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=== Preview generation:

* in config.php

  enable_previews -> true / false
  preview providers -> check for certain type

* storage location:

  data/appdata_instanceid/preview

* previewgenerator app

  generates previews to preview storage location
  using config settings
  occ preview:cleanup
  occ preview:pre-generate -> only new files!
  occ preview:generate-all -vvv --workers=n username
  files:scan-app-data

== Metadata storage:

* pre-v33:

  oc_filecache table

* from v33:

  oc_previews table

=== Fix:

# config.php : 'enable_previews' ⇒ false, # occ preview:cleanup # DELETE FROM oc_filecache WHERE path LIKE 'appdata_<instanceid>/preview/%'; # occ files:scan-app-data # config.php : 'enable_previews' ⇒ false,

=== Regenerate previews if lost or broken:

# disable ALL nc cron jobs # run fix # log in with nc user: e.g. w_nc (don't sudo, not working) # nc_directory # php occ preview:generate-all -vvv –workers=n username # re-activate cron-jobs