Database Error: rank_math_notifications

I just wanted to add that I already tried everything you mentioned here:

https://www.ads-software.com/support/topic/database-error-308/

I do use WP_Rocket as caching plugin and Cloudflare as CDN.

Memory doesn’t getting exhausted.

Hello @cherti

Thank you for contacting the support and sorry for any inconvenience that might have been caused due to that.

Upon researching further online, we found that few other users have reported such issues with WPML, Shield, etc. plugins.

The most common reasons for this error are
1. Cache plugin – You can check if the error is logged again by clearing/disabling the cache plugin and also on the server-side.

2. Memory getting exhausted – If the log file is showing memory-related errors then this could be the reason

3. A theme or a plugin is running a query and not completing it – You can check if another plugin is not causing this problem by creating a staging site with only Rank Math plugin activated.

Following are the links of the issues where other users have reported this error:
https://www.ads-software.com/support/topic/wordpress-database-error-commands-out-of-sync/
https://premium.wpmudev.org/forums/topic/branda-wordpress-database-error-commands-out-of-sync-you-cant-run-this-command-now-for-qu/
https://wpml.org/forums/topic/database-error-commands-out-of-sync/

Hope that helps. Thank you.