1.172 LOG_CHECKPOINT_TIMEOUT

LOG_CHECKPOINT_TIMEOUT specifies (in seconds) the amount of time 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.

Property	Description
Parameter type	Integer
Default value	1800
Modifiable	ALTER SYSTEM
Modifiable in a PDB	No
Range of values	0 to 231 - 1
Basic	No
Oracle RAC	Multiple instances can have different values.

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

Note:

• 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 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:

• "LOG_CHECKPOINT_TIMEOUT"

• "V$INSTANCE_RECOVERY"

• Oracle Database Performance Tuning Guide for information on disabling or removing this parameter when the FAST_START_MTTR_TARGET parameter is set