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Oracle® Database Reference
11g Release 1 (11.1)

Part Number B28320-01
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Property Description
Parameter type Integer
Default value 0 (disabled)
Range of values 0 or any integer in [60, 7200]
Basic No
Real Application Clusters Multiple instances should use the same value.

ARCHIVE_LAG_TARGET limits the amount of data that can be lost and effectively increases the availability of the standby database by forcing a log switch after the specified amount of time elapses.

A 0 value disables the time-based thread advance feature; otherwise, the value represents the number of seconds. Values larger than 7200 seconds are not of much use in maintaining a reasonable lag in the standby database. The typical, or recommended value is 1800 (30 minutes). Extremely low values can result in frequent log switches, which could degrade performance; such values can also make the archiver process too busy to archive the continuously generated logs.

See Also:

Oracle Data Guard Concepts and Administration for more information about criteria for setting this parameter