Davadmin db backup failed: Backend Exception: init/upgrade required

Question

Do somebody knows what the reason for this error is (and how to fix ;-):
root@webmail:~/bin# /opt/comms/davserver/sbin/davadmin db backup -A caldav -u caldav -W <pwfile> -k /backup/davbackup/davdb-`date +%Y%m%d%H%M`.dmp
Backend Exception: init/upgrade required
The mysql.log gives me also no hint:
                   76 Query     SHOW COLLATION
                   76 Query     SET NAMES utf8
                   76 Query     SET character_set_results = NULL
                   76 Query     SET autocommit=1
                   76 Query     SET sql_mode='STRICT_TRANS_TABLES'
                   76 Query     SELECT Database()
                   76 Query     SET autocommit=0
                   76 Query     show tables like "Resource"
76 Query
SELECT * FROM Resources WHERE id = 1 FOR UPDATE
76 Query
rollback
76 Query
rollback
76 Query
SET autocommit=1
root@webmail:~/bin# /opt/comms/CommsInstaller/bin/commpkg info
-- LOGFILE: /tmp/CommsInstaller_20140220095500.log
CommsInstaller version R7u2 (7.2-0.36 [7.0.2.0.0]) built on Fri Sep  9 13:43:49 PDT 2011
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Detecting Installed Products...
  NOTICE: Service Tags is present with a different pkg VERSION.
Detecting Installed Patches...
Use of uninitialized value in concatenation (.) or string at /opt/comms/CommsInstaller/bin/../lib/CI/Chk4patch.pm line 114, <PATCHADD> line 70.
ALTROOT: /
  NAME: ""
  Product: Messaging Server (64bit) 7u4 64bit
           Version: 7.4-27.01
           ALTROOT: /
           Basedir: /opt/comms/messaging64
           Build Date: 20120830
  Product: Comms DSsetup 6.4
           Version: 6.4-25.02
           ALTROOT: /
           Basedir: /opt/comms/dssetup
           Build Date: 20130912
  Product: Calendar Server 7u2
           Version: 7.4-14.03
           ALTROOT: /
           Basedir: /opt/comms/davserver
           Build Date: 20131017
  Product: Convergence 2
           Version: 2.0-6.01
           ALTROOT: /
           Basedir: /opt/comms/iwc
           Build Date: 20130402
  Product: Comms Delegated Administrator 7
           Version: 7.0-4.00
           ALTROOT: /
           Basedir: /opt/comms/da
           Build Date: 20110805

Answer 1

It looks like the Calendar Server is on 7u4-14.03 ( can be cross checked with 'davadmin -V' ), with this Version it is recommended that MySQL backends are upgraded to MySQL5.5.32.
From the reported issue it looks like the upgrade was not done completely.
Reference
https://wikis.oracle.com/display/CommSuite7U5/Upgrading+Calendar+Server