n is either 1 (true) or 0 (false). The default value is 0.
Every TCOMMIT command requests a flush of the journal data involved in that transaction to disk. SynchCommit controls what happens at that point. When enabled (n = 1), TCOMMIT completes after the journal data write operation completes. If SynchCommit is not enabled, TCOMMIT completes without waiting for the write operation.
Changing This Parameter
On the Compatibility page of the Management Portal (System Administration > Configuration > Additional Settings > Compatibility), in the SynchCommit row, click Edit. Select SynchCommit to enable this setting.
To change this parameter for a single process only (as opposed to instance-wide), use the SynchCommit()Opens in a new tab method of the %SYSTEM.ProcessOpens in a new tab class. See the class reference for details.