|Oracle® Database Reference
10g Release 1 (10.1)
Part Number B10755-01
|Default value||All the buffers in the cache|
|Range of values||1000 to all buffers in the cache. A setting of 0 disables limiting recovery I/Os.|
|Real Application Clusters||Multiple instances can have different values, and you can change the values at runtime.|
Note:This parameter is deprecated in favor of the
FAST_START_IO_TARGET (available only with the Oracle Enterprise Edition) specifies the number of I/Os that should be needed during crash or instance recovery.
When you set this parameter,
n writes dirty buffers out more aggressively, so that the number of blocks that must be processed during recovery stays below the value specified in the parameter. However, this parameter does not impose a hard limit on the number of recovery I/Os. Under transient workload situations, the number of I/Os needed during recovery may be greater than the value specified in this parameter. In such situations,
n will not slow down database activity.
Smaller values for this parameter result in faster recovery times. This improvement in recovery performance is achieved at the expense of additional writing activity during normal processing.
Setting this parameter to 0 disables fast-start checkpointing, which is the mechanism that limits the number of I/Os that need to be performed during recovery. All other writing activity is unaffected.
Notes:Recovery I/O can also be limited by setting the