Complete removal of the plugin

@kronos1705 – This process will generally work but we recommend you have a complete fully verified back-up of your site just in case you run into any problems:

Use FTP to remove NextGEN Gallery related folders.
Then use something like https://www.ads-software.com/plugins/wpdbspringclean/ to delete all the ngg tables.
Then use something like https://www.ads-software.com/plugins/database-peek/ to search through the remaining tables for NGG references.
Then use something like https://www.ads-software.com/plugins/edit-any-table/ to delete all of these database entries.

Tables typically involved: wp_ngg_*, wp_options, wp_postmeta, and wp_usermeta

– Cais.

Thanks for the quick response!
How much I understand, ngg can be used as a key in the search phpMyAdmin?
It turned out about 800 mentions. Is not it too much?

@kronos1705 – There is no specific number to expect. Most would be relevant to your site, the number of images, galleries, albums, etc. and how many you used and where…

– Cais.

Got it.
Thanks for the help, everyone did it.

@kronos1705 – Thanks for the update!

– Cais.