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Oracle sysdate内部时间与操作系统不一致

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Release: 2016-06-07 17:22:05
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Oracle 11g RAC,内部时间是通过ctss服务进行同步的,在安装时候,默认都会将ntpd去掉,使用ctss。但是运行一段时间后发现,orac

Oracle 11g RAC,,内部时间是通过ctss服务进行同步的,在安装时候,默认都会将ntpd去掉,使用ctss。
但是运行一段时间后发现,oracle内部时间和操作系统存在时间上的差异,因此,oracle数据库和操作系统需要一个时间同步服务器;

/sbin/service ntpd status
ntpd (pid 4403) is running...

ps -ef|grep ntp
ntp      2113    1  0 Dec09 ?        00:00:00 ntpd -u ntp:ntp -p /var/run/ntpd.pid -x

grep OPTIONS /etc/sysconfig/ntpd
OPTIONS="-u ntp:ntp -p /var/run/ntpd.pid -x"

To start:

/sbin/service ntpd start

[grid@rac01 ~]$ crsctl check ctss
 CRS-4701: The Cluster Time Synchronization Service is in Active mode.
 CRS-4702: Offset (in msec): 0
 
当ctss检测到系统上有ntp时,会自动将模式切换到被动模式
[grid@HBCADB001 ~]$ crsctl check ctss
CRS-4700: The Cluster Time Synchronization Service is in Observer mode.
 
SQL> select sessiontimezone,to_char(sysdate,'yyyymmdd hh24:mi:ss') from dual;
SESSIONTIMEZONE
---------------------------------------------------------------------------
TO_CHAR(SYSDATE,'
-----------------
+08:00
20121029 14:14:10

SQL> !date
Mon Oct 29 14:14:13 CST 2012
SQL>

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