本文主要是介绍DataGuard主备之间解决gap的步骤，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
DataGuard主备之间可能由于网络等原因，造成备库和主库之间的归档日志不一致，这样就产生了gap。解决gap的步骤：
1.在备库获得gap的详细信息
2.将需要的归档日志从主库拷贝到备库
3.备库将归档日志注册，然后应用。
--备库alert日志提示gap详情
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.
--也可以在备库查询gap
select * from v$archive_gap;
--为了方便，组装拷贝语句
--如果归档日志在ASM中，先通过rman将归档日志拷贝到OS，然后scp到备库standby归档目录；
--如果归档日志在OS上，直接scp到备库standby归档目录即可。
@Pirmary
select length('+DG1/primary/archivelog/2014_03_21/') from dual;
LENGTH('+DG1/PRIMARY/ARCHIVELOG/2014_03_21/')
---------------------------------------------
35
--get copy command
select 'copy archivelog '''||NAME||''' to ''/tmp/'||substr(name,35)||''' ;'
from v$archived_log
where SEQUENCE#>7060
and SEQUENCE#<=7080
and thread#=1
and NAME<>'standby service name';
--copy archive logs from asm to OS
rman target /
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;
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