Table Rebuild is a utility that repairs data corruption. It does so by rebuilding tables on a specific AMP vproc based on data located on the other AMP vprocs in the fallback cluster.
Table Rebuild can rebuild data in the following subsets:
- The primary or fallback portion of a table
- An entire table (both primary and fallback portions)
- All tables in a database
- All tables that reside on an AMP vproc
Table Rebuild performs differently based on the type of table (for example, fallback or not).
| Type of Table | Action |
|---|---|
| Fallback Tables | Delete the table header (one row table which defines a user data table) Delete specified portion of the table being rebuilt Rebuild the table header Rebuild the specified portion of the table |
| Non-fallback Tables | Delete the table header. Rebuild the table header. |
| Permanent Journal Tables | Delete data for the table being rebuilt. Rebuild the table header. Locks the table pending rebuild. You must restore non-fallback data.
|
You can start REBUILD when the failed AMP has been fixed and brought back to the OFFLINE state.