Troubleshooting of MySQLTuner: Difference between revisions
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" | "[https://github.com/major/MySQLTuner-perl MySQLTuner] is a script written in Perl that will assist you with your MySQL configuration and make recommendations for increased performance and stability." | ||
__TOC__ | __TOC__ | ||
== How to resolve: | == How to resolve: (Cygwin) couldn't find diagnostic data == | ||
Condition: | Condition: | ||
<pre> | <pre> | ||
| Line 17: | Line 13: | ||
Solution: | Solution: | ||
# Download the installation file {{kbd | key=<nowiki>setup-x86_64.exe</nowiki>}} | # Download the Cygwin installation file {{kbd | key=<nowiki>setup-x86_64.exe</nowiki>}} from [https://cygwin.com/install.html Cygwin Installation] | ||
# | # Install the perl_pods package using either method below: | ||
# | |||
'''Method 1: Using Cygwin Setup Window (GUI)''' | |||
# Double-click {{kbd | key=<nowiki>setup-x86_64.exe</nowiki>}} to launch the setup wizard | |||
# Follow the installation wizard until you reach the "Select Packages" screen | |||
# If the view dropdown shows "Pending", change it to "Full" to see all available packages | |||
# Search for "perl_pods" in the search box | |||
# Click on the "Skip" text next to perl_pods to change it to the version number (this selects it for installation) | |||
# Click "Next" to proceed with the installation | |||
'''Method 2: Using Command Line (CMD)'''<ref>[https://stackoverflow.com/questions/36393757/how-do-i-use-diagnostics-for-perl-on-cygwin cpan - How do I 'use diagnostics' for Perl on Cygwin? - Stack Overflow]</ref><ref>[https://cygwin.com/faq/faq.html#faq.setup.cli Does Setup accept command-line arguments?]</ref> | |||
# Open a command line window | |||
# Navigate to the directory containing {{kbd | key=<nowiki>setup-x86_64.exe</nowiki>}}, for example: {{kbd | key=<nowiki>cd C:\Downloads</nowiki>}}, then press {{kbd | key=<nowiki>Enter</nowiki>}} | |||
# Enter the following command: {{kbd | key=<nowiki>setup-x86_64.exe -q -P "perl_pods"</nowiki>}} | |||
Environment: | Environment: | ||
* Windows 2008 R2 standard | * Windows 2008 R2 standard | ||
* Cygwin version: CYGWIN_NT-6.1 Win2008R2-0-0 2.9.0(0.318/5/3) 2017-09-12 10:18 x86_64 Cygwin (information returned from {{kbd | key=<nowiki>uname -a</nowiki>}}) | * Cygwin version: CYGWIN_NT-6.1 Win2008R2-0-0 2.9.0(0.318/5/3) 2017-09-12 10:18 x86_64 Cygwin (information returned from {{kbd | key=<nowiki>uname -a</nowiki>}}) | ||
== How to resolve: (Cygwin) wget command not found == | |||
Condition: When I tried to download the MySQLTuner using {{kbd | key=<nowiki>wget</nowiki>}} command but met the error. | |||
Solution: | |||
# Download the installation file {{kbd | key=<nowiki>setup-x86_64.exe</nowiki>}} of Cygwin from [https://cygwin.com/install.html Cygwin Installation] | |||
# Open the command line window | |||
# Change to the directory where the file {{kbd | key=<nowiki>setup-x86_64.exe</nowiki>}} located e.g. {{kbd | key=<nowiki>cd C:\Downloads></nowiki>}} and than press the key {{kbd | key=<nowiki>Enter</nowiki>}} | |||
# To install the packages: wget. Keyin {{kbd | key=<nowiki>setup-x86_64.exe -q -P "wget"</nowiki>}} or follow the steps on [https://superuser.com/questions/693284/wget-command-not-working-in-cygwin terminal - WGET Command Not Working in Cygwin - Super User] if you prefer the GUI window. | |||
== How to resolve: (Cygwin) unzip: command not found == | |||
Condition: | |||
<pre> | |||
$ unzip -l sysschema.zip | |||
-bash: unzip: command not found | |||
</pre> | |||
Solution: | |||
# Download the installation file {{kbd | key=<nowiki>setup-x86_64.exe</nowiki>}} of Cygwin from [https://cygwin.com/install.html Cygwin Installation] | |||
# Open the command line window | |||
# Change to the directory where the file {{kbd | key=<nowiki>setup-x86_64.exe</nowiki>}} located e.g. {{kbd | key=<nowiki>cd C:\Downloads></nowiki>}} and than press the key {{kbd | key=<nowiki>Enter</nowiki>}} | |||
# To install the packages: [https://cygwin.com/packages/summary/unzip.html unzip]. Keyin {{kbd | key=<nowiki>setup-x86_64.exe -q -P unzip</nowiki>}} | |||
== How to resolve: Attempted to use login credentials, but they were invalid. == | == How to resolve: Attempted to use login credentials, but they were invalid. == | ||
| Line 40: | Line 71: | ||
* Check the typo of mysql account and password | * Check the typo of mysql account and password | ||
== | == How to resolve: Performance schema should be activated for better diagnostics == | ||
Condition: | |||
<pre> | |||
$ perl mysqltuner.pl | |||
-------- Recommendations --------------------------------------------------------------------------- | |||
General recommendations: | |||
Performance schema should be activated for better diagnostics | |||
</pre> | |||
Solution: | |||
* Verify the MySQL setting. Execute the SQL query {{kbd | key=<nowiki>SHOW VARIABLES LIKE 'performance_schema'</nowiki>}}. The result should be OFF. | |||
* Stop the MySQL service. | |||
* Open the MySQL configuration file named {{kbd | key=<nowiki>my.ini</nowiki>}} on {{Win}} or {{kbd | key=<nowiki>my.cnf</nowiki>}} on {{Linux}} The file maybe located in different path e.g. C:\xampp\mysql\bin\my.ini on {{Win}} | |||
* Edit the MySQL configuration file | |||
<pre> | |||
[mysqld] | |||
performance_schema = ON | |||
</pre> | |||
* Restart the MySQL service. | |||
* Verify the MySQL setting again. Execute the SQL query {{kbd | key=<nowiki>SHOW VARIABLES LIKE 'performance_schema'</nowiki>}}. The result should be ON. | |||
== References == | |||
<references/> | <references/> | ||
Latest revision as of 10:48, 5 November 2025
"MySQLTuner is a script written in Perl that will assist you with your MySQL configuration and make recommendations for increased performance and stability."
How to resolve: (Cygwin) couldn't find diagnostic data[edit]
Condition:
$ perl mysqltuner.pl couldn't find diagnostic data in /usr/share/perl5/5.26/pods/perldiag.pod /usr/local/lib/perl5/site_perl/5.26/x86_64-cygwin-threads /usr/local/share/perl5/site_perl/5.26 /usr/lib/perl5/vendor_perl/5.26/x86_64-cygwin-threads /usr/share/perl5/vendor_perl/5.26 /usr/lib/perl5/5.26/x86_64-cygwin-threads /usr/share/perl5/5.26 mysqltuner.pl at /usr/share/perl5/5.26/diagnostics.pm line 259, <POD_DIAG> line 711. Compilation failed in require at mysqltuner.pl line 45. BEGIN failed--compilation aborted at mysqltuner.pl line 45.
Solution:
- Download the Cygwin installation file setup-x86_64.exe from Cygwin Installation
- Install the perl_pods package using either method below:
Method 1: Using Cygwin Setup Window (GUI)
- Double-click setup-x86_64.exe to launch the setup wizard
- Follow the installation wizard until you reach the "Select Packages" screen
- If the view dropdown shows "Pending", change it to "Full" to see all available packages
- Search for "perl_pods" in the search box
- Click on the "Skip" text next to perl_pods to change it to the version number (this selects it for installation)
- Click "Next" to proceed with the installation
Method 2: Using Command Line (CMD)[1][2]
- Open a command line window
- Navigate to the directory containing setup-x86_64.exe, for example: cd C:\Downloads, then press Enter
- Enter the following command: setup-x86_64.exe -q -P "perl_pods"
Environment:
- Windows 2008 R2 standard
- Cygwin version: CYGWIN_NT-6.1 Win2008R2-0-0 2.9.0(0.318/5/3) 2017-09-12 10:18 x86_64 Cygwin (information returned from uname -a)
How to resolve: (Cygwin) wget command not found[edit]
Condition: When I tried to download the MySQLTuner using wget command but met the error.
Solution:
- Download the installation file setup-x86_64.exe of Cygwin from Cygwin Installation
- Open the command line window
- Change to the directory where the file setup-x86_64.exe located e.g. cd C:\Downloads> and than press the key Enter
- To install the packages: wget. Keyin setup-x86_64.exe -q -P "wget" or follow the steps on terminal - WGET Command Not Working in Cygwin - Super User if you prefer the GUI window.
How to resolve: (Cygwin) unzip: command not found[edit]
Condition:
$ unzip -l sysschema.zip -bash: unzip: command not found
Solution:
- Download the installation file setup-x86_64.exe of Cygwin from Cygwin Installation
- Open the command line window
- Change to the directory where the file setup-x86_64.exe located e.g. cd C:\Downloads> and than press the key Enter
- To install the packages: unzip. Keyin setup-x86_64.exe -q -P unzip
How to resolve: Attempted to use login credentials, but they were invalid.[edit]
Condition:
$ perl mysqltuner.pl >> MySQLTuner 1.7.5 - Major Hayden <[email protected]> >> Bug reports, feature requests, and downloads at http://mysqltuner.com/ >> Run with '--help' for additional options and output filtering Please enter your MySQL administrative login: root Please enter your MySQL administrative password: [!!] Attempted to use login credentials, but they were invalid.
Solution:
- Specify the host parameter to command line e.g. perl mysqltuner.pl --host 127.0.0.1
- Check the typo of mysql account and password
How to resolve: Performance schema should be activated for better diagnostics[edit]
Condition:
$ perl mysqltuner.pl
-------- Recommendations ---------------------------------------------------------------------------
General recommendations:
Performance schema should be activated for better diagnostics
Solution:
- Verify the MySQL setting. Execute the SQL query SHOW VARIABLES LIKE 'performance_schema'. The result should be OFF.
- Stop the MySQL service.
- Open the MySQL configuration file named my.ini on Win
or my.cnf on Linux 
The file maybe located in different path e.g. C:\xampp\mysql\bin\my.ini on Win - Edit the MySQL configuration file
[mysqld] performance_schema = ON
- Restart the MySQL service.
- Verify the MySQL setting again. Execute the SQL query SHOW VARIABLES LIKE 'performance_schema'. The result should be ON.
References[edit]
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