问题描述
sql> select open_mode from v$database;
OPEN_MODE
----------------------------------------
READ ONLY WITH APPLY
归档日志正常应用：
sql> select name,applied,thread#,first_change#,next_change# from v$archived_log order by next_change# desc;
NAME APPLIED THREAD# FirsT_CHANGE# NEXT_CHANGE#
-------------------------------------------------- ------------------ ---------- ------------- ------------
/u01/arch/1_162_1052306063.arc YES 1 10493050 10493218
/u01/arch/2_167_1052306063.arc YES 2 10493061 10493215
/u01/arch/2_166_1052306063.arc YES 2 10485581 10493061
/u01/arch/1_161_1052306063.arc YES 1 10486829 10493050
/u01/arch/1_160_1052306063.arc YES 1 10486823 10486829
/u01/arch/2_165_1052306063.arc YES 2 10285021 10485581
/u01/arch/1_159_1052306063.arc YES 1 10385533 10385535
/u01/arch/1_158_1052306063.arc YES 1 10285024 10385533
/u01/arch/1_157_1052306063.arc YES 1 10274975 10285024
/u01/arch/2_164_1052306063.arc YES 2 10274972 10285021
/u01/arch/1_156_1052306063.arc YES 1 10274911 10274975
数据文件是只读的，并且 checkpoint_change# 位于 online-redolog 后面：
sql> select checkpoint_change#,enabled from v$datafile;
CHECKPOINT_CHANGE# ENABLED
------------------ --------------------
10486829 READ ONLY
10486829 READ ONLY
10486829 READ ONLY
2168270 READ ONLY
2168270 READ ONLY
10486829 READ ONLY
2168270 READ ONLY
10486829 READ ONLY
4843272 READ ONLY
4843272 READ ONLY
4843272 READ ONLY
CHECKPOINT_CHANGE# ENABLED
------------------ --------------------
4843272 READ ONLY
4843272 READ ONLY
4843271 READ ONLY
4843271 READ ONLY
4843271 READ ONLY
16 rows selected.
sql>
sql>
sql> select * from v$standby_log;
GROUP# DBID THREAD# SEQUENCE# BYTES BLOCKSIZE USED ARCHIV STATUS FirsT_CHANGE# FirsT_TIME NEXT_CHANGE# NEXT_TIME LAST_CHANGE# LAST_TIME CON_ID
---------- -------------------------------------------------------------------------------- ---------- ---------- ---------- ---------- ---------- ------ -------------------- ------------- ------------------ ------------ ------------------ ------------ ------------------ ----------
5 537310974 1 163 209715200 512 4165632 YES ACTIVE 10493218 2020:12:2214:36:21 10499539 2020:12:2214:51:18 0
6 UNASSIGNED 1 0 209715200 512 0 NO UNASSIGNED 0
7 UNASSIGNED 1 0 209715200 512 0 YES UNASSIGNED 0
8 537310974 2 168 209715200 512 4459008 YES ACTIVE 10493215 2020:12:2214:36:21 10499539 2020:12:2214:51:18 0
9 UNASSIGNED 2 0 209715200 512 0 NO UNASSIGNED 0
10 UNASSIGNED 2 0 209715200 512 0 YES UNASSIGNED 0
6 rows selected.
所以我的问题是，由于数据文件是只读的并且 checkpoint_change# 没有改变，那么从主数据库发送的日志在哪里应用？如果应用于备库中的数据文件，它的checkpoint_change#不增加吗？
解决方法
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