A detailed Oracle 10g case study reveals how excessive log file sync waits, caused by I/O performance problems and frequent log switches on aging mechanical storage, lead to database hangs, and provides step‑by‑step analysis and practical mitigation tips.
An Oracle 10g database froze at 10 am due to a massive log file sync wait, traced through AWR analysis to I/O performance problems and excessive commit activity, with root‑cause verification via LGWR switch frequency, parallel‑write latency, and alert log errors, leading to practical remediation steps.
During high‑concurrency flash‑sale events, Oracle’s log file sync became a performance bottleneck; the article analyzes storage, OS, and Oracle Disk Manager factors, presents AWR metrics, demonstrates tuning steps—including disabling adaptive log file sync and enabling ODM—and shows measurable latency reductions.
