How to read SQL Server ERROR LOG?

To read error logs in SQL Server using T-SQL you can use extended stored procedure xp_ReadErrorLog to read SQL Server and SQL Server Agent error logs. xp_ReadErrorLog has seven parameters that can be used to filter error logs.

Syntax for xp_ReadErrorLog:

EXEC xp_ReadErrorLog    <LogNumber>, <LogType>,
                        <SearchTerm1>, <SearchTerm2>,
                        <StartDate>, <EndDate>, <SortOrder>

The parameter values can be as follows:
1. Value of error log file you want to read: 0 = current, 1 = Archive #1, 2 = Archive #2, etc…
2. Log file type: 1 or NULL = error log, 2 = SQL Agent log
3. Search string 1: String one you want to search for
4. Search string 2: String two you want to search for to further refine the results
5. Search from start time
6. Search to end time
7. Sort order for results: N’asc’ = ascending, N’desc’ = descending

You can use the stored procedure as:

EXEC xp_ReadErrorLog
– Reads current SQL Server error log

How to read SQL Server ERROR LOG?

Below are some more examples of xp_ReadErrorLog:

EXEC xp_ReadErrorLog 1
– Reads SQL Server error log from ERRORLOG.1 file

EXEC xp_ReadErrorLog 0, 1
– Reads current SQL Server error log

EXEC xp_ReadErrorLog 0, 2
– Reads current SQL Server Agent error log

EXEC xp_ReadErrorLog 0, 1, ‘Failed’
– Reads current SQL Server error log with text ‘Failed’

EXEC xp_ReadErrorLog 0, 1, ‘Failed’, ‘Login’
– Reads current SQL Server error log with text ‘Failed’ AND ‘Login’

EXEC xp_ReadErrorLog 0, 1, ‘Failed’, ‘Login’, ‘20121101’, NULL
– Reads current SQL Server error log with text ‘Failed’ AND ‘Login’ from 01-Nov-2012

EXEC xp_ReadErrorLog 0, 1, ‘Failed’, ‘Login’, ‘20121101’, ‘20121130’
– Reads current SQL Server error log with text ‘Failed’ AND ‘Login’ between 01-Nov-2012 and 30-Nov-2012

EXEC xp_ReadErrorLog 0, 1, NULL, NULL, ‘20121101’, ‘20121130’
– Reads current SQL Server error between 01-Nov-2012 and 30-Nov-2012

EXEC xp_ReadErrorLog 0, 1, NULL, NULL, ‘20121101’, ‘20121130’, ‘DESC’
– Reads current SQL Server error log between 01-Nov-2012 and 30-Nov-2012 and sorts in descending order.

 


 

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