Linux: Disable Kdump

July 10, 2025 Leave a comment

To disable Kdump, follow these steps:

1. Disable the kdump service:

# systemctl disable --now kdump.service

2. Check that the kdump service is inactive:

# systemctl status kdump.service

3. Remove kexec-tools package

# rpm -e kexec-tools

4. (Optional) Remove the crashkernel command-line parameter from the current kernel by running the following command:

# grubby --remove-args="crashkernel" --update-kernel=/boot/vmlinuz-$(uname -r)

Or set the desired value using grubby --update-kernel=/boot/vmlinuz-$(uname -r) --args="crashkernel=....” (Instead of dots, indicate your value).

ℹ️ One possible error that may occur when removing the kexec-tools package is that it might indicate that the package is not installed, even though it actually is. In this case, you can try rebuilding the RPM database and then rerunning the erase command.

# rpm --rebuilddb
# rpm -e kexec-tools

Filed under Linux, Oracle Enterprise Linux, OS Tagged with , , , , , ,

Disable Auto Space Advisor

June 24, 2018 Leave a comment

On our production database Segment Space Advisor jobs were running very frequently with different names “SYS.ORA$AT_SA_SPC_SY_***”.  That was causing 100% of IO activity when was creating advise on the table containing XML files . LOB segment space for this table is 565G.

In my opinion, it is fare to disable this auto task and run manually whenever you want.

BEGIN
DBMS_AUTO_TASK_ADMIN.disable(
client_name => ‘auto space advisor’,
operation => NULL,
window_name => NULL);
END;
/

Check the status:

SQL> select client_name, status
2 from dba_autotask_client;

CLIENT_NAME STATUS
———————————————-
auto optimizer stats collection ENABLED
auto space advisor DISABLED
sql tuning advisor DISABLED

Thanks to Fikria for this case 🙂

Filed under 12c, Real World Scenarios Tagged with , ,