Fixed #4140: Documented the ORA-06552 error that can occur when a key…

…word is used as a field name in the Oracle notes.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12346 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/ref/databases.txt

@@ -608,6 +608,14 @@ Oracle imposes a name length limit of 30 characters. To accommodate this, the
 backend truncates database identifiers to fit, replacing the final four
 characters of the truncated name with a repeatable MD5 hash value.
 
+When running syncdb, an ``ORA-06552`` error may be encountered if
+certain Oracle keywords are used as the name of a model field or the
+value of a ``db_column`` option.  Django quotes all identifiers used
+in queries to prevent most such problems, but this error can still
+occur when an Oracle datatype is used as a column name.  In
+particular, take care to avoid using the names ``date``,
+``timestamp``, ``number`` or ``float`` as a field name.
+
 NULL and empty strings
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