I am on Civi 4.7.6 / Drupal 7.5

I have not been able to record any new phone numbers for some days (via Webform Integration).

I realize that I have lost a number of log_civicrm_... tables (those alphabetically beyond ..._payment_processor_type), and this can be the reason why.

Thus, I would like to disable logging (via Administer > System Settings >Misc (...) > Logging), but I get this error : "Save failed : DB Error : unknown error".

I assume that this error is due to those missing tables.

How can I get out of that ? (I am not a programmer)


As a matter of fact, I have an other Test Civicrm, where logging is disabled, and when I want to enable it, I get the same error, and there is no enabling.

Anything in relationship with Drupal ?

BTW, I have all privileges on thoses DBs

  • You might want to activate debug and backtrace (civicrm/admin/setting/debug?reset=1) so you could have more information about the error you get.
    – samuelsov
    Commented Sep 19, 2016 at 14:02
  • Does "I have not been able to record any new phone numbers for some days (via Webform Integration)" mean that you can update phone numbers directly on the civicrm record?
    – petednz - fuzion
    Commented Sep 19, 2016 at 21:22
  • @Jacques - please post any updates that aren't answers as comments or by updating your original question, not separate answers please :) You mention a DB error, but that's not much information. In CiviCRM, please go to Administer menu > System Settings > Debugging and Error Handling, select "Yes" to both "Enable Debugging" and "Display Backtrace", and press "Save". Repeat the problem that caused your error, and you'll see much a much more detailed error. Please update this question with the expanded error and backtrace - and don't forget to disable debugging/backtrace when you're done! Commented Sep 21, 2016 at 14:34

3 Answers 3


Fortunately, in CiviCRM 4.7 (and Civi 4.6.17+), installing ANY extension will recreate your missing logging tables. Not that enabling an extension isn't sufficient - you must install an extension. See CRM-15078

The reason this works: If advanced logging is enabled, extensions without a corresponding logging table will generate errors. Because an extension can add a table, there's a function that runs whenever an extension is installed called "fixSchemaDifferences". It checks for any tables without a corresponding logging table and generates it - whether or not that table was added by the extension or not.

  • That's the one I fixed at the sprint last year :)
    – DaveFF
    Commented Sep 20, 2016 at 18:50
  • You should also be able to call the Extension.install API on an extension that is already installed, if you just want to fix the logging tables.
    – DaveFF
    Commented Sep 20, 2016 at 18:52
  • overheard on chat.civicrm.org - the System.flush API has a triggers parameter, so: drush cvapi System.flush triggers=1 Commented Mar 7, 2017 at 0:47

I close this question here : things are a bit more complicated : I report a more extended question here :


Thanks anyway


2019 UPDATE - In case anyone finds this question there is an answer at Civi 5.9 - DB Error: no such table / cannot disable logging

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