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Time spent by the various sessions waiting for the completion of I/O operations required to carry out a bulk load I/O.
While bulk loading significantly reduces the amount of I/O activity required for loading large amounts of data to the database inside of a single transaction, this operations still takes a relatively long time to complete.
Time spent by the various sessions waiting for I/O operations to complete.
Time spent by the various sessions waiting to latch a buffer for an I/O request; this wait is related to issues with the disk I/O subsystem.
Time spent waiting for disk input/output operations to complete.
Input/output (I/O) is one of the most expensive operations in a database system. SQL statements that are I/O intensive can monopolize memory and disk use and cause other database operations to compete for these resources.
Generally, I/O Wait is caused by poorly-tuned SQL queries or applications which generate a significant amount of logical I/O translating into excessive physical disk usage. In this case, SQL/application tuning can reduce the logical I/O- induced load. However, it could also be caused by poorly-configured disks or storage sub-systems.
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