+ # Compact database. This is important if the old schema did not enable
+ # garbage collection (i.e. if it did not have any tables with "isRoot":
+ # true) but the new schema does. In that situation the old database
+ # may contain a transaction that creates a record followed by a
+ # transaction that creates the first use of the record. Replaying that
+ # series of transactions against the new database schema (as "convert"
+ # does) would cause the record to be dropped by the first transaction,
+ # then the second transaction would cause a referential integrity
+ # failure (for a strong reference).
+ $ovsdb_tool -vANY:console:emer compact "$OVSDB_SERVER_DB"
+
+ # Upgrade or downgrade schema.