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0001 # Overview of CondCore/CondHDF5ESSource
0002
0003 ## CondHDF5ESSource
0004
0005 CondHDF5ESSource is an EventSetup source that can read conditions data from an HDF5 file. The full configuration options for the module can be obtained by doing the standard
0006
0007 ```
0008 > edmPluginHelp -p CondHDF5ESSource
0009 ```
0010
0011 In general, one will specify the file to read and the global tag stored within that file to use. E.g.
0012
0013 ```python
0014
0015 globalTag = cms.ESSource("CondHDF5ESSource", filename = cms.string("JobConditions.h5cond"), globalTag = cms.string("SomeTag") )
0016 ```
0017
0018 ## Utilities for creating an HDF5 conditions file
0019
0020 ### conddb2hdf5.py
0021
0022 This utility reads from the conditions database and writes a specified global tag into to the file. The full range of options can be seen by doing
0023
0024 ```
0025 > conddb2hdf5.py --help
0026 ```
0027
0028 The simplest way to use the utlity is to specify a global tag and the output file name
0029
0030 ```
0031 > conddb2hdf5.py SomeTag --output JobConditions.h5cond
0032 ```
0033
0034 NOTE: it can take many hours to dump all the conditions from a global tag stored in the DB.
0035
0036 ### condhdf5tohdf5.py
0037
0038 This utility reads from one hdf5 conditions file and writes a specified global tag into a new hdf5 file. The full range of options can be seen by doing
0039
0040 ```
0041 > condhdf5tohdf5.py --help
0042 ```
0043
0044 The simplest way to use the utlity is to specify the input file, a global tag and the output file name
0045
0046 ```
0047 > condhdf5tohdf5.py OriginaFile.h5cond SomeTag --output JobConditions.h5cond
0048 ```
0049
