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How Oracle Restart SCAN

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  • March 7, 2020June 24, 2022

You cannot stop SCAN (Single Client Access Name) before stopping SCAN_LISTENER, so if you want to restart SCAN, you have to consider how to handle SCAN_LISTENER.

Soft Restart

Here we take 4 steps to restart the whole SCAN services.

[grid@primary01 ~]$ srvctl stop scan_listener
[grid@primary01 ~]$ srvctl stop scan
[grid@primary01 ~]$ srvctl start scan
[grid@primary01 ~]$ srvctl start scan_listener

You can also execute them without gaps in one line if you do care the smoothness.

[grid@primary01 ~]$ srvctl stop scan_listener; srvctl stop scan; srvctl start scan; srvctl start scan_listener

Additionally, if you also want to restart local listeners, you should take the order as below.

[grid@primary01 ~]$ srvctl stop listener
[grid@primary01 ~]$ srvctl stop scan_listener
[grid@primary01 ~]$ srvctl stop scan
[grid@primary01 ~]$ srvctl start scan
[grid@primary01 ~]$ srvctl start scan_listener
[grid@primary01 ~]$ srvctl start listener

Hard Restart

We take 2 steps to restart the whole SCAN services.

[grid@primary01 ~]$ srvctl stop scan -force
[grid@primary01 ~]$ srvctl start scan

The flag -force is used to force all SCAN related components to shutdown without considering their statuses, which include both SCAN and SCAN_LISTENER.

Please note that, while you start SCAN, SCAN_LISTENER is also started, that is, you don't have to start SCAN_LISTENER explicitly.

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