ARCHIVE_LAG_TARGET
|
Parameter type |
Integer |
|
Default value |
0 (disabled) |
|
Parameter class |
Dynamic: ALTER SYSTEM |
|
Range of values |
0 or any integer in [60, 7200] |
|
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 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.
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