LOG_CHECKPOINT_TIMEOUT

Parameter type	Integer
Default value	Oracle9i: 900 seconds Oracle9i Enterprise Edition: 1800 seconds
Parameter class	Dynamic: ALTER SYSTEM
Range of values	0 to unlimited
Oracle9i Real Application Clusters	Multiple instances can have different values.

LOG_CHECKPOINT_TIMEOUT specifies the amount of time, in seconds, that has passed since the incremental checkpoint at the position where the last write to the redo log (sometimes called the tail of the log) occurred. This parameter also signifies that no buffer will remain dirty (in the cache) for more than integer seconds.

Specifying a value of 0 for the timeout disables time-based checkpoints. Hence, setting the value to 0 is not recommended.

Notes: A checkpoint scheduled to occur because of this parameter is delayed until the completion of the previous checkpoint if the previous checkpoint has not yet completed. Recovery I/O can also be limited by setting the FAST_START_IO_TARGET or LOG_CHECKPOINT_INTERVAL parameter or by the size specified for the smallest redo log. For information on which mechanism is controlling checkpointing behavior, query the V$INSTANCE_RECOVERY view.

See Also: Oracle9i Database Performance Guide and Reference for more information on setting this parameter "FAST_START_IO_TARGET", "LOG_CHECKPOINT_TIMEOUT", and "V$INSTANCE_RECOVERY"