DataGuard main and backup archives exist gap processing method

http://blog.chinaunix.net/uid-23284114-id-4190413.html

 

  

Due to network and other reasons, the archive logs between the standby database and the active database may be inconsistent between DataGuard's active and standby devices, which results in gap.
Steps to solve the gap:
1. Obtain the detailed information of the gap in the standby database
2. Copy the required archive logs from the main database to the standby database
3. Register the archive logs in the standby database, and then apply.
 
--Alert log prompts gap details in the backup log  
Media Recovery Waiting for thread 1 sequence 7057
Fetching gap sequence in thread 1, gap sequence 7057-7080
FAL [client]: Error fetching gap sequence, no FAL server specified
Mon Mar 24 11:39: 40 CST 2014
FAL [client]: Failed to request gap sequence 
 GAP-thread 1 sequence 7057-7080
 DBID 768411208 branch 784810891
FAL [client]: All defined FAL servers have been attempted.

-You can also query gap
select * from the standby database v $ archive_gap; --Assemble

copy statements for convenience
--If the archive log is in ASM, first copy the archive log to the OS through rman, and then scp to the standby archive directory of the standby database; --If the
archive log is on the OS, directly scp to the standby archive directory of the standby database.
@Pirmary
select length ('+ DG1 / primary / archivelog / 2014_03_21 /') from dual;
LENGTH ('+ DG1 / PRIMARY / ARCHIVELOG / 2014_03_21 /')
---------------- -----------------------------
                                           35
  
--get copy command
select 'copy archivelog' '' || NAME || '' ' to '' / tmp / '|| substr (name, 35) ||' ''; ' 
from v $ archived_log 
where SEQUENCE #> 7060 
and SEQUENCE # <= 7080 
and thread # = 1 
and NAME <>' standby service name ';



copy archivelog '+DG1/primary/archivelog/2014_03_21/thread_1_seq_7061.393.842805877' to '/tmp/thread_1_seq_7061.393.842805877' ;
copy archivelog '+DG1/primary/archivelog/2014_03_21/thread_1_seq_7062.472.842816319' to '/tmp/thread_1_seq_7062.472.842816319' ;
copy archivelog '+DG1/primary/archivelog/2014_03_21/thread_1_seq_7063.414.842825435' to '/tmp/thread_1_seq_7063.414.842825435' ;
copy archivelog '+DG1/primary/archivelog/2014_03_22/thread_1_seq_7064.308.842843087' to '/tmp/thread_1_seq_7064.308.842843087' ;
copy archivelog '+DG1/primary/archivelog/2014_03_22/thread_1_seq_7065.278.842847011' to '/tmp/thread_1_seq_7065.278.842847011' ;
copy archivelog '+DG1/primary/archivelog/2014_03_22/thread_1_seq_7066.415.842847023' to '/tmp/thread_1_seq_7066.415.842847023' ;
copy archivelog '+DG1/primary/archivelog/2014_03_22/thread_1_seq_7067.469.842850077' to '/tmp/thread_1_seq_7067.469.842850077' ;
copy archivelog '+DG1/primary/archivelog/2014_03_22/thread_1_seq_7068.402.842864915' to '/tmp/thread_1_seq_7068.402.842864915' ;
copy archivelog '+DG1/primary/archivelog/2014_03_22/thread_1_seq_7069.475.842868603' to '/tmp/thread_1_seq_7069.475.842868603' ;
copy archivelog '+DG1/primary/archivelog/2014_03_22/thread_1_seq_7070.413.842869761' to '/tmp/thread_1_seq_7070.413.842869761' ;
copy archivelog '+DG1/primary/archivelog/2014_03_22/thread_1_seq_7071.312.842871319' to '/tmp/thread_1_seq_7071.312.842871319' ;
copy archivelog '+DG1/primary/archivelog/2014_03_22/thread_1_seq_7072.407.842874331' to '/tmp/thread_1_seq_7072.407.842874331' ;
copy archivelog '+DG1/primary/archivelog/2014_03_22/thread_1_seq_7073.405.842874917' to '/tmp/thread_1_seq_7073.405.842874917' ;
copy archivelog '+DG1/primary/archivelog/2014_03_22/thread_1_seq_7074.328.842875663' to '/tmp/thread_1_seq_7074.328.842875663' ;
copy archivelog '+DG1/primary/archivelog/2014_03_22/thread_1_seq_7075.296.842876043' to '/tmp/thread_1_seq_7075.296.842876043' ;
copy archivelog '+DG1/primary/archivelog/2014_03_22/thread_1_seq_7076.452.842886921' to '/tmp/thread_1_seq_7076.452.842886921' ;
copy archivelog '+DG1/primary/archivelog/2014_03_22/thread_1_seq_7077.446.842906131' to '/tmp/thread_1_seq_7077.446.842906131' ;
copy archivelog '+DG1/primary/archivelog/2014_03_23/thread_1_seq_7078.348.842928271' to '/tmp/thread_1_seq_7078.348.842928271' ;
copy archivelog '+DG1/primary/archivelog/2014_03_23/thread_1_seq_7079.347.842928277' to '/tmp/thread_1_seq_7079.347.842928277' ;
copy archivelog '+DG1/primary/archivelog/2014_03_23/thread_1_seq_7080.367.842929387' to '/tmp/thread_1_seq_7080.367.842929387' ;


--send archive logs to standby
scp thread_1_seq_70* 10.1.1.10:/tmp

--get  standby register archivelog command
--同样在主库执行，获得注册语句
select 'ALTER DATABASE REGISTER PHYSICAL LOGFILE ''/tmp/'||substr(name,35)||''';' from v$archived_log where  SEQUENCE#>7060 and SEQUENCE#<=7080 and thread#=1 and NAME<>'standby service name';

ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7061.393.842805877';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7062.472.842816319';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7063.414.842825435';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7064.308.842843087';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7065.278.842847011';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7066.415.842847023';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7067.469.842850077';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7068.402.842864915';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7069.475.842868603';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7070.413.842869761';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7071.312.842871319';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7072.407.842874331';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7073.405.842874917';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7074.328.842875663';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7075.296.842876043';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7076.452.842886921';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7077.446.842906131';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7078.348.842928271';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7079.347.842928277';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7080.367.842929387';



@Standby
--register gap archivelog to standby
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7061.393.842805877';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7062.472.842816319';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7063.414.842825435';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7064.308.842843087';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7065.278.842847011';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7066.415.842847023';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7067.469.842850077';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7068.402.842864915';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7069.475.842868603';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7070.413.842869761';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7071.312.842871319';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7072.407.842874331';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7073.405.842874917';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7074.328.842875663';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7075.296.842876043';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7076.452.842886921';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7077.446.842906131';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7078.348.842928271';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7079.347.842928277';
ALTER DATABASE REGISTER PHYSICAL LOGFILE '/tmp/thread_1_seq_7080.367.842929387';

--if standby is real apply,then standby will AUTO Apply archivelog
--if not,please open real apply 
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION;

--get real apply info
set linesize 200
col name for a70
alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
select  NAME,THREAD#,FIRST_TIME,sequence#,applied from v$archived_log order by  FIRST_TIME,THREAD#,sequence#,DEST_ID;

--you can see alert log ,it also show archivelog apply info
tail -f alert.log

--make sure no gap between Primary and Standby
SQL> select * from v$archive_gap;

--Clean
@Priamry
cd /tmp
rm thread_*

RMAN> crosscheck archivelog all;
RMAN> list archivelog all;
RMAN> delete expired archivelog all;