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Parameter type
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Integer
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Default value
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0 (disabled)
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Parameter class
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Dynamic: ALTER SYSTEM
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Range of values
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0 or any integer in [60, 7200]
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Real Application Clusters
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Multiple instances should use the same value.
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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 a user-specified time period 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.
