Ensure 'Maximum number of error log files' is set to greater than or equal to '12'

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Descripción

SQL Server error log files must be protected from loss. The log files must be backed up before they are overwritten. Retaining more error logs helps prevent loss from frequent recycling before backups can occur. Follows the benchmark T-SQL method: NumErrorLogs >= 12, or -1 (registry value absent) is accepted as the benchmark states; note that an absent value means SQL Server keeps its default of 6 logs, so set the value explicitly. Default: 6 SQL Server error log files in addition to the current error log file are retained by default. Runs one sqlcmd query with its defaults (Windows authentication to the local default instance); set SQLCMDSERVER, SQLCMDUSER and SQLCMDPASSWORD for another instance or SQL authentication. Needs VIEW SERVER STATE / sysadmin-level read access.

Cómo se verifica

Método de auditoría: Consulta SQL

sql_query

sqlcmd -b -h -1 -W -Q "SET NOCOUNT ON; DECLARE @n int; EXEC master.sys.xp_instance_regread N'HKEY_LOCAL_MACHINE', N'Software\Microsoft\MSSQLServer\MSSQLServer', N'NumErrorLogs', @n OUTPUT; SELECT CASE WHEN ISNULL(@n, -1) = -1 OR @n >= 12 THEN 'compliant' ELSE 'noncompliant' END;"

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Adjust the number of logs to prevent data loss. The default value of 6 may be insufficient for a production environment. Perform either the GUI or T-SQL method shown: GUI Method 1. Open SQL Server Management Studio. 2. Open Object Explorer and connect to the target instance. 3. Navigate to the Management tab in Object Explorer and expand. Right click on the SQL Server Logs file and select Configure 4. Check the Limit the number of error log files before they are recycled 5. Set the Maximum number of error log files to greater than or equal to 12 T-SQL Method Run the following T-SQL to change the number of error log files, replace <NumberGreaterThan11> with your desired number of error log files: EXEC master.sys.xp_instance_regwrite N'HKEY_LOCAL_MACHINE', N'Software\Microsoft\MSSQLServer\MSSQLServer', N'NumErrorLogs', REG_DWORD, <NumberGreaterThan11>;

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: mssqldatabaselogging
Referencia: CIS Microsoft SQL Server 2025 Benchmark v1.0.0 - 5.1 Ensure 'Maximum number of error log files' is set to greater than or equal to '12'

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shell

tmaegis scan --target mssql