Sometimes in XIB the size of Queue directory increases abnormally.

When the $CORE_DATA/queue directory  increases abnormally., that probably indicates that there are old unused queues available.

The procedure to clean the queues is as follows:
1. Stop XIB (core_servers stop)
2. backup the directory under $CORE_DATA/queue (at my system the directory is called 197)
3. go to $CORE_DATA/queue
4. run the command queuemk <number of the directory that you backed up in step 2>
  On my system it would be :
  cd $CORE_DATA/queue
  queuemk 197
5. Start XIB again (core_servers start)
6. Start the XIB tasks. When the queue server is started, verify the directory $CORE_DATA/queue again, and see that the necessary queues are recreated.
7. If the queues are correctly recreated, you can delete the old backup directory of step 2.