Block-level compression is fault-tolerant:
- If an AMP is down, the Ferret COMPRESS and UNCOMPRESS commands can still operate.
- If a database restart occurs when a table is being compressed or uncompressed, the interrupted operation completes during system recovery.
To see the compression or uncompression operations in progress during a system recovery after a database restart, use the Ferret command SHOWAMPRECOVERYBLC. You can also use that command to cancel the operations you just viewed if you want to minimize transaction recovery time after a restart.