Sql error log path

Sql error log path

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Question

Where do I find SQL Server Error Log and windows Eventlog. what is the path,? Thanks.

Answers

For SQL server error logs :-

Location of SQL server error logs can changes as per versions or installation directory. Execute SP_readerrorlog store procedure in query windows & check in first 10 lines for messages starting from «Logging SQL Server messages in file» follwed by current error log location.

Like : «Logging SQL Server messages in file ‘C:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\Log\ERRORLOG’.»

For Windowss Error Logs :-

Go to Run > eventvwr.msc > Click Ok > Windows event log opens

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How to see log files in MySQL?

I’ve read that Mysql server creates a log file where it keeps a record of all activities — like when and what queries execute.

Can anybody tell me where it exists in my system? How can I read it?

Basically, I need to back up the database with different input [backup between two dates] so I think I need to use log file here, that’s why I want to do it.

I think this log must be secured somehow because sensitive information such as usernames and password may be logged [if any query require this]; so may it be secured, not easily able to be seen?

I have root access to the system, how can I see the log?

When I try to open /var/log/mysql.log it is empty.

This is my config file:

9 Answers 9

Here is a simple way to enable them. In mysql we need to see often 3 logs which are mostly needed during any project development.

The Error Log . It contains information about errors that occur while the server is running (also server start and stop)

The General Query Log . This is a general record of what mysqld is doing (connect, disconnect, queries)

The Slow Query Log . Ιt consists of «slow» SQL statements (as indicated by its name).

By default no log files are enabled in MYSQL. All errors will be shown in the syslog ( /var/log/syslog ).

To Enable them just follow below steps:

step1: Go to this file (/etc/mysql/conf.d/mysqld_safe_syslog.cnf) and remove or comment those line.

step2: Go to mysql conf file ( /etc/mysql/my.cnf ) and add following lines

To enable error log add following

To enable general query log add following

To enable Slow Query Log add following

step3: save the file and restart mysql using following commands

To enable logs at runtime, login to mysql client ( mysql -u root -p ) and give:

Finally one thing I would like to mention here is I read this from a blog. Thanks. It works for me.

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How to Open, Read & Check MS SQL Error Log File – Ultimate Tutorial

Modified: August 11th, 2022

5 Minutes Reading

This blog gives you a big picture of SQL Server Error Log file and where it is located in the system. So, let’s have a deeper look of it.

The SQL Server Error Log sounds like Transaction Log, which keeps a record of database transactions and ensures database integrity. Right?

Unfortunately, Error Log file is not like that.

SQL Error Log files are very much different from SQL Server LDF. It majorly comprises User-defined events and used to troubleshoot system problems. In this technical guide, we are going to provide complete information about Microsoft SQL Server Error Log File.

Let’s get started!

Topics To Be Covered

What Inside a Error Log file of SQL Server ?

It comprises information regarding the Audit Collection, Database Mail, Windows Events, SQL Server Agent, SQL Server, Job History, Data Collection. Moreover, it shows a summary report that use to analyze which activities took place in SSMS. So, it can easily troubleshoot by the user.

Where is MS SQL Server Error Log Stored?

You can easily find the SQL Error Log location for your dedicated SQL Server version. All you need to use the following path to access it.

Drive:\ Program Files \ Microsoft SQL Server \ MSSQLV.SQLEXPRESS \ MSSQL \ Log \ ERRORLOG

It is a general path that provides you SQL Server 2017 / 2016 / 2014 / 2012 / 2008 / 2008 R2 / 2005 error log file location. For example, it is the SQL Server 2016 Error Log file location in Windows 10.

C:\ Program Files \ Microsoft SQL Server \ MSSQL13.SQLEXPRESS \ MSSQL \ Log

How to Change Error Log File Location in MS SQL Server 2017/ 2016/ 2014/ 2012

Sometime SQL users need to update the path of an SQL Error log file. The overall procedure is classified into two stages.

Stage 1: Start the SQL Server Configuration Manager

One can open the Configuration Manager with different techniques. All of them are mentioned below.

Method #1 – To open Configuration Manager, you can type the SQL Server Configuration Manager in the search box of Start and open it as shown in the screenshot.

Method #2 – Else, you can use the following path to open SQL Server Configuration Manager.

SQL Server Version	SQL Server Configuration Manager Exe Location
SQL Server 2017	C:\ Windows \ System32 \ SQLServerManager14.msc
SQL Server 2016	C:\ Windows \ System32 \ SQLServerManager13.msc
SQL Server 2014	C:\ Windows \ System32 \ SQLServerManager12.msc
SQL Server 2012	C:\ Windows \ System32 \ SQLServerManager11.msc
SQL Server 2008	C:\ Windows \ System32 \ SQLServerManager10.msc

Here, we opened the SQL Server Configuration Configuration Manager with the above – mentioned location in SQL Server 2017.

Method #3 – You can also open the Run dialog box and type ‘compmgmt.msc’ in the box.

From the following screen, expand the Services and Applications section and get the SQL Server Configuration Manager.

Stage 2: Change the SQL Server Error Log Path

Step 1: Under the SQL Server Configuration Manager, go to the SQL Server Services option.

Step 2: Perform right-click on SQL Server(SQLEXPRESS) as shown in the screenshot and choose the Properties option.

Step 3: From the SQL Server(SQLEXPRESS) Properties, click on the Startup Parameters tab. Afterward, under the Existing parameters section, choose the log file whose location you want to change.

Step 4: The starting prefix (like e,d) and the current Error Log file Name will not change. Rest of the folder can be changed. Mention the new path under the Specify a startup parameter box and update it.

Step 5: The changes to SQL error logs location are saved but they are not active. For this. You need to start the SQL Server Services.

Methods to Open SQL Server Error Log files

There are two ways through which one can view the Error Log. Now, whenever, the SQL Server could not open Error Log file, then use any of the below-mentioned technique.

Approach #1: Use T-SQL to Read SQL Error Log

Connect with the SSMS and type ‘sp_readererrorlog’ in the panel. It is a SQL Server query to read Error Log.

Approach #2: Use Object Explorer Option

Without the help of T-SQL, you can also view the error log. Moreover, if you want to examine the SQL Transaction Log file, then you can try SysTools LDF File Reader Software. Let’s check out how to read SQL Server Error Log.

Step 1: Open Microsoft SQL Server Management Studio on your system.

Step 2: Time to connect with Object Explorer. Open Connect to Server Window and select the Server name. Afterward, choose the Authentication Type and click on Connect.

Step 3: Go to the Management section from the Object Explorer in order to read SQL Error Log.

Step 4: Expand the Management Section and go to the SQL Server Logs.

Step 5: Right-click on SQL Server Logs option. Go to the View option and select SQL Server Log from the menu.

Step 6: The Log File Summary will appear on the screen. From the same window, you can opt for different Log – SQL Server Agent, Database Mail.

That’s all about Microsoft SQL Server Error Log.

Frequently Asked Questions –

The location of Error Log – C:\ Program Files \ Microsoft SQL Server \ MSSQLn.SQLEXPRESS \ MSSQL \ Log , where n is equivalent to number basis on SQL Server version.

Open ErrorLog using Log File Viewer in Management Studio and analyze all the events happened in the system.

The SQL Log or Transaction Log file keeps record of every transaction performed on the database. Whereas, the Error Log used to keep track of events happened in SSMS related to ports, network and much more.

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SqlHints.com

By Basavaraj Biradar

How to change Sql Server ErrorLog files location

By default Sql Server ErrorLog files are located in the same drive/path which is used/selected during Sql Server Installation. You may like to store Sql Server Error log files in a drive or path which is other than the one used for Sql Server installation, to avoid filling up of that particular drive. To change the Sql Server ErrorLog files location you may like to follow the following steps:

[ALSO READ] How to find the location of the Sql Server Error Log File
STEP I: Open the Sql Server Configuration Manager

Go to Sql Server Configuration Manager as shown in the below image:

Alternatively, you can go to the Sql Server Configuration Manager exe location as listed in the below table and then double click on it.

STEP II: Change the Sql Server Error Log Path

Once the Sql Server Configuration Manager is opened, then follow the Steps in the Sequence as listed in the below image to change the Sql Server Error logs Path.

Below is the description of each of the sequence of steps which we need to follow in the Sql Server Configuration manager to change the Sql Server Error Log files location.

1. Select the Sql Server Services in the left pane of the Sql Server Configuration Manager
2. In the right pane right click on the Sql Server Instance Service and in the context menu click on the Properties option.
3. In the properties window, select the Startup Parameters tab
4. Then in the Existing parameters list, select the entry which is pre-fixed with -e in my instance this entry is as below:
   -eC:\Program Files\Microsoft SQL Server\MSSQL11.SQL2012\MSSQL\Log\ERRORLOG
   The path after the prefix character -e is the current error logs path.

Below image explains parts of the Sql Servers error log Startup Parameter:

Change the path to the desired location. In this case I am changing the current Error Logs location to -eD:\SqlLog\Errors\ERRORLOG. And then click the update button to update the error logs location.

Then click Apply

And finally click Ok

Step III: Re-Start the Sql Server Service

Now the changes to the error logs location are saved but they are not still-in effect. If you want these changes to take effect, you need to restart the Sql Server Service.

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SqlHints.com

By Basavaraj Biradar

How to find the location of the Sql Server Error Log File

Sql Server Error Log is very helpful to diagnose and troubleshoot problems. Error log files contain user-defined events and certain system events, which are very helpful for troubleshooting.

In this article, I will explain various alternative approaches to find the location of the Sql Server Error Log file.

Approach 1: Identify Sql Server Error Log file location using SERVERPROPERTY function

If you are able to connect to the Sql Server, then you can use the SERVERPROPERTY function as shown below to find the location of the Sql Server ERRORLOG file:

RESULT:

Below image shows the Sql Server ErrorLog folder with error log files. Here ERRORLOG is the current error log file and remaining six files are the archived SQL Server Error Logs. By default sql server maintains six archived Error log files.

[ALSO READ] How to change Sql Server ErrorLog files location

Approach 2: Finding Sql Server Error Log file location using system stored procedure SP_READERRORLOG

This is one more option to find the location of the Sql Server Error Log file, if you are able to connect to the Sql Server. This system stored procedure can be used to view the content of the Error Log file. The information about the Sql Server ErrorLog file location will be present in the first couple of rows in this sp’s result as shown below

RESULT:

If you don’t want to search the location of the error log file in the result of this SP. Then you can execute the stored procedure SP_READERRORLOG with the optional parameters values as shown below to get the Sql Server Error log file location:

RESULT:

This stored procedure takes four parameters and below is the description for each of these parameters:

Parameter 1: The log file which you want to read. Value 0 means current Error log file, 1 means the Archived Error log file ERRORLOG.1, 2 means the Archived Error log file ERRORLOG.2 and so.on.
Parameter 2: This parameter specifies whether you want to read Sql Server Error Log file or Sql Server Agent Log file. This parameter value 1/NULL means Sql Server error log file, 2 means Sql Server Agent log file.
Parameter 3:First string you want to searh in the error log
Parameter 4:Second string you want to search for to further filter the result

Approach 3: Locate Sql Server Log file location using Sql Server Configuration Manager (An option if you are not able to connect to Sql Server)

If you are not able to connect to Sql Server, then this approach will be very hand in identifying the location of the Sql Server Error Log. Go to Sql Server Configuration Manager as shown in the below image:

Alternatively, you can go to the Sql Server Configuration Manager exe location as listed in the below table and then double click on it.

In the Sql Server Configuration Manager as shown in the below image. Select the Sql Server Service and then right click the Sql Server service in the right pan and select the properties option. It will bring-up the Sql Server Service properties dialog, in the dialog go to the Startup Parameters tab. In the Startup Parameter tab, the existing parameter with prefix -e will be the location of the Sql Server Error log (i.e. the path appearing after the prefix parameter -e).

Approach 4: Locate Sql Server ErrorLog file loation using XP_READERRRORLOG extended stored procedure

If you are able to connect to Sql Server, then you can use the extended stored procedure XP_READERRRORLOG to find the location of the Sql Server ErrorLog file location as shown below. By the way the system stored procedure SP_READERRORLOG internally calls this extended stored procedure only.

RESULT:

This extended stored procedure takes seven parameters and below is the description for each of these parameters:

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