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What's the difference about "DB time" between v$sysstat and v$sys_time_model?

Quanwen ZhaoSep 18 2021 — edited Oct 17 2021

Hi my friends and guys ,
Anybody else knows what's the difference about "DB time" between v$sysstat and v$sys_time_model? and what unit with the value (microsecond or millisecond)?

16:21:41 SYS@emcdb> set linesize 80
16:21:44 SYS@emcdb> desc v$sysstat
 Name                   Null?   Type
 --------------------- -------- ----------------------------
 STATISTIC#                     NUMBER
 NAME                           VARCHAR2(64)
 CLASS                          NUMBER
 VALUE                          NUMBER
 STAT_ID                        NUMBER
 CON_ID                         NUMBER

16:21:49 SYS@emcdb> desc v$sys_time_model
 Name                   Null?    Type
 ---------------------  -------- ----------------------------
 STAT_ID                         NUMBER
 STAT_NAME                       VARCHAR2(64)
 VALUE                           NUMBER
 CON_ID                          NUMBER

16:21:54 SYS@emcdb> col name for a10
16:22:31 SYS@emcdb> col stat_name for a10
16:23:52 SYS@emcdb> col value for 999,999,999,999.99

16:23:57 SYS@emcdb> select stat_name, value from v$sys_time_model where stat_name = 'DB time';

STAT_NAME  VALUE
---------- -------------------
DB time    35,869,600,586.00

16:23:58 SYS@emcdb> select name, value from v$sysstat where name = 'DB time';

NAME       VALUE
---------- -------------------
DB time    1,162,450,336.00

16:24:04 SYS@emcdb> 

Thank you very much!
Best Regards
Quanwen Zhao

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Added on Sep 18 2021
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