presentation vs Content in WP DB-Tables

Presentation vs Content in WP DB-Tables Is there a clean separation between the WP tables involved with presentation vs content? I would like to take my time working up presentation changes, such ...
4
votes
3answers
880 views

How might I retrieve a featured post image from an external WP site and display it as a link back?

I have two WP sites. I want to reach from one of them, into the other, and retrieve specific featured images for posts, and display them with a link to that post. I am using this line (with the ...
4
votes
1answer
397 views

find a random blogid across my multisite network that has at least one post published

I need to find a random blog across my multisite network that has at least one post published of a certain post_type, and return its blogid as a variable so I can use it in a switch_to_blog() call. I ...
4
votes
2answers
2k views

Special characters in WordPress UTF-8 [closed]

I have a problem regarding special characters that are appearing messed up on the front-end . mainly the get converted to question marks, or something like �?) Example - Frédèric becomes Fr�d�ric. ...
4
votes
3answers
2k views

Moving Wordpress to new server: no posts found

I have a weird problem with moving a Wordpress installation to a new server (just the server changes, domain remains the same, I'm currently accessing the site on the new server via the same domain ...
4
votes
0answers
44 views

Relaunch 4.2 utf8mb4 databse upgrade

I updated WP to 4.2 while it was on an old server, that doesn't match the utf8mb4 upgrade requirements. I moved to another server that fit these requirements, but WP won't launch this database ...
4
votes
2answers
433 views

Using Vagrant for customizable Wordpress Multi-sites [closed]

Background: My partner and I have a goal to create a customizable vagrant project that uses Wordpress multi site, as a local development environment. Ideal Use Case: Various developers on our team ...
4
votes
0answers
393 views

WordPress database error: [Query was empty] [closed]

I'm using $wpdb to connect to a different database than my WordPress one like this: $newdb = new wpdb(DB_NEW_USER, DB_NEW_PASSWORD, DB_NEW_NAME, DB_NEW_HOST); I need to insert multiple rows into ...
3
votes
1answer
1k views

Default Wordpress settings API data sanitization

It looks to me that when saving data to the database via the settings API Wordpress sanitizes data by default. By that I mean that if I look at the raw settings options in the database they have (at ...
3
votes
3answers
3k views

How To Export/Import WordPress (MySQL) Database Properly Via Command-Line?

Normally, a MySQL database can be exported and imported using these simple SSH commands: Export: mysqldump -u USERNAME -p DATABASE_NAME > filename.sql Import: mysql -u USERNAME -p ...
3
votes
2answers
1k views

Migrating data between local and development server

I've been working away at a medium-size WordPress site. So far I've just been hosting the site on my local machine and showing it to internal consultants over our local network. Things are working ...
3
votes
2answers
3k views

Transient RSS feeds in wp_options not removed automatically?

I just noticed 55.000 entries(!) in my wp_options table. I had not been there for a while. So I ran: delete from `wp_options` where `option_name` like '_transient_timeout_rss%' delete from ...
3
votes
1answer
534 views

$wpdb->prepare() warning in WordPress 3.5

I am receiving this warning when I try to run a database query: Warning: Missing argument 2 for wpdb::prepare() The offending query is: $result = $wpdb->get_var( $wpdb->prepare( ...
3
votes
2answers
1k views

Display data from a non wordpress database on a page template

I am using a sql query to access information to display on a wordpress page by adding the below code to a page template. I know the query works as I've tested it in phpmyadmin. $rows = ...
3
votes
5answers
10k views

Will it break my site if I delete all transient records in wp_options table?

My site currently has an outrageous 500k+ transient records in the wp_options table. This causes the table to be crashed frequently and so be my site. I thought transient records will all expired ...
3
votes
2answers
4k views

How to delete outdated, wrongly sized images in _wp_attachment_metadata?

I've got several custom image sizes for my blog. One of these is setup as add_image_size( 'slide', 640, 290, true );. These are used in a header slideshow. My problem is I've upped the dimensions of ...
3
votes
2answers
1k views

Is it a bad practice to go directly to the mysql database while developing a plugin?

This is a sample of the Vote it Up plugin: //Run this to create an entry for a post in the voting system. Will check if the post exists. If it doesn't, it will create an entry. function ...
3
votes
2answers
3k views

Displaying content from one WP site on separate WP site

I have two totally separate WP websites setup. Different domains, different databases. I manage both of them and they are both hosted on a dedicated server. I am trying to include some basic ...
3
votes
1answer
4k views

how do I determine which image is the featured image in the database

I've queried all children of the post, and two records are shown. This is ok because there are 2 images in the gallery, but I can see no field in the database which makes it clear which one is the ...
3
votes
2answers
196 views

WordPress for a very large website

I've searched and searched but I did not find an answer online. Also, I've posted this on StackOverflow and apparently it wasn't ok and I reposted this here. I hope it's ok. I have this website which ...
3
votes
1answer
2k views

wp_users user_status field

I have found an answer to my question here but it's 7 years old. I simply want to know if I can use this column for my own purposes. I'm planning to use the user_activation_key column to store a ...
3
votes
1answer
505 views

Formatting of curly brackets array from WP database to get more readable output

E.g. when I want to edit something in my WP database, I get a headache, literally. Because I see something like this: ...
3
votes
2answers
309 views

Plugin development with unit tests

One of the things that my plugin does is creates a number of SQL tables as part of a versioning function (that is run under the admin_init hook as I couldn't find a better wordpress way of doing ...