19. The computer network of claim 17 , wherein the operation type is an undo operation and ordering the first portion of database log entries assigned to the particular DDL command object comprises: determining the at least one database command includes a drop table command directed to a table that has a foreign key; and ordering those database log entries from the first portion of database log entries directed to a drop foreign key command before those database log entries from the first portion of database log entries directed to the drop table command.
17. A computer network comprising: one or more computer systems communicatively coupled to the network, each computer system comprising a memory and at least one processor, wherein the one or more computer systems are programmed to collectively perform operations comprising: obtaining a plurality of relevant database log entries, the relevant database log entries being directed to database catalog entities; determining a first portion of the plurality of relevant database log entries are part of a common unit of recovery, the first portion including a plurality of database log entries; assigning the first portion of database log entries to a particular Data Definition Language (DDL) command object based on analysis of attributes of a first entry in the first portion of the database log entries, the particular DDL command object including a timestamp, an action, a target, and data from each of the first portion of database log entries; determining a DDL command object break when an action or a target of a next database log entry in the first portion is inconsistent with the particular DDL command object; storing the particular DDL command object; receiving an indication of an operation type subsequent to the storing, the operation type being an UNDO or a MIGRATE operation type; ordering the entries in the particular DDL command object in an order based on the type of operation, the targets, and the actions; and generating at least one database command based on the operation type, the action, the target, and the data in each of the ordered entries in the particular DDL command object.