Performance hit implementing last authentication time (pwdKeppLastAuthTime)

Question

I have a DSEE 6.1 installation running on solaris 10.
There are about 100 users in the directory, but soon to have another 3000 added as it is properly productionized.
I notice there is a warning that pwdKeepLastAuthTime feature is not activated by default as it adds an update for each successful bind operation.
I wanted to enable this so set:
dsconf set-server-prop pwd-keep-last-auth-time-enabled:on
This has resulted in the db size <instance>/db increasing 100 fold from ~10mb to ~1gb.
The memory size is now at ~800mb.
Is this expected behaviour?

Answer 1

/opt/ds/db" > ls -l
total 137126
-rw------- 1 nobody nobody 24576 Oct 31 09:21 __db.001
-rw------- 1 nobody nobody 10264576 Nov 13 00:53 __db.002
-rw------- 1 nobody nobody 41951232 Nov 13 00:53 __db.003
-rw------- 1 nobody nobody 1572864 Nov 13 00:53 __db.004
-rw------- 1 nobody nobody 11313152 Nov 13 00:53 __db.005
-rw------- 1 nobody nobody 65536 Nov 13 00:53 __db.006
-rw------- 1 nobody nobody 38 May 31 16:16 DBVERSION
-rw------- 1 nobody nobody 10485760 Nov 13 09:02 log.0000001204
drwx------ 2 nobody nobody 1536 Sep 6 12:07 zeus
"/opt/ds/db" > du -sk *
24 __db.001
10032 __db.002
41000 __db.003
1544 __db.004
11056 __db.005
64 __db.006
1 DBVERSION
4904 log.0000001204
1339315 zeus
opt/ds/db/zeus" > ls -l
total 2678626
-rw------- 1 nobody nobody 1369350144 Nov 13 09:03 cl5dc_zeus_dc_ghsewn_dc_com463ff1cb000000010000.db3
-rw------- 1 nobody nobody 38 Jun 1 11:55 DBVERSION
-rw------- 1 nobody nobody 16384 Jun 21 12:47 zeus_aci.db3
-rw------- 1 nobody nobody 16384 Oct 31 09:37 zeus_ancestorid.db3
-rw------- 1 nobody nobody 81920 Oct 31 09:37 zeus_cn.db3
-rw------- 1 nobody nobody 32768 Oct 31 09:37 zeus_entrydn.db3
-rw------- 1 nobody nobody 16384 Oct 31 09:37 zeus_gidnumber.db3
-rw------- 1 nobody nobody 909312 Nov 13 09:03 zeus_id2entry.db3
-rw------- 1 nobody nobody 16384 Aug 10 14:52 zeus_nisnetgrouptriple.db3
-rw------- 1 nobody nobody 16384 Nov 7 09:38 zeus_nscpEntryDN.db3
-rw------- 1 nobody nobody 16384 Jun 1 11:57 zeus_nsds5ReplConflict.db3
-rw------- 1 nobody nobody 16384 Oct 31 09:37 zeus_nsRoleDN.db3
-rw------- 1 nobody nobody 40960 Nov 7 09:38 zeus_nsuniqueid.db3
-rw------- 1 nobody nobody 16384 Jun 13 11:26 zeus_numsubordinates.db3
-rw------- 1 nobody nobody 24576 Nov 7 09:38 zeus_objectclass.db3
-rw------- 1 nobody nobody 16384 Oct 31 09:37 zeus_parentid.db3
-rw------- 1 nobody nobody 16384 Nov 11 16:18 zeus_pwdaccountlockedtime.db3
-rw------- 1 nobody nobody 16384 Nov 12 15:00 zeus_pwdfailuretime.db3
-rw------- 1 nobody nobody 16384 Nov 9 11:46 zeus_pwdgraceusetime.db3
-rw------- 1 nobody nobody 16384 Jun 20 16:07 zeus_sn.db3
-rw------- 1 nobody nobody 16384 Jun 20 09:50 zeus_sudoUser.db3
-rw------- 1 nobody nobody 16384 Oct 31 09:37 zeus_uid.db3
-rw------- 1 nobody nobody 16384 Oct 31 09:37 zeus_uidNumber.db3
-rw------- 1 nobody nobody 16384 Oct 24 13:03 zeus_vlv#zeusghsewncomgetgrent.db3
-rw------- 1 nobody nobody 16384 Aug 10 14:52 zeus_vlv#zeusghsewncomgetngrpent.db3
-rw------- 1 nobody nobody 16384 Nov 13 08:57 zeus_vlv#zeusghsewncomgetpwent.db3
-rw------- 1 nobody nobody 16384 Nov 13 08:57 zeus_vlv#zeusghsewncomgetspent.db3
"/opt/ds/db/zeus" > du -sk *
1337920 cl5dc_zeus_dc_ghsewn_dc_com463ff1cb000000010000.db3
1 DBVERSION
16 zeus_aci.db3
16 zeus_ancestorid.db3
80 zeus_cn.db3
32 zeus_entrydn.db3
16 zeus_gidnumber.db3
896 zeus_id2entry.db3
16 zeus_nisnetgrouptriple.db3
16 zeus_nscpEntryDN.db3
16 zeus_nsds5ReplConflict.db3
16 zeus_nsRoleDN.db3
40 zeus_nsuniqueid.db3
16 zeus_numsubordinates.db3
24 zeus_objectclass.db3
16 zeus_parentid.db3
16 zeus_pwdaccountlockedtime.db3
16 zeus_pwdfailuretime.db3
16 zeus_pwdgraceusetime.db3
16 zeus_sn.db3
16 zeus_sudoUser.db3
16 zeus_uid.db3
16 zeus_uidNumber.db3
16 zeus_vlv#zeusghsewncomgetgrent.db3
16 zeus_vlv#zeusghsewncomgetngrpent.db3
16 zeus_vlv#zeusghsewncomgetpwent.db3
16 zeus_vlv#zeusghsewncomgetspent.db3