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storageDatabase•databaseDatabase Errorhourglass_bottomTimeoutdns500-errorerrorerrorsettingsserver_configuration•star_halfUncommon•warningModerate

KILLED QUERY

A KILLED QUERY error occurs when MySQL stops a statement before it finishes. The database server aborts the query when it exceeds limits such as execution time, lock wait, packet size, or resource usage. WordPress records the event in the debug log and will show a generic 500 response.

Typical triggers include long‑running SELECTs on large tables, missing indexes, or manual kill commands. The platform enforces a 60‑second timeout and a 750 ms slow‑query threshold, and any breach results in the query being terminated.

Symptoms

[dashicons-warning]
HTTP 500 error
You see a generic server error page. WordPress cannot complete the request.
[dashicons-admin-page]
Blank page
The page stops rendering after the header. No content appears.
[dashicons-database]
Debug log entry
WP_DEBUG_LOG contains a KILLED QUERY line. It appears intermittently.

Common Causes

MySQL timeout
The query runs longer than 60 seconds. MySQL kills the thread.
Lock wait timeout
InnoDB aborts the statement after the lock‑wait limit expires.
Packet size limit
The statement exceeds max_allowed_packet. MySQL terminates it.
Unoptimized query
Missing indexes cause a full table scan. Execution time exceeds the slow‑query threshold.
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