Data is produced or processed with different database tags. For example if the VELO was open, the database tag needs to specify that.

Look at your datafiles from the bookkeeping: the file names contain the dataset number. For the following datafile the dataset number is 5630.

DATAFILE='LFN:/lhcb/MC/MC09/DST/00005630/0000/00005630_00000001_1.dst

To look up the tags log in to lxplus (you need a Grid Certificate to do this):

SetupProject Dirac
dirac-bookkeeping-production-informations <datasetNumber>

for example:

dirac-bookkeeping-production-informations 5630

This produces the output:

Production Info: 
    Configuration Name: MC
    Configuration Version: MC09
    Event type: 30000000
Step0:Gauss-v37r5
      Option files: $APPCONFIGOPTS/Gauss/MC09-b450GeV-md100-nu1.py;$APPCONFIGOPTS/Conditions/MC09-20090602-vo-md100.py;$DECFILESROOT/options/30000000.opts;$LBPYTHIAROOT/options/Pythia.opts
      DDDb: MC09-20090602
      ConDDb: sim-20090402-vo-md100
Step1:Boole-v19r7
      Option files: $APPCONFIGOPTS/Boole/MC09-WithTruth.py;$APPCONFIGOPTS/Conditions/MC09-20090602-vo-md100.py
      DDDb: MC09-20090602
      ConDDb: sim-20090402-vo-md100
Step2:Brunel-v35r7
      Option files: $APPCONFIGOPTS/Brunel/MC09-WithTruth.py;$APPCONFIGOPTS/Conditions/MC09-20090602-vo-md100.py;$APPCONFIGOPTS/Brunel/veloOpen.py
      DDDb: MC09-20090602
      ConDDb: sim-20090402-vo-md100
Step3:LHCb-v28r0
      Option files: $STDOPTS/PoolCopy.opts
      DDDb: MC09-20090602
      ConDDb: sim-20090402-vo-md100
Number of Steps   1
Total number of files: 2
         LOG:1
         DST:1
Number of events [('DST', 53453)]
Path:  /MC/MC09/Beam450GeV-VeloOpen-MagDown-Nu1/MC09-Brunelv35-withTruth/None
/MC/MC09/Beam450GeV-VeloOpen-MagDown-Nu1/MC09-Brunelv35-withTruth/None/DST

Under the different steps you find the DDDb tags and the ConDDb tags, i.e. 'DDDb: MC09-20090602', 'ConDDb: sim-20090402-vo-md100' for the example file.

Insert the following lines to your options file:

from Configurables import CondDB
CondDB(UseOracle = True)

DaVinci().CondDBtag = "sim-20090402-vo-md100"
DaVinci().DDDBtag = "MC09-20090602"