This information supplements the Adaptive Server 15.7 SP100 documentation for Incremental Reorganization and describes how concurrent DDLs behave when reorg defrag is in progress and how reorg defrag behaves during concurrent DDLs.
When reorg defrag is in progress on a table, invocation of any schema changing utility or data reorganization utility fails with error 11051. In rare cases of race condition between reorg defrag and the other utility, one of them might have to wait for the other to complete.
When reorg defrag utility is in progress on a table, another invocation of reorg defrag on the same table will fail with error 8233.
When a schema changing utility or data reorganization utility is in progress, invocation of reorg defrag would wait for the utility to complete before proceeding to defragment the data.