| Data partitioning must be very carefully designed to balance I/O and CPU |
| Parallel Loading is great ! --- almost linear speedup |
| Backup may be important to save time (we don't have) |
| The most difficult and trouble-making phase is the database preparation/loading/indexing phase which always involves storage management parameters |
| you must be both a DBA and sysadm and benchmarking relies critically on system stability |
| Be prepared to bring down the whole parallel system a couple of times a day |
| Be prepared that the results are negative (nothing may be obtained !) |
| you need at least twice the disk space of your original database size |
| performance tuning is extremely difficult with Oracle 7 parallel server |