Use STOP EXTRACT to stop Extract gracefully. The command preserves the state of synchronization for the next time Extract starts, and it ensures that Manager does not automatically start Extract.
If there are open, long-running transactions when you issue STOP EXTRACT, you might be advised of the oldest transaction log file that will be needed for that transaction when Extract is restarted. You can use the SEND EXTRACT option of SHOWTRANS to view details and data of those transactions and then, if desired, use the SKIPTRANS or FORCETRANS options to skip the transaction or force it to be written as a committed transaction to the trail. See "SEND EXTRACT".