设置数据库归档时间间隔，比如30分钟归档一次。
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
SYS@test>alter system set archive_lag_target=1800;
System altered.
-rw-r-----. 1 oracle oinstall 2560 May 15 13:34 1_196_963738576.arc
-rw-r-----. 1 oracle oinstall 38250496 May 17 09:00 1_197_963738576.arc
-rw-r-----. 1 oracle oinstall 15360 May 17 09:00 1_198_963738576.arc
-rw-r-----. 1 oracle oinstall 42948096 May 17 10:03 1_199_963738576.arc
-rw-r-----. 1 oracle oinstall 43029504 May 17 19:00 1_200_963738576.arc
-rw-r-----. 1 oracle oinstall 4195840 May 17 19:43 1_201_963738576.arc
-rw-r-----. 1 oracle oinstall 3424256 May 17 20:13 1_202_963738576.arc
-rw-r-----. 1 oracle oinstall 1565184 May 17 20:43 1_203_963738576.arc
-rw-r-----. 1 oracle oinstall 3587072 May 17 21:13 1_204_963738576.arc
-rw-r-----. 1 oracle oinstall 1616384 May 17 21:43 1_205_963738576.arc
[oracle@test archive_log]$
end