Logshipping monitor incorrectly raises error number 14420 instead of 14421 when the secondary database is out of sync


Symptoms


Consider the following configuration of a Log Shipping environment:

  • Server A hosts primary server instance and the database.
  • Server B  hosts secondary server instance and the database.
  • Server C hosts a monitor server instance where in the Log Shipping Monitor job is configured to use an impersonated proxy account  for the connections to Server A and Server B.

When you use this configuration, Log Shipping Monitor job incorrectly raises error message 14420 instead of 14421 when the secondary database is out of sync. The description of these error messages in SQL Server 2005 and SQL Server 2008 is as follows:

Error: 14420, Severity: 16, State: 1
The log shipping primary database %s.%s has backup threshold of %d minutes and has not performed a backup log operation for %d minutes. Check agent log and logshipping monitor information.

Error: 14421, Severity: 16, State: 1
The log shipping secondary database %s.%s has restore threshold of %d minutes and is out of sync. No restore was performed for %d minutes. Restored latency is %d minutes. Check agent log and logshipping monitor information.

The alert message 14221 indicates that the difference between current time (UTC) and the last_restored_date_utc value in the log_shipping_monitor_secondary table on the monitor server is greater than value that is set for the Restore Alert threshold whereas the alert message 14220 indicates that the difference between current time (UTC) and the last_backup_date_utc value in the log_shipping_monitor_primary table on the monitor server is greater than value that is set for the Backup Alert threshold.

Cause


The issue happens because of a problem in the Log Shipping user interface. When creating the monitor job for the secondary, 14220 is passed instead of 14221.

Resolution


To resolve the problem, correct the @threshold_alert parameter value for the secondary database by executing the following statement on the monitor server (Server C)
use master
go
sp_change_log_shipping_secondary_database @secondary_database =  'dbname',  @threshold_alert = 14421

More Information


  • 329133 Description of error message 14420 and error message 14421 that occur when you use log shipping in SQL Server