How to Manually remove the OEM Agent

How to Manually remove the OEM Agent

Purpose and Scope: You are trying to de-install the old agent and then re-install the newer version of the Agent and running into various issues.

Best Method:
1) Stop the Agent (all nodes in case of RAC)
2) Go to OEM Grid Control and remove all targets associated with the host/database to be removed, which includes databases, listeners, hosts, agents.
3) Make sure to verify from the OEM Grid Control that the targets you were trying to remove are completely removed. Try looking up from Targets=>All Targets and search for the name and you should NOT see any results.
4) Go to the $AGENT_HOME and remove Agent home from Linux/Unix box.
a) $ rm –rf agent10g
b) $ rm –rf agent10gInventory
c) $ rm –f $TNS_ADMIN/oraInst.agent10g..loc

If you want to re-install the agent, the re-install of the agent should work without issues but if for some reason the above does not work, try executing the following steps to manually remove the agent.

You can also remove the Agent by following the Metalink Note:436679.1 on
How to Remove an Orphaned Target Using the EMDiag Kit 10.2

The above should do the trick but sometimes it is not completely removed from the repository and when you install the newer version it gives various erros.

The following method should remove it completely

1) Login to oemdb as SYS and -

select * from sysman.mgmt_targets_delete
where delete_complete_time is NULL
order by target_name

This lists all target deletions that did not complete for some reason (normally the delet_complete_time would show the timestamp of when the target was removed.

2) Find all targets that belong to the system you are having issues with

3) Run the following to complete the deletion –

exec mgmt_admin.delete_target('rklx1_rk_crs','cluster');
where ‘'rklx1_rk_crs' is the clustername and also is the “target_name column from the earlier query and “cluster” is the target_type

4) If this doesn’t work then do this –
Log into oemdb and run –

alter index SYSMAN.MGMT_STRING_METRIC_HISTORY_PK rebuild;

5) Then remove it using this procedure –
exec mgmt_admin.delete_target_internal('rklx1_rk_crs','cluster');

For the agent you could try –

exec mgmt_admin.cleanup_agent(’host.domain:3872’);