Spotlight on Oracle 11.0 - Getting Started Guide

Write Complete Wait Alarm

The Write Complete Wait alarm occurs when the proportion of write complete waits to total waits exceeds a threshold.

Write complete waits occur when a session tries to modify a block that is currently being written to disk by the database writer process. This happens occasionally (especially during checkpoints), but if it contributes significantly to overall waits, it may indicate inefficiency in the database writer. The solution may involve optimizing datafile I/O and database writer configuration by:

• Spreading datafiles across multiple disks,
• Using multiple database writers, and
• Employing asynchronous or list I/O.

Related Topics

Improve Database Writer Performance