How to Adjust the Time of Oracle Database（oracle修改时间）

As we know, Oracle DB is the most popular and widely used commercial enterprise DBMS in the world. Time adjustment is very essential for Oracle DB, for incorrect time setting in the Oracle database can affect the stability and accuracy of the data. Here, we will introduce the steps to adjust the time of Oracle database.

First of all, log in to the server that hosts the Oracle Database. If your system is a Microsoft Windows server, you can use the date and time tools in the system settings to adjust the time manually or synchronize the time with an NTP server. If your system is a Unix or Linux server, you can use the command “date” and “clock” to adjust the time manually or synchronize the time with an NTP server.

Once the system time has been adjusted, the next step is to adjust the Oracle Database’s internal time. To achieve this, we use Oracle Database’s “alter system set” command. For example, to synchronize the Oracle Database’s internal time to match the system time, we would use this command:

ALTER SYSTEM SET TIME_ZONE=’+09:00’ SCOPE=SPFILE;

Note that this command should be executed when the Oracle database is started up in exclusive mode, and “+09:00” should be replaced by the appropriate best local time zone.

Finally, we can confirm that the Oracle database’s internal time has been adjusted properly. To this end, we can execute Oracle Database’s “select * from v$timezone_file” command to get the current time zone and system time. After executing this command, if we find that the time zone and system time match the local time, we can confirm that the Oracle database’s time has been successfully adjusted.

In short, to adjust the time of the Oracle database, we should first adjust the system time, then use the Oracle Database’s “alter system set” command to adjust the internal time, and finally confirm the success of the time adjustment by querying the Oracle database’s “v$timezone_file” table.