Print status/diagnostics while backing up CDM tables (#4407)

 - As per Dan's suggestion

Oracle/backup_cdm.py

@@ -15,36 +15,50 @@ def main(get_cursor):
     cursor, backup_schema = get_cursor()
 
     for table in CDM3_TABLES:
-        if has_rows(cursor, table):
-            drop(cursor, table, backup_schema)
-            copy(cursor, table, table, backup_schema)
-
-
-def drop(cursor, table, backup_schema):
+        bak_schema_table = ('%(backup_schema)s.%(table)s' %
+                            dict(backup_schema=backup_schema,
+                                 table=table))
+        rcount = count_rows(cursor, table)
+        print ('%(table)s (to be backed up) currently has %(rcount)s rows.'
+               % dict(table=table, rcount=rcount))
+
+        if rcount:
+            drop(cursor, bak_schema_table)
+            copy(cursor, table, bak_schema_table)
+            print ('%(bak_schema_table)s now has %(rows)s rows.' %
+                   dict(bak_schema_table=bak_schema_table,
+                        rows=count_rows(cursor, bak_schema_table)))
+
+
+def drop(cursor, schema_table):
+    print ('Dropping %(schema_table)s (%(rows)s rows).' %
+           dict(schema_table=schema_table,
+                rows=count_rows(cursor, schema_table)))
     try:
-        cursor.execute('drop table %(backup_schema)s.%(table)s' %
-                       dict(backup_schema=backup_schema, table=table))
+        cursor.execute('drop table %(schema_table)s' %
+                       dict(schema_table=schema_table))
     except DatabaseError, e:  # noqa
         # Table might not exist
         pass
 
 
-def has_rows(cursor, table):
-    ret = False
+def count_rows(cursor, schema_table):
+    ret = None
     try:
-        cursor.execute('select count(*) from %(table)s' %
-                       dict(table=table))
-        if int(cursor.fetchall()[0][0]) > 0:
-            ret = True
+        cursor.execute('select count(*) from %(schema_table)s' %
+                       dict(schema_table=schema_table))
+        ret = int(cursor.fetchall()[0][0])
     except:
         pass
     return ret
 
 
-def copy(cursor, table, new_name, backup_schema):
-    cursor.execute('create table %(backup_schema)s.%(table)s as '
+def copy(cursor, table, bak_schema_table):
+    print ('Copying %(table)s to %(bak_schema_table)s.' %
+           dict(table=table, bak_schema_table=bak_schema_table))
+    cursor.execute('create table %(bak_schema_table)s as '
                    'select * from %(table)s' %
-                   dict(backup_schema=backup_schema, table=table))
+                   dict(bak_schema_table=bak_schema_table, table=table))
 
 
 class MockCursor(object):