If you want to clean up your ADMIN2 file from all users not having logged on for a long time you find help here:
First, create a TPXBATCH job listing all users with their last logon date (that date is stored in field VUSRDACC). Fiel 'aaa.bbb.REPORT' is preallocated with FB=80:
//BATCHADM EXEC
//SORTING EXEC PGM=SORT
//SORTIN DD DSN=aaa.bbb.REPORT,DISP=SHR
//SORTLIB DD DSN=SYS1.SORTLIB,DISP=SHR
//SORTOUT DD DSN=aaa.bbb.SORTREP,DISP=SHR
//SORTWK01 DD UNIT=SYSDA,VOL=SER=vvvvvv,SPACE=(CYL,(2,2))
//SORTWK02 DD UNIT=SYSDA,VOL=SER=vvvvvv,SPACE=(CYL,(2,2))
//SYSOUT DD SYSOUT=A
//SYSIN DD *
SORT FIELDS=(17,2,CH,A,14,2,CH,A,11,2,CH,A)
/*
The result is a list like this:
SAMPLE output
-------- ----------
1USERNAME LAST LOGON
TPX123 09/03/10
TIERTEST 09/09/11
HIHEWRS 10/17/11
FRANK 04/05/12
TPXADMIN 10/17/12
GILHA03 05/22/12
MEYER 01/26/12
ERWIN 07/10/13
PIEALE1 10/30/13
From here you can decide which users may be removed from ADMIN2 files because they have not logged on for more than x months or years.
More details are available in technical document TEC604439.