ARCHIVE_LAG_TARGET
| Property |
Description |
| Parameter type |
Integer |
| Default value |
0(disabled) |
| Modifiable |
ALTER SYSTEM |
| Range of values |
0 or any integer in [60, 7200] |
| Basic |
No |
| Oracle RAC |
Multiple instances should use the same value. |
ARCHIVE_LAG_TARGETforces 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 Administrationfor more information about criteria for setting this parameter
设置归档时间间隔为30分钟，并查看效果
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SYS@test>alter system set archive_lag_target=1800;
System altered.
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[oracle@test archive_log]$
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end
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