Oracle DataGuard环境中主库收到ORA

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    客户的一套 Oracle Active DataGuard 环境中，主库在每天的最高峰的时间段内都会收到如下的报错：
Fri Apr 24 17:25:59 2015
ORA-16198: LGWR received timedout error from KSR
LGWR: Attempting destination LOG_ARCHIVE_DEST_2 network reconnect (16198)
LGWR: Destination LOG_ARCHIVE_DEST_2 network reconnect abandoned
Error 16198 for archive log file 1 to afabdg01

参考如下的 MOS 文章：
Redo Transport Services fails with ORA-16198 when using SYNC  (synchronous) mode (Doc ID 808469.1)

In this Document

Symptoms
Cause
Solution
ReferencesApplies to:

Oracle Database – Enterprise Edition – Version 10.2.0.1 and later
Information in this document applies to any platform.
***Checked for relevance on 26-Feb-2014***

This will affect LGWR SYNC transport mode in 10.2.0.x databases and SYNC transport mode in 11.2.0.x databases

Symptoms

Redo Transport Services failed with ORA-16198 from primary database
to either the physical standby database or logical standby database
using LGWR SYNC mode.

The primary alert log file showed:

Fri Feb 6 21:22:26 2009
ORA-16198: LGWR received timedout error from KSR
LGWR: Attempting destination LOG_ARCHIVE_DEST_2 network reconnect (16198)
LGWR: Destination LOG_ARCHIVE_DEST_2 network reconnect abandoned
Fri Feb 6 21:22:26 2009
Errors in file /u01/app/oracle/admin/crthpd01/bdump/crthpd01_lgwr_2793488.trc:
ORA-16198: Timeout incurred on internal channel during remote archival
LGWR: Network asynch I/O wait error 16198 log 2 service
(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=tcp)(HOST=abc)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=xyz_STANDBY_XPT.world)(INSTANCE_NAME=xyz)(SERVER=dedicated)))
Fri Feb 6 21:22:26 2009
Destination LOG_ARCHIVE_DEST_2 is UNSYNCHRONIZED
LGWR: Failed to archive log 2 thread 1 sequence 628 (16198)
Fri Feb 6 21:22:27 2009

If you use Data Guard Broker, then the primary drc log showed:

DG 2009-04-12-12:11:08 0 2 678445059 Operation CTL_GET_STATUS cancelled during phase 2, error = ORA-16778
DG 2009-04-12-12:12:08 0 2 0 RSM detected log transport problem: log
transport for database xyz_STANDBY has the following error.
DG 2009-04-12-12:12:08 0 2 0 ORA-16198: Timeout incurred on internal channel during remote archival
DG 2009-04-12-12:12:08 0 2 0 RSM0: HEALTH CHECK ERROR: ORA-16737: the
redo transport service for standby database xyz_STANDBY has an error
DG 2009-04-12-12:12:08 0 2 678445062 Operation CTL_GET_STATUS cancelled during phase 2, error = ORA-16778
DG 2009-04-12-12:12:08 0 2 678445062 Operation CTL_GET_STATUS cancelled during phase 2, error = ORA-16778

Cause

The NET_TIMEOUT attribute in the LOG_ARCHIVE_DEST_2 on the primary is set too low so that
LNS couldn t finish sending redo block in 10 seconds in this example.

log_archive_dest_2 service= (DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PR
OTOCOL=tcp)(HOST=abc)(PORT=1521)))(CONNECT
_DATA=(SERVICE_NAME=xyz_STANDBY_XPT.world)(
INSTANCE_NAME=xyz)(SERVER=dedicated))) ,
LGWR SYNC AFFIRM delay=0 OPTIONAL max_failure=0
max_connections=1 reopen=300 db_unique_name=
xyz_STANDBY register net_timeout=10 valid
_for=(online_logfile,primary_role)

Noticed that you used LGWR SYNC log transport mode and NET_TIMEOUT was set to 10 .

Solution

You ll need to increase the NET_TIMEOUT value in the
LOG_ARCHIVE_DEST_2 on the primary to at least 15 to 20 seconds depends
on your network speed.

If you don t use Data Guard Broker, then you could change
LOG_ARCHIVE_DEST_2 from SQL*Plus using ALTER SYSTEM command. For
example,

SQL ALTER SYSTEM SET LOG_ARCHIVE_DEST_2 SERVICE=xyz_STANDBY
LGWR SYNC DB_UNIQUE_NAME=xyz_STANDBY NET_TIMEOUT=30 VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)

If you use Data Guard Broker, then you will need to modify NetTimeout property from DGMGRL or Grid Control.

For example, connect to the DGMGRL command-line interface from the primary machine,

DGMGRL connect sys/ sys password

DGMGRL EDIT DATABASE primary db_unique_name SET PROPERTY NetTimeout = 30;

=======================================================================

Note: If NET_TIMEOUT attribute has already been set to 30, and you still get ORA-16198, that means

LNS couldn t finish sending redo block in 30 seconds.

The slowness may caused by:

1. Operating System. Please keep track of OS usage (like iostat).

2. Network. Please keep track network flow (like tcpdump).

Note: Please don t use SYNC log transport mode across a wide area network (WAN) with latencies above 10ms.

 The purpose here is to figure out if the slowness is caused by temporary OS glitch or temporary network glitch. 

    出现这个报错是由于在默认的 NET_TIMEOUT 时间（10 秒）内主库 LGWR 进程没有将数据完整的发送到备库，可以将 NET_TIMEOUT 设置为 15 或者 30 秒来增加 LGWR 发送数据到备库的时间，减少出现这个问题的几率。如果 NET_TIMEOUT 设置为 30 秒仍然存在此问题，那么就需要考虑是否是主库到备库的网络存在性能问题或存在一定的故障，对于 WAN 外网的 Standby 数据库最好不要使用 LGWR SYNC 进行实时同步，使用 ARC NSYNC 同步更合适。

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