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):
|| Table name           || #elements in table  ||  Size after opt.(bytes) ||  Size before 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 =
 *