feature was actually introduced in IDS starting with 10.00.xC4 version but with restrictions and one of the restrictions was it did not work on Enterprise Replication
replicated tables. But starting with Cheetah release this will be supported even on the replicated tables. This feature introduces TRUNCATE TABLE as a supported operation on a replicated table while replication is active, which basically eliminates need for dropping and redefining the replicate and saves time for DBAs. This feature will support TRUNCATE TABLE on local table only, meaning ER will not propagate the TRUNCATE operation to other participants
. The TRUNCATE command needs to be issued on each participant as needed. There are plans to implement the propagation of command in future along with other alter operations(ALTER, RENAME).
One of the key uses of TRUNCATE support which is in conjunction with cdr sync
is, if there is a significant difference between the source and the target, the customer might elect to perform a truncate table followed by a cdr sync command. This would be faster than performing a cdr repair
because the cdr repair must scan the data pages in primary key order while the sync does not. The cdr sync/repair features were introduced in 10.x which basically provided the ability to recognize the differences between tables, between multiple nodes within the replication domain, while ER running and take necessary action as instructed.Vijay Lolabattu