If you were using Nuxeo DM 5.3.2 or later with Oracle and ACL optimizations enabled, you need to update an index before plugging your database to Nuxeo DM 5.4.2.
SELECT index_name FROM USER_INDEXES WHERE table_name LIKE 'READ_ACLS';
Get the index name, result of the previous query, which should look like "SYS_C00XXXX"
Then run the following statement:
ALTER INDEX "SYS_C00XXXX" RENAME TO "ACLR_ACL_ID_IDX";
Now you can start Nuxeo DM 5.4.2 which will rename the table READ_ACLS to ACLR and the previous index will be ready to work with this new configuration.