Journal sequence difference between Instances RAC
RDBMS Version: 11.2Platform: Solaris 10
In our CAR database, we have 6 recovery logs.
SQL> select * from v$logfile order by 1,2;
GROUP# STATUS TYPE MEMBER IS_
---------- ------- ------- ---------------------------------------------------- ---
1 ONLINE +ORCL_ARCH01/ORCL_ARCH/orcl_log01.dbf NO
2 ONLINE +ORCL_ARCH01/ORCL_ARCH/orcl_log02.dbf NO
3 ONLINE +ORCL_ARCH01/ORCL_ARCH/orcl_log03.dbf NO
4 ONLINE +ORCL_ARCH01/ORCL_ARCH/orcl_log04.dbf NO
5 ONLINE +ORCL_ARCH01/ORCL_ARCH/orcl_log05.dbf NO
6 ONLINE +ORCL_ARCH01/ORCL_ARCH/orcl_log06.dbf NO
6 rows selected.
Logically or should I say 'in house', 3 newspapers of recovery is allocated per thread. But they all belong to a database.SQL> select group#,thread#,members from v$log order by 1,2;
GROUP# THREAD# MEMBERS
---------- ---------- ----------
1 1 1
2 1 1
3 1 1
4 2 1
5 2 1
6 2 1
6 rows selected.
SQL> exit;
If all of these 6 redo log files belong to a database, then why they have different max (sequence #)?That is to say. The 'more old sequence online journal' in Node1 3432 watch and
"More old newspaper online sequence ' in watch 3188 Node2 (a difference of 244)
-- Instance1 in Node1
SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination +ORCL_ARCH01/ORCL_ARCH
Oldest online log sequence 3432 ------------------------->
Next log sequence to archive 3434
Current log sequence 3434
-- Instance 2 in Node2
SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination +ORCL_ARCH01/ORCL_ARCH
Oldest online log sequence 3188 ------------------------> ( 3432 - 3188 = 244)
Next log sequence to archive 3190
Current log sequence 3190
So, it means that Node1 is busier than Node2?
or maybe node2 declined for a few hours...
Tags: Database
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