I'm detailing here the optimization performed on the Nebulous and gpc1 databases in march 2011. 

= Nebulous Optimization =
 * Run as ipp on ippdb00 within a screen session
 * Each table was optimized one after the other
   See attached log file: log.nebulous.optimization
 * Size variation (unfortunately I didn't record all the tables):
-------------------------------------------------------------------
|                      | #elements |  Size after  |  Size before |
| Table name           | in table  |  opt.(bytes) |  opt.(bytes) |
------------------------------------------------------------------
| cabinet              |         8 |              |              |
| deleted              |    510597 |              |              |
| directory            |   5264597 |              |              |
| instance             | 439024114 | 156091023360 | 204308742144 | -24%
| lock_record          |         0 |              |              |
| log                  |         0 |              |              |
| mountedvol           |        49 |              |              |
| storage_object       | 390559412 | 165691785216 | 204665257984 | -20%
| storage_object_attr  | 390559412 |              |              |
| storage_object_xattr |  53272583 |              |              |
| volume               |        52 |              |              |
------------------------------------------------------------------

= GPC1 Optimization =
 *