1. Database Reference
  2. Initialization Parameters
  3. Initialization Parameters
  4. DISK_ASYNCH_IO

1.99 DISK_ASYNCH_IO

DISK_ASYNCH_IO controls whether I/O to datafiles, control files, and logfiles is asynchronous (that is, whether parallel server processes can overlap I/O requests with CPU processing during table scans).

Property Description

Parameter type

Boolean

Default value

true

Modifiable

No

Modifiable in a PDB

No

Range of values

true | false

Basic

No

If your platform supports asynchronous I/O to disk, Oracle recommends that you leave this parameter set to its default value. However, if the asynchronous I/O implementation is not stable, you can set this parameter to false to disable asynchronous I/O. If your platform does not support asynchronous I/O to disk, this parameter has no effect.

If you set DISK_ASYNCH_IO to false, then you can increase DB_WRITER_PROCESSES or use DBWR_IO_SLAVES to simulate asynchronous I/O.

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