At an emergency restart, autoinstalled TCT entries are recovered unless you specify a restart delay period of zero in the AIRDELAY system initialization parameter. This means that users can log on again after an emergency restart without going through the autoinstall process. Those terminals with AUTOCONNECT(YES) specified in their TYPETERM definition are automatically logged on during the restart process, without the need for operator intervention. The recovery of autoinstalled TCT entries avoids the performance impact of many concurrent autoinstall requests following a CICS® restart. A terminal user logging on after restart uses the TCT entry created for that terminal's NETNAME during the previous CICS run. It is just as if that terminal had an individual TERMINAL definition installed in the TCT.
Because this could pose a threat to security, CICS checks for operator activity after recovery. After a delay, all autoinstalled TCT entries that were recovered but are not in session again are deleted. As well as improving security, this ensures that CICS storage is not wasted by unused TCT entries. You can specify the length of the delay using the system initialization parameters.
If persistent sessions is in use and AIRDELAY is not equal to zero, autoinstalled TCT entries are treated exactly like other TCT entries. See the CICS Recovery and Restart Guide for more information about persistent sessions.
If XRF is in use, autoinstalled TCT entries are treated exactly like other TCT entries. That is, any TCT entry installed in the active CICS can be tracked, and a corresponding TCT entry is then installed in the alternate CICS. At an XRF takeover, for a terminal that is tracked, a TCT entry is already present in the new active CICS and the terminal is logged on. Therefore, the user does not have to go through the autoinstall process again.
At a warm start, TCT entries that were previously autoinstalled are lost, unless you logoff and CICS is shut down before the AILDELAY time has expired.
If a TCTTE is recovered during emergency restart, a specification of AUTOCONNECT(YES) prevents deletion of the TCTTE by AIRDELAY. If you want the TCTTE storage to be deleted in this case, specify AUTOCONNECT(NO).