Title: WordPress Database Error
Last modified: August 18, 2016

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# WordPress Database Error

 *  Resolved [jasondunn](https://wordpress.org/support/users/jasondunn/)
 * (@jasondunn)
 * [18 years, 8 months ago](https://wordpress.org/support/topic/wordpress-database-error-11/)
 * I upgraded to 2.3 today, and for the first time, something has gone very wrong.
   My page loads ok, and I can get into the admin tool and even start writing a 
   post. But after maybe 30 seconds, the section below the tag (which I think would
   typically show the last saved time) says this:
 * >  WordPress database error: [Table ‘jason_wordpress.wp_post2cat’ doesn’t exist]
   > 
   > SELECT cat_ID AS ID, MAX(post_modified) AS last_mod FROM `wp_posts` p LEFT 
   > JOIN `wp_post2cat` pc ON p.ID = pc.post_id LEFT JOIN `wp_categories` c ON pc.
   > category_id = c.cat_ID WHERE post_status = ‘publish’ GROUP BY cat_ID
 * If I click SAVE AND CONTINUE EDITING, I get this error:
 * > WordPress database error: [Table ‘jason_wordpress.wp_post2cat’ doesn’t exist]
   > 
   > SELECT cat_ID AS ID, MAX(post_modified) AS last_mod FROM `wp_posts` p LEFT 
   > JOIN `wp_post2cat` pc ON p.ID = pc.post_id LEFT JOIN `wp_categories` c ON pc.
   > category_id = c.cat_ID WHERE post_status = ‘publish’ GROUP BY cat_ID
   > Warning: Cannot modify header information – headers already sent by (output
   > started at /home/jason/public_html/wp-includes/wp-db.php:160) in /home/jason/
   > public_html/wp-includes/pluggable.php on line 390
 * I’m fairly technical, but this is over my head – I know very little about MySQL
   databases. Any suggestions here? I have no idea how to proceed or fix this..

Viewing 7 replies - 1 through 7 (of 7 total)

 *  [Jeremy Clark](https://wordpress.org/support/users/jeremyclark13/)
 * (@jeremyclark13)
 * [18 years, 8 months ago](https://wordpress.org/support/topic/wordpress-database-error-11/#post-627991)
 * Did you do this [step](http://codex.wordpress.org/Upgrading_WordPress_Extended#Step_7:_Delete_the_old_WordPress_files)
   in the upgrade process.
 *  Thread Starter [jasondunn](https://wordpress.org/support/users/jasondunn/)
 * (@jasondunn)
 * [18 years, 8 months ago](https://wordpress.org/support/topic/wordpress-database-error-11/#post-627995)
 * No, I didn’t do the long upgrade, I did the quick upgrade which is the overwrite
   everything. Should I try the upgrade again and see if that helps?
 *  [MichaelH](https://wordpress.org/support/users/michaelh/)
 * (@michaelh)
 * [18 years, 8 months ago](https://wordpress.org/support/topic/wordpress-database-error-11/#post-628000)
 * As jeremyclark13 suggested, I’d consider deleting the WordPress files and reuploading
   as per Steps 7 and 8 in [Upgrading_WordPress_Extended](http://codex.wordpress.org/Upgrading_WordPress_Extended).
 *  Thread Starter [jasondunn](https://wordpress.org/support/users/jasondunn/)
 * (@jasondunn)
 * [18 years, 8 months ago](https://wordpress.org/support/topic/wordpress-database-error-11/#post-628005)
 * Ok, that worked: I deleted everything I was supposed to, re-uploaded everything,
   and now it seems to be working – I’m not seeing the error anymore. I guess from
   now on I’ll do the long-way upgrade. 😉
 *  Thread Starter [jasondunn](https://wordpress.org/support/users/jasondunn/)
 * (@jasondunn)
 * [18 years, 8 months ago](https://wordpress.org/support/topic/wordpress-database-error-11/#post-628007)
 * Ok, not so fast…I’m not seeing errors when doing posts, but I had the Google 
   Sitemaps plugin installed and when I tried to generate a sitemap I saw this error:
 * >  WordPress database error: [Table ‘jason_wordpress.wp_post2cat’ doesn’t exist]
   > 
   > SELECT cat_ID AS ID, MAX(post_modified) AS last_mod FROM `wp_posts` p LEFT 
   > JOIN `wp_post2cat` pc ON p.ID = pc.post_id LEFT JOIN `wp_categories` c ON pc.
   > category_id = c.cat_ID WHERE post_status = ‘publish’ GROUP BY cat_ID
 * That’s a very similar error – what exactly is “post2cat”?
 *  [MichaelH](https://wordpress.org/support/users/michaelh/)
 * (@michaelh)
 * [18 years, 8 months ago](https://wordpress.org/support/topic/wordpress-database-error-11/#post-628011)
 * Yeah disable that plugin and get the new version that is compatible with 2.3.
 *  Thread Starter [jasondunn](https://wordpress.org/support/users/jasondunn/)
 * (@jasondunn)
 * [18 years, 8 months ago](https://wordpress.org/support/topic/wordpress-database-error-11/#post-628020)
 * Ah, ok then – the plugin didn’t indicate that there was a new version on the 
   plugin page, so it never occurred me to me to check. No more error now with the
   new version…

Viewing 7 replies - 1 through 7 (of 7 total)

The topic ‘WordPress Database Error’ is closed to new replies.

## Tags

 * [Database Error](https://wordpress.org/support/topic-tag/database-error/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 7 replies
 * 3 participants
 * Last reply from: [jasondunn](https://wordpress.org/support/users/jasondunn/)
 * Last activity: [18 years, 8 months ago](https://wordpress.org/support/topic/wordpress-database-error-11/#post-628020)
 * Status: resolved

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