Title: database error.
Last modified: February 9, 2022

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# database error.

 *  Resolved [Lalit Jindal](https://wordpress.org/support/users/lalitjindal/)
 * (@lalitjindal)
 * [4 years, 3 months ago](https://wordpress.org/support/topic/database-error-359/)
 * Hi Guys.
 * Do you guys know what this error is about in the log?
 * Thank you
 * //`WordPress-Datenbank-Fehler Deadlock found when trying to get lock; try restarting
   transaction für Abfrage DELETE FROM`wp_options`WHERE`option_name`= 'wphb_cache_preload_batch_dd77cc194f9fa63da8b99e334bb7116a'
   von do_action('wp_ajax_nopriv_wphb_cache_preload'), WP_Hook->do_action, WP_Hook-
   >apply_filters, Hummingbird\Core\Modules\Caching\Background_Process->maybe_handle,
   Hummingbird\Core\Modules\Caching\Background_Process->handle, Hummingbird\Core\
   Modules\Caching\Background_Process->delete, delete_site_option, delete_network_option,
   delete_option`
 * //

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Plugin Support [Dimitris – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support6/)
 * (@wpmudev-support6)
 * [4 years, 3 months ago](https://wordpress.org/support/topic/database-error-359/#post-15347759)
 * Hello there [@lalitjindal](https://wordpress.org/support/users/lalitjindal/)
 * It seems like related to the **Preload caching** options in Hummingbird Page 
   Caching.
 * Could you please deactivate any preloading options and check again?
 * Also, if using these pre-loading options, please do keep the **Clear full cache
   when post/page is updated** option disabled.
 * Looking forward to your results.
 * Thank you,
    Dimitris
 *  Thread Starter [Lalit Jindal](https://wordpress.org/support/users/lalitjindal/)
 * (@lalitjindal)
 * [4 years, 3 months ago](https://wordpress.org/support/topic/database-error-359/#post-15350609)
 * Thanks Dimitris
 * “Clear full cache when post/page is updated” was already disabled.
 * I’ve disabled preloading. This seems to solve a couple of problems I was having.
 * I guess preloading only affects the load time of the first visit to the page 
   not subsequent users? I’ll keep it off.
 * I have another question about Asset optimization:
 * Should the preload asset option be used on CSS that has been moved to the footer?
   [https://i.imgur.com/oVtn0oq.png](https://i.imgur.com/oVtn0oq.png)
 * And should it be used for JS that has been moved to the footer or loaded after
   the page load? what about when an asset is combined? [https://i.imgur.com/wibSmsa.png](https://i.imgur.com/wibSmsa.png)
 * In other words, when is it appropriate to use asset preload and when should it
   be completely avoided?
 * Thank you so much
 *  Plugin Support [Patrick – WPMU DEV Support](https://wordpress.org/support/users/wpmudevsupport12/)
 * (@wpmudevsupport12)
 * [4 years, 3 months ago](https://wordpress.org/support/topic/database-error-359/#post-15352572)
 * Hi [@lalitjindal](https://wordpress.org/support/users/lalitjindal/)
 * > I guess preloading only affects the load time of the first visit to the page
   > not subsequent users? I’ll keep it off.
 * The preload will cache the page when the cache is flushed but in some cases can
   cause high server usage based on how many time the pages get flushed, however,
   it is fine to keep disabled.
 * > Should the preload asset option be used on CSS that has been moved to the footer?
   > [https://i.imgur.com/oVtn0oq.png](https://i.imgur.com/oVtn0oq.png)
 * No, you only preload important files for example Theme CSS file.
 * > And should it be used for JS that has been moved to the footer or loaded after
   > the page load? what about when an asset is combined? [https://i.imgur.com/wibSmsa.png](https://i.imgur.com/wibSmsa.png)
 * Yes, you can use the combine and load after page, same as moving to the footer.
 * > In other words, when is it appropriate to use asset preload and when should
   > it be completely avoided?
 * We have a great guide for Assets Optimization at: [https://wpmudev.com/docs/wpmu-dev-plugins/hummingbird/#asset-optimization](https://wpmudev.com/docs/wpmu-dev-plugins/hummingbird/#asset-optimization)
 * Best Regards
    Patrick Freitas
 *  Thread Starter [Lalit Jindal](https://wordpress.org/support/users/lalitjindal/)
 * (@lalitjindal)
 * [4 years, 3 months ago](https://wordpress.org/support/topic/database-error-359/#post-15352584)
 * Yeah, I’ve already gone through the doc. Thank youy

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘database error.’ is closed to new replies.

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 * 4 replies
 * 3 participants
 * Last reply from: [Lalit Jindal](https://wordpress.org/support/users/lalitjindal/)
 * Last activity: [4 years, 3 months ago](https://wordpress.org/support/topic/database-error-359/#post-15352584)
 * Status: resolved