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一、环境
12c ADG环境
在延平等地区，都构建了全面的区域性战略布局，加强发展的系统性、市场前瞻性、产品创新能力，以专注、极致的服务理念，为客户提供做网站、成都网站设计 网站设计制作按需设计网站,公司网站建设,企业网站建设,品牌网站建设,全网营销推广,外贸网站建设,延平网站建设费用合理。
二、现象描述
主库日志切换卡住（hang）
SQL> alter system switch logfile;三、处理过程
1、查看日志
$tail -f al*.log
Mon Jan 08 21:04:20 2018
ARC0: LGWR is scheduled to archive destination LOG_ARCHIVE_DEST_1 after log switch
Mon Jan 08 21:11:21 2018
ARC3: LGWR is scheduled to archive destination LOG_ARCHIVE_DEST_1 after log switch
Mon Jan 08 21:19:21 2018
ARC0: LGWR is scheduled to archive destination LOG_ARCHIVE_DEST_1 after log switch
Mon Jan 08 21:26:22 2018
ARC3: LGWR is scheduled to archive destination LOG_ARCHIVE_DEST_1 after log switch
Mon Jan 08 21:34:22 2018
ARC0: LGWR is scheduled to archive destination LOG_ARCHIVE_DEST_1 after log switch
Mon Jan 08 21:42:19 2018
ARC0: LGWR is scheduled to archive destination LOG_ARCHIVE_DEST_1 after log switch
2、考虑归档参数
SQL> show parameter log_archive_dest
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest string
log_archive_dest_1 string service="orcl", SYNC AFFIRM de
lay=0 optional compression=dis
able max_failure=0 max_connect
ions=1 reopen=300 db_unique_na
me="orcl" net_timeout=10, vali
d_for=(online_logfile,all_role
s)
log_archive_dest_10 string
log_archive_dest_11 string
log_archive_dest_12 string
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_13 string
log_archive_dest_14 string
log_archive_dest_15 string
log_archive_dest_16 string
log_archive_dest_17 string
log_archive_dest_18 string
log_archive_dest_19 string
log_archive_dest_2 string location="+DATADG/arch", vali
d_for=(STANDBY_LOGFILE,STANDBY
_ROLE)3、参数明显有问题,另开一个会话
SQL> ALTER SYSTEM SET log_archive_dest_2='location="+DATADG/arch", valid_for=(ALL_LOGFILES,ALL_ROLES)';
System altered.
SQL> 4、查看主库日志
ALTER SYSTEM SET log_archive_dest_2='location="+DATADG/arch", valid_for=(ALL_LOGFILES,ALL_ROLES)' SCOPE=BOTH;
Mon Jan 08 21:49:23 2018
Archived Log entry 376 added for thread 1 sequence 365 ID 0x58e622f8 dest 2:
krse_arc_driver_core: Successful archiving of previously failed ORL
Mon Jan 08 21:49:23 2018
******************************************************************
LGWR: Setting 'active' archival for destination LOG_ARCHIVE_DEST_1
******************************************************************
Mon Jan 08 21:49:24 2018
Destination LOG_ARCHIVE_DEST_1 no longer supports SYNCHRONIZATION
Mon Jan 08 21:49:24 2018
Thread 1 advanced to log sequence 368 (LGWR switch)
Current log# 1 seq# 368 mem# 0: +DATADG/ORCLDG/ONLINELOG/group_1.399.962961189
Current log# 1 seq# 368 mem# 1: +DATADG/ORCLDG/ONLINELOG/group_1.402.962961189
Mon Jan 08 21:49:24 2018
Archived Log entry 377 added for thread 1 sequence 366 ID 0x58e622f8 dest 2:
Mon Jan 08 21:49:24 2018
Archived Log entry 378 added for thread 1 sequence 367 ID 0x58e622f8 dest 2:
Mon Jan 08 21:49:48 2018
Destination LOG_ARCHIVE_DEST_1 is SYNCHRONIZED
Mon Jan 08 21:49:49 2018
Destination LOG_ARCHIVE_DEST_1 no longer supports SYNCHRONIZATION
Mon Jan 08 21:49:49 2018
Thread 1 advanced to log sequence 369 (LGWR switch)
Current log# 2 seq# 369 mem# 0: +DATADG/ORCLDG/ONLINELOG/group_2.401.962961191
Current log# 2 seq# 369 mem# 1: +DATADG/ORCLDG/ONLINELOG/group_2.404.962961191
Mon Jan 08 21:49:49 2018
Archived Log entry 383 added for thread 1 sequence 368 ID 0x58e622f8 dest 2:5、小结
要理解本地归档路径参数的具体含义
