Raised when a KILL statement targets a thread the current user does not own and the account lacks SUPER (≤5.7) or SYSTEM_USER (8.0+) privilege.
MySQL Error 1095: ER_KILL_DENIED_ERROR happens when you run KILL on a thread you do not own without SUPER (≤5.7) or SYSTEM_USER privilege. Connect as the thread owner or grant the needed privilege, then rerun KILL to clear the error.
You are not owner of thread %lu
MySQL raises Error 1095 (ER_KILL_DENIED_ERROR) with the message "You are not owner of thread %lu" when a session issues the KILL command against a connection it does not own.
The server rejects the request because the authenticated account lacks the SUPER privilege in MySQL 5.7 or the combination of SYSTEM_USER and PROCESS in MySQL 8.0+.
The error stops unprivileged users from terminating other sessions, protecting stability.
Running KILL against a thread started by a different user without elevated privileges triggers the error immediately.
Administrative privilege changes in MySQL 8.0 also surface the error if SYSTEM_USER is missing even for accounts that once had SUPER.
High connection churn, automated scripts, or GUI tools can select the wrong thread ID, causing accidental attempts to kill a foreign connection and producing the same error.
First, verify the thread owner with SHOW PROCESSLIST or INFORMATION_SCHEMA.PROCESSLIST.
If you own the connection, connect using that account before running KILL.
When administrative termination is required, log in with a role that has SUPER (MySQL 5.7) or SYSTEM_USER plus PROCESS (MySQL 8.0+). Grant the privilege to a dedicated admin user instead of modifying every account.
In production, DBAs often run maintenance scripts that need to kill idle ETL connections.
Adding SYSTEM_USER to the service account fixes repeated failures.
Shared development databases see this error when developers try to cancel each other’s long queries. Assign a single privileged role or use Galaxy’s approval workflow to centralize connection management securely.
Create a limited administrative account with SYSTEM_USER or SUPER and reserve KILL for that login.
Record its use with general logs or an audit plugin.
Within Galaxy, endorsed administrative snippets can include privilege checks, and role-based access control ensures only authorized users can run those snippets, minimizing accidental misuse.
Error 1094 (ER_BAD_THREAD_ID) appears when the target thread ID does not exist. Error 1227 (ER_SPECIFIC_ACCESS_DENIED_ERROR) surfaces when any privilege, not just KILL, is missing. The fixes mirror those for Error 1095: check thread ID and grant proper rights.
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Users without SUPER privilege cannot terminate sessions they do not own. Attempting KILL in this context triggers Error 1095.
MySQL 8.0 splits SUPER. Accounts need both SYSTEM_USER and PROCESS to kill others.
Lacking either returns ER_KILL_DENIED_ERROR.
Even if the user has the KILL command, targeting a thread that belongs to a different user without required privilege causes the error.
Automation or human error may select a thread ID from SHOW PROCESSLIST that has already changed owners, leading to the permission denial.
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In MySQL 8.0, the SUPER privilege is split. Verify that root still holds SYSTEM_USER and PROCESS, or GRANT them explicitly.
Yes. Users can always kill their own thread without extra privileges. Prevent accidental cross-kills by omitting SYSTEM_USER from developer roles.
Run SHOW PROCESSLIST or query INFORMATION_SCHEMA.PROCESSLIST, then copy the ID column value.
Galaxy forwards any valid SQL, including KILL. Its role based access control ensures only authorized users can run the statement.
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