Asynchronous I/O

The database server performs database I/O asynchronously, meaning that I/O is queued and performed independently of the thread that requests the I/O. Performing I/O asynchronously allows the thread that makes the request to continue working while the I/O is being performed.

The database server performs all database I/O asynchronously, using one of the following facilities:
  • AIO virtual processors
  • KAIO on platforms that support it

Database I/O includes I/O for SQL statements, read-ahead, page cleaning, and checkpoints.

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