Jak naprawiono błąd nawiązywania połączenia z bazą danych w WordPress?

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1. Barry

   Under CentOS 7, I saw: Could not connect: Can’t connect to MySQL server on 'xyz’ (13)

   The problem was due to SE Linux, as documented at

   The problem was corrected using the command:

   sudo setsebool -P httpd_can_network_connect_db=1

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2. neneh

   Thanks, very helpful

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3. Alberto

   After installing and setting up Mamp and a fresh Wordpress on a friends machine, had the dreaded blank page and „error establishing a connection” in the logs as well.

   After pulling my hair for a while, I noticed that the quotation marks in the wp-config.php file had been changed from straight ones ’ to curvy ones ’ in the few settings one has to edit, and this was causing the errors, the culprit?

   -> TextEdit <- I had used it to make those changes. In it's preferences, the "clever quote marks" setting should be turned off if you want to have those quotation marks remain as they should be.

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   • ka

     Thanks Alberto. Textedit has automatically overwritten the straight quotation marks with curly ones. replacing them with straight ones and saving the php file again did the trick.

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4. Bastien

   This error can also be triggered because of a DOS XMLRPC attack :

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   • Jesus

     How can I fix it?

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5. Tejas Waghmode

   HI

   I’m confuse, how to solve the problem?

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6. Zoe

   Hello, I’m new to wordpress and need some more help.
   My wp-admin page shows the „One or more database tables are unavailable. The database may need to be repaired” message…. so I know I need to add that bit of code. But how and where do I add it? I can’t login… I do not know what address to type in to access this php file. Help please
   My website is

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7. Pavanswin

   I am a wp beginner, you guys are awesome, helped me building my careers through this kind of articles. I migrated my website to and struggled with the error for many days and finally found a solution in the article and is very helpful. thank you all

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8. Julio Sanchez

   The original name of the file wp-config is wp-config-sample, I just wrote the original name and vuala no „Error establishing a database connection” message.

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   • WPBeginner Support

     wp-config-sample.php file is a sample file not the actual configuration file. The actual configuration file is wp-config.php.

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     Administrator

9. Sruly

   I have WordPress with Digital Ocean. I just restarted my server and that fixed the issue.

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10. Rudy

    Thanks, really thanks

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11. Nicholas

    If all fails, also try a swap file:

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12. Brendan

    „replacing localhost with the IP”

    This worked! Thank you so much for saving my ass

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13. Guy Pribyl

    Is there a way to have wordpress when posting this error message do a redirect to a non-wordpress page? I JUST WANT A BACK UP FOR WHEN THIS HAPPENS IN THE MIDDLE OF THE NIGHT.

    Thanks for your help

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14. Avioconsys

    Thanks Syed Balkhi and his team. It took me 5 minutes to solve the issue with this error. It was a bad update of the password for the general user.

    Fast and working. Very nice of you sharing this information.

    M.

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15. Suhel

    i am getting the different error but its something some like this,
    wpsa_options: Table 'aamtechn_wp949.wpsa_options’ doesn’t exist
    wpsa_postmeta: Table 'aamtechn_wp949.wpsa_postmeta’ doesn’t exist

    i am getting this message and i am not able to access the dashboard.please help me soon.

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    • Donal

      That looks like your data base is corrupted.
      Log in to your phpMyAdmin through your cpanel and repair them. Here’s a link to a tutorial…

      How to optimize your WordPress database with one click.

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16. Camaal Mustafa Sikander

    Thank you so much, this one fixed the Database error for me in the first step itself.

    Best wishes,
    Camaal

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17. Dudley Rees

    Thank you for your help. The username and password part of wp-config.php fixed it for me.

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18. Robert Varga

    I had this problem, and I spent 2 much hours on fixing it … Finally I solve that mistery. My problem was in htacces file, it only had Rewrite Engine line , I just c/p this „default” htaccess content in it and replace it with file on server, and tadaam it work now

    „default” htaccess content :

    # BEGIN WordPress

    RewriteEngine On
    RewriteBase /
    RewriteRule ^index\.php$ – [L]
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule . /index.php [L]

    # END WordPres

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19. Daniel M

    how do i solve depreciation errors for db connection using either PDO or MYSQLi? please help

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20. prince vashisht

    I changed the username (wp_users) from phpmyadmin and now I am getting the same issue.Reverting the changes is also not helping me out.Please help.

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21. Wayne

    When I first experienced this error I was so devastated and I wonder how will I resolve this issue. I did some research and noticed that my database name was the problem. So I went into MYSQL and change the database name. This article explains it all

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22. Kevin Wells

    For whatever reason, I ended up having to recreate my MySQL user in the database. After I did that, my website functioned normally again.

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    • Maja

      Change of user also helped me after hours of debbuging

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23. Christine F

    Thanks so much for this!

    I encountered the same issue earlier. I changed the database password and then this error appeared. We have GoDaddy so what I did was just go to the File Manager, open the WP-Config.php and changed the (’DB_PASSWORD’, 'database-password’); to the one I recently used. Real simple but wouldn’t have done it without this article.

    Thanks again!

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    • Matthew

      Thank you for this reply, Christine. I, too, changed the password and found that to fix the issue as well. Perhaps MySQL had reset it without notifying me.

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    • Dutch

      Thanks for this tip! Don’t know how you figured this out from the article. Was about to reload everything..and tried this just in case and it worked. Also on Godaddy, used Installatron to start the installation and uploaded the rest manually.

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24. Alexander

    In my case I solved the problem just updating the password of the DB.
    It seems the password was to weak.

    ciao
    Alexander

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25. sonu arora

    hey i m facing a weird issue with my website, i.e. when i try to check in pingdom then the screenshot generated there shows me data connection error, while when i am opening my website in normal tab or iphone, it gets open. could you please suggest me what to do? i am worried whether my website is showing to public or not. url is thanks in advance!

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    • WPBeginner Support

      Try changing server locations in Pingdom test settings. Also try other tools like Google Page Speed tool.

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      Administrator

26. Angel

    You say to put this in your wp-config.php file….. define(’WP_ALLOW_REPAIR’, true);
    you don’t say a single word as to where to put it. I dropped it in right at the top and got a HUGE WP error message. You had it on line 1 without anything to indicate context of where to put it. So most would assume it would go on line 1 at the top. If it doesn’t go there, why not give helpful and specific instructions?

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    • WPBeginner Support

      You need to add this just before this line:

      /* That's all, stop editing! Happy blogging. */

      Thanks for bringing this to our attention. We have updated the article.

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      Administrator

27. Nica

    when i try this:

    I get an error:
    Could not connect: Lost connection to MySQL server at 'reading initial communication packet’, system error: 95 „Operation not supported”

    When i test this to php:

    It shows:
    This site can’t be reached

    The connection was reset.
    ERR_CONNECTION_RESET

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28. samchief

    Problem resolved. DB_host was the problem on ipage, it’s quite different from others

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29. RINKU MEHAR

    how could i solve this errors:

    Warning: require_once(C:\xampp\xampp\htdocs\wordpress\wp-admin\admin.php): failed to open stream: No such file or directory in C:\xampp\xampp\htdocs\wordpress\wp-admin\index.php on line 10

    Fatal error: require_once(): Failed opening required 'C:\xampp\xampp\htdocs\wordpress\wp-admin\admin.php’ (include_path=’.;C:\xampp\xampp\php\PEAR’) in C:\xampp\xampp\htdocs\wordpress\wp-admin\index.php on line 10

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30. FranciscoMary Aghogho

    Please I need an assistance here. I tried changing my site’s url from http to https and now cannot view my site. It say a coonection could not be established. Please what could I do in this instance. Thanks.

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    • sourcebreak

      Issue
      If you update from php 5.2 to 5.4 or 5.5 then you will get this error database connection error in wp.

      Cause
      If your password is Pre mysql 4.0 then you will get this error

      Fix
      Login to phpmyadmin >> user >> change password
      type your mysql password >> select >> MySQL 4.1+ compatible and go

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31. Kanif

    I was also facing this issue. I googled it and come to this post. It is really awesome, deep thinking on what all problems may come with this error.
    Mine problem is resolved by doing database repair and optimization.

    Thanks buddy,
    Kanif

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32. ScienceMan

    Thanks for the great post. My situation was interesting, I migrated my server to another account with the same provider. The result was the dreaded „Error Establishing a Database Connection”. Thanks to this article, I knew to have a look at the wp-config.php file.

    When I logged into my new server cPanel and checked the MySQL databases, I immediately spotted the problem. Due to the server migration, the name of the database and user had changed. The databases names at my provider all default to „accountname_databasename”. Also, the database username defaults to „accountname_username”. I suspect other servers are similar.

    Since my server account name changed with the server migration, so did the name of all my databases and database usernames.

    So to fix it, all I did was change these two lines in the wp-config,php file:

    /** The name of the database for WordPress */
    define(’DB_NAME’, 'XXXXXX_databasename’);

    /** MySQL database username */
    define(’DB_USER’, 'XXXXXX_username’);

    Basically, you want to check carefully to make sure the „XXXXXX” in the wp-config.php file matches what’s at your server.

    Thanks again!

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33. igwe simon

    I mistakenly changed my site and wordpress url to one of my domain so i had to go and change the dns and park it on the website, so i waited for some hours but the domain was still propagating then i read a tutorial (codex.wordpress.org/Changing_The_Site_URL) and followed an option there by editing my functions.php and the next thing i saw was „One or more database tables are unavailable. The database may need to be repaired.”, so i followed the instructions here and still the problem is still active. I need an assistance please.

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34. hafsa munir

    I have following error in my xammp server,how can i resolve it
    he following error was encountered while trying to retrieve the URL: localhost/phpmyadmin/

    Unable to determine IP address from host name .localhost

    The DNS server returned:

    Name Error: The domain name does not exist.
    This means that the system was not able to resolve the hostname presented in the URL. Check if the address is correct.

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    • WPBeginner Support

      Try accessing without www

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      Administrator

35. val girich

    I am seeking free videos on how to use W.P. once it is set up ready to edit, ad docs and so on.

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    • WPBeginner Support

      Please see our free WordPress videos or subscribe to our YouTube Channel.

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      Administrator

36. S

    hai
    i done everything as you mentioned in the post but when i opened wp-admin/ then again this error was coming „One or more database tables are unavailable. The database may need to be repaired.”
    So plz help me what to do

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37. Manny

    Thanks!

    I just logged in through FileZilla and checked out the wp-config.php file and double checked everything and realized that I updated my database password but it still showed the previous default password on wp-config.php. So after changing it in the file and saving the changes I was able to access my site again. Your help allowed me to solve my problem, thank you!

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    • WPBeginner Support

      Glad you found it helpful.

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      Administrator

38. Jeremy Smith

    One very important that’s been left out in this post is the „turn it off and turn it back on again” approach.

    If you haven’t actually changed the wp-config file I don’t think you should be going in and fiddling around with it, at least not in the first instance.

    What you should do first is attempt to restart the mysql server.

    To do this (In Terminal)
    1. SSH into your website (you will need your key ’.pem’ file)*
    2. To restart your mysql type „sudo service mysqld restart”

    This has worked every-time for me.

    *On a Mac
    1. Get your ’.pem’ file. I got mine from Amazon Web services (hosting the site)
    2. Enable SSH on your Mac – Google it
    3. Open Terminal
    4. Change directory to where you have stored your ’.pem’ file. -It’s probably easiest to save this on your desktop, then you can just type 'cd Desktop’ and it should take you there.
    5. Type 'chmod 400 yourpemfilename.pem (allows you to use this key to get in)
    6. Type 'ssh -i „yourpemfile.pem” remote_username@remote_host – type the speech marks here
    7. Once logged in (You may have to type y a few times to get you in) type
    sudo service mysqld restart

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    • Jcirni

      Restarting works but why does this error keep happening? Happens once a week.

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39. Malkesh

    Hi, my wordpress site gets this error very often,
    we are using AWS, so i need to run this command to restart mysql :

    sudo restart mysqld restart

    the same issue i have also on digital ocean too..

    so i am sure not this is not an server issue, it’s should be some thing in wordpress, that’s put down mysql server..

    Thanks

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    • dino

      Same problem here. At least two times per day my site , which is in digital ocean , loose sql connection.
      I have try to optimize my database, bvut nothing works. Any idea?

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40. Glenn

    Thanks,

    When WordPress dies it is scary for a WordPress newbie. I found your solution easy to understand, implement and worked a treat.

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41. Faiza

    Hi,

    This blog was very helpful but I still haven’t been able to figure out this problem. My WP-Config.php file shows me this localhost:

    I am using GoDaddy, I have tried replacing this with local host, my IP address, and (godaddy). Nothing has worked Can I get some help here?

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    • WPBeginner Support

      Please contact godaddy support.

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      Administrator

42. Claire

    would the problem be that my domains dns settings haven’t updated yet?

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43. Anupam

    Updating the WP-Config file works for me. Thanks a lot.

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44. Brandon

    WOW!!!! Came across this site because my wife’s business site went down and I was able to fix it in minutes! Thank you!

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45. Cidina

    Thank you soooo much. This post saved my 6-month large project in Wordpress. Trying to switch directories I lost connection to the database. I’m not a .php programmer but the topic is so well explained here that it took me five minutes to fix it after finding this blog. Your are awesome!!!

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    • WPBeginner Support

      Thanks for the kind words.

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      Administrator

46. Nino F

    If you changed your password in phpmyadmin, you have to change it in your wp-config.php aswell, if you don’t do that the website doesn’t work. You have to link the two with eachother.

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47. Eddie O'Hagan

    I was getting this error I think because of the theme I had, I changed the theme and I haven’t gotten the error since, I noticed this because when I ran the repair, the comments tables were the ones that had the errors.

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    • dino

      how often did you have this problem?
      I have the same , and i loose connection at least twice per day.
      I tried many things but nothin works. If it is the theme i will try it..

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48. samuel nmeje

    this was indeed helpful. thanks a lot.

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49. Ram

    if you use xampp for wordpress offline then the error is removed by following process:
    open in Xampp folder „\xampp\phpMyAdmin\config.inc.php” and then check username and password
    set the same password to wp-config then the error is not appear

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50. Micah

    This is very helpful. Thank you very much!

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