os: centos 7.6
db: oracle 19.3

oracle active dataguard 环境,通过 dgmgrl 设置一个 standby 的 delay 为120后,执行 show configuration verbose 出现 Warning: ORA-16853: apply lag has exceeded specified threshold

edit database orcls2 set property DelayMins=

DGMGRL> edit database orcls2 set property DelayMins=120;

DelayMins 的单位是分钟

在这里插入图片描述

show configuration verbose

DGMGRL> show configuration verbose;

Configuration - dgconf

  Protection Mode: MaxPerformance
  Members:
  orclp  - Primary database
    orcls1 - Physical standby database 
    orcls2 - Physical standby database 
      Warning: ORA-16853: apply lag has exceeded specified threshold

  Properties:
    FastStartFailoverThreshold      = '30'
    OperationTimeout                = '30'
    TraceLevel                      = 'USER'
    FastStartFailoverLagLimit       = '30'
    CommunicationTimeout            = '180'
    ObserverReconnect               = '0'
    FastStartFailoverAutoReinstate  = 'TRUE'
    FastStartFailoverPmyShutdown    = 'TRUE'
    BystandersFollowRoleChange      = 'ALL'
    ObserverOverride                = 'FALSE'
    ExternalDestination1            = ''
    ExternalDestination2            = ''
    PrimaryLostWriteAction          = 'CONTINUE'
    ConfigurationWideServiceName    = 'orcl0_CFG'

Fast-Start Failover:  Disabled

Configuration Status:
WARNING

edit database orcls2 set property ApplyLagThreshold=

$ oerr ora 16853
16853,0000, "apply lag has exceeded specified threshold"
// *Cause:  The current apply lag exceeded the value specified by the
//          ApplyLagThreshold configurable property. It may be caused either by
//          a large transport lag or poor performance of apply services on the 
//          standby database.
// *Action: Check for gaps on the standby database. If no gap is present, tune
//          the apply services.

说是需要修改参数 ApplyLagThreshold ,单位是秒
在这里插入图片描述

DGMGRL> edit database orcls2 set property ApplyLagThreshold=7500;

DGMGRL> show configuration verbose;
DGMGRL> show database verbose orcls2;

均没有告警出现

相关的 Threshold 参数还有几个
The Data Guard broker also has configurable database properties that can be used to generate warnings when a transport or apply lag exceed a user defined value:

The ApplyLagThreshold configurable database property generates a warning status for a logical or physical standby when the database’s apply lag exceeds the value specified by the property. The property value is expressed in seconds. A value of 0 seconds results in no warnings being generated when an apply lag exists. As a best practice, Oracle recommends setting ApplyLagThreshold to at least 15 minutes.

The TransportLagThreshold configurable database property can be used to generate a warning status for a logical, physical, or snapshot standby when the database’s transport lag exceeds the value specified by the property. The property value is expressed in seconds. A value of 0 seconds results in no warnings being generated when a transport lag exists. As a best practice, Oracle recommends setting TransportLagThreshold to at least 15 minutes.

参考:
https://docs.oracle.com/en/database/oracle/oracle-database/19/dgbkr/oracle-data-guard-broker-properties.html#GUID-EA462D3D-F2B2-4307-84BE-992F2DA06C17
https://docs.oracle.com/en/database/oracle/oracle-database/19/dgbkr/oracle-data-guard-broker-properties.html#GUID-F19B0F98-4DF6-42AB-8CDF-5E04204D1FA3
https://docs.oracle.com/en/database/oracle/oracle-database/19/dgbkr/oracle-data-guard-broker-properties.html#GUID-71AFB06B-6872-47DE-B691-4572E02C8A45

<<Monitoring a Data Guard Configuration (文档 ID 2064281.1)>>
https://support.oracle.com/epmos/faces/SearchDocDisplay?_adf.ctrl-state=lqtd87u94_14&_afrLoop=231724388705532#aref_section22

Warning: ORA-16853: apply lag has exceeded specified threshold

edit database orcls2 set property DelayMins=

show configuration verbose

edit database orcls2 set property ApplyLagThreshold=

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