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Applies to: 
SQL Server
Closes the current SQL Server Agent error log file and cycles the SQL Server Agent error log extension numbers just like a server restart. The new SQL Server Agent error log contains a line indicating that the new log was created.
Transact-SQL syntax conventions
Syntax
sp_cycle_agent_errorlog
[ ; ]
Arguments
None.
Return code values
0 (success) or 1 (failure).
Result set
None.
Remarks
Every time SQL Server Agent is started, the current SQL Server Agent error log is renamed to SQLAgent.1; SQLAgent.1 becomes SQLAgent.2, SQLAgent.2 becomes SQLAgent.3, and so on. sp_cycle_agent_errorlog enables you to cycle the error log files without stopping and starting the server.
This stored procedure must be run from the msdb database.
Permissions
Execute permissions for sp_cycle_agent_errorlog are restricted to members of the sysadmin fixed server role.
Examples
The following example cycles the SQL Server Agent error log.
USE msdb;
GO
EXECUTE dbo.sp_cycle_agent_errorlog;
GO