Query OK, 0 rows affected (0.00 sec) She ran SHOW PROCESSLIST again. The row with Id 19283 was gone — replaced by a single line: KILLED (for a brief moment, then disappeared).
The next morning, Maya added a monitoring alert for queries running longer than 60 seconds. She also taught the dev team how to catch themselves: mysql kill a query
Almost six minutes. That single query was hogging the CPU, locking critical rows, and starving the checkout service. Query OK, 0 rows affected (0
She groggily opened her laptop, heart already racing. The company’s main e-commerce site was slowing to a crawl. Users couldn’t load their carts. She also taught the dev team how to
KILL QUERY 19283; A second later, MySQL responded:
She SSH’d into the production database server and ran the usual triage:
It was 2:13 AM on a Tuesday. Maya, the only on-call database engineer, jolted awake by a relentless buzz from her phone.