This section reports the total number of disk I/O checks, and the number of checks returning I/O.
Total Checks
"Total Checks" reports the number of times engines checked for disk I/O.
When a task needs to perform I/O, the Adaptive Server engine running that task immediately issues an I/O request and puts the task to sleep, waiting for the I/O to complete. The engine then processes other tasks, if any. It also loops to check for completed I/Os. When the engine finds completed I/Os, it moves the task from the sleep queue to the run queue.
I/O Checks
I/O checks is a subset of the Total Checks. It reports the number of times when a engine checked for I/O that there was a requested I/O pending or waiting.
* Available only for Adaptive Servers versions prior to 12.5.0.3
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