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--- database:database [2010/05/04 16:14] – created decianm
+++ database:database [2012/05/29 20:13] (current) – [How to find the tag corresponding to a dataset] decianm
@@ Line 1: / Line 1: @@
 ====== Databases ======
-===== How to make a snapshop of the online database =====
+===== How to make a snapshot of the online database =====
 On lxplus, do:
@@ Line 13: / Line 13: @@
 </code>
 where yyyy-mm-dd is the date in year-month-day which it should cover.
+===== How to access the database in the options file =====
+Do
+<code python>
+from Configurables import CondDB, CondDBAccessSvc
+CondDB(UseOracle = False)
+connection="sqlite_file:/afs/cern.ch/user/initial/name/mydatabase/myFileName.db/ONLINE"
+CondDB().addLayer(CondDBAccessSvc("DB",ConnectionString=connection))
+</code>
+===== How to use the latest tag =====
+Do
+<code python>
+CondDB().UseLatestTags = ["2011"]
+</code>
+if you want to use the latest tag for 2011 data.
+For **real data** it should always be safe to use the latest tag (this is **not** the case for MC)
+===== How to find the tag corresponding to a dataset =====
+In the bookkeeping-browser: First click on ''Advanced Queries'', then navigate yourself to the production name (for example ''Stripping 17b'') and then right-click to get to ''More Information''. There you should be able to read of the database tags.
+===== Where to find the description of the official tags =====
+Here: http://lhcb-release-area.web.cern.ch/LHCb-release-area/DOC/dbase/conddb/release_notes.html

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