Refresh security information.
The PERFORM SECURITY REBUILD command is a request for CICS security information to be refreshed from its external security manager (ESM) source, so that it reflects any updates made since the information was last retrieved.
Since RACF Version 2.1, the refresh process is automatic; PERFORM SECURITY REBUILD is not required, and has no effect if issued.
If your CICS uses another ESM, the effect of this command depends on the particular ESM.
If the ESM is not RACF Version 2.1 or later, and the command completes normally (a RESP code value of NORMAL), a RESP2 code of 0 indicates that the profiles have been refreshed. A RESP2 code of 4 means that no action was required, because RACF was at Version 2.1 or later, in which profiles are refreshed automatically.