Exploring the IO_COMPLETION Wait Type in SQL Server
Introduction In SQL Server, the IO_COMPLETION wait type signals that a session is waiting for non-data-page I/O operations to complete. This post examines its causes, impact, and troubleshooting steps. What is IO_COMPLETION? The IO_COMPLETION wait type occurs when SQL Server waits for I/O tasks, such as transaction log writes or backups, to finish. Unlike PAGEIOLATCH waits, it involves non-data-page I/O, like log files or DBCC operations. Common Causes Transaction log writes during commits or checkpoints. Database backups or restores. DBCC …
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