Viene visualizzato l’avviso “Errore nello stabilire una connessione al database” in WordPress?
Si tratta di un errore fatale che rende il sito inaccessibile agli utenti. Si verifica quando WordPress non è in grado di stabilire una connessione al database. Poiché diversi fattori possono influire su questa connessione, l’errore può essere un po’ difficile da risolvere per i principianti.
In questo articolo vi mostreremo come risolvere facilmente l'”Errore nello stabilire una connessione al database” sul vostro sito WordPress, passo dopo passo.
Cosa causa l’errore di stabilire una connessione al database in WordPress?
Un database è un software che facilita l’archiviazione, l’organizzazione e il recupero di dati da altri software.
Come sistema di gestione dei contenuti, WordPress utilizza un database per memorizzare tutti i contenuti e gli altri dati del sito web. Si connette quindi al database ogni volta che qualcuno visita il vostro sito web.
WordPress ha bisogno delle seguenti informazioni per connettersi al database:
- Il nome del database
- Nome utente e password del database
- Server di database
Queste informazioni sono memorizzate nel file di configurazione di WordPress, chiamato wp-config.php.
Se una di queste informazioni non è corretta, WordPress non riuscirà a connettersi al server del database e verrà visualizzato l’errore “Errore nello stabilire una connessione al database”.
È uno degli errori più comuni di WordPress. Oltre alle credenziali errate, questo errore può comparire anche se il server del database è inattivo o i file del database sono corrotti.
Detto questo, vediamo come risolvere il problema “Errore nello stabilire la connessione al database” in WordPress con una risoluzione dei problemi passo dopo passo.
1. Controllare le credenziali del database di WordPress
Il motivo più comune per cui si verifica un errore di connessione al database è la presenza di credenziali errate. Se avete recentemente spostato il vostro sito WordPress su un nuovo host, è probabile che il problema sia questo.
Le credenziali del database di WordPress sono memorizzate nel file wp-config.php. È il file di configurazione di WordPress che contiene importanti impostazioni, tra cui le informazioni sul database.
Se non avete mai modificato un file wp-config.php, date un’occhiata alla nostra guida per principianti su come modificare il file wp-config.php per maggiori istruzioni.
Si cercheranno le seguenti righe nel file wp-config.php:
// ** MySQL settings - You can get this info from your web host ** //
/** The name of the database for WordPress */
define( 'DB_NAME', 'database_name_here' );
/** MySQL database username */
define( 'DB_USER', 'username_here' );
/** MySQL database password */
define( 'DB_PASSWORD', 'password_here' );
/** MySQL hostname */
define( 'DB_HOST', 'localhost' );
In questo caso, è necessario assicurarsi che le informazioni relative al nome del database, al nome utente, alla password e all’host del database siano corrette.
Potete confermare queste informazioni dalla dashboard del vostro account di hosting WordPress. Per questo tutorial utilizzeremo Bluehost, ma la procedura sarà simile anche per altri pannelli di hosting.
Una volta effettuato l’accesso, fare clic sulla scheda “Sito web” nella colonna di sinistra e poi passare alla scheda “Avanzate”. Quindi, scorrere fino alla sezione “Database” e fare clic sul pulsante “Gestisci” accanto ad essa.
In questo modo si aprirà la pagina dei database MySQL in cPanel in una nuova finestra.
Qui, nella sezione “Database corrente”, si trovano il nome del database e il nome utente. Ricordate di copiare e incollare questi dati in un blocco note per poterli aggiungere al file wp-config.
Quindi, scorrere fino alla sezione “Utenti attuali”, dove è possibile fare clic sul link “Cambia password” accanto al nome del database.
Si accede così a una nuova schermata, in cui è possibile modificare la password del database secondo le proprie esigenze.
Una volta confermati tutti i dettagli del database, è possibile modificare le informazioni nel file wp-config.php, se necessario.
Quindi, provare a visitare nuovamente il sito web per verificare se l’errore di connessione al database è scomparso.
Se l’errore è ancora presente, significa che c’è qualcos’altro che non va.
2. Controllare le informazioni sull’host del database
Se si è certi che il nome del database, il nome utente e la password siano corretti, occorre assicurarsi di utilizzare le informazioni corrette sull’host del database.
La maggior parte delle società di hosting WordPress utilizza localhost come host del database. Tuttavia, alcune società di hosting WordPress gestite utilizzano server separati per ospitare i database. In questo caso, le informazioni sull’host del database non saranno localhost.
Ciò significa che dovrete contattare la vostra società di hosting WordPress per confermare questi dettagli.
3. Riparazione del database di WordPress
Ora potreste ricevere un errore diverso nella dashboard di wp-admin, come “Una o più tabelle del database non sono disponibili” o “Potrebbe essere necessario riparare il database”. In questo caso, è necessario riparare il database.
È possibile farlo aggiungendo la seguente riga nel file wp-config.php. Assicuratevi di aggiungerla subito prima della riga “Questo è tutto, smettete di modificare! Buon blog”:
define('WP_ALLOW_REPAIR', true);
Una volta fatto ciò, è possibile vedere le impostazioni visitando questa pagina: http://www.yoursite.com/wp-admin/maint/repair.php. Assicuratevi di sostituire yoursite.com con il vostro nome di dominio.
A questo punto, è necessario fare clic sul pulsante “Ripara database” per avviare il processo.
Nota: non è necessario che l’utente sia connesso per accedere alla pagina di riparazione del database. Una volta terminata la riparazione e l’ottimizzazione del database, assicurarsi di rimuovere questa riga di codice dal file wp-config.php.
Tuttavia, se non volete aggiungere alcun codice al vostro sito, potete anche riparare il database dal pannello di controllo del vostro account di hosting.
Visitate il vostro account di hosting e aprite la pagina “Siti web” dalla colonna di sinistra. Quindi, passate alla scheda “Avanzate” e fate clic sul pulsante “Gestisci” nella sezione Database.
Si aprirà cPanel in una nuova scheda. Qui, scorrere fino alla sezione “Modifica database” e scegliere il nome del database dal menu a discesa “Ripara database”.
Una volta fatto ciò, è sufficiente fare clic sul pulsante “Ripara database” per avviare il processo.
Il pannello di hosting riparerà automaticamente il database.
Una volta completato il processo, verrà visualizzato un messaggio di successo.
Ora potete visitare il vostro sito WordPress per vedere se l’errore è stato risolto o meno.
4. Controllare se il server di database è inattivo
Se tutto sembra essere corretto e WordPress non riesce ancora a connettersi al database, è possibile che il server del database(server MySQL) sia inattivo.
Questo potrebbe accadere a causa del traffico intenso su un server. Il vostro server host non è in grado di gestire il carico (soprattutto se avete un hosting condiviso).
Per questo motivo, il vostro sito diventerà lento e potrebbe anche dare errore ad alcuni utenti. In questo caso, dovreste telefonare o chattare con il vostro provider di hosting e chiedere se il vostro server MySQL è reattivo.
Inoltre, se sullo stesso server sono in esecuzione altri siti web, è possibile selezionare questi siti per verificare che il server SQL sia giù.
Se non avete altri siti sullo stesso account di hosting, andate semplicemente nel vostro cruscotto di hosting e passate alla scheda “Avanzate”.
Successivamente, fare clic sul pulsante “Gestisci” accanto alla sezione phpMyAdmin.
Si aprirà phpMyAdmin in una nuova finestra, dove si dovrà fare clic sull’opzione “Database” in alto.
Quindi, fare clic sul nome del database per accedere alle sue impostazioni. Se ci riuscite, è il momento di verificare se l’utente del database ha i permessi sufficienti.
Per farlo, occorre creare un nuovo file chiamato testconnection.php e incollarvi il seguente codice:
<?php
$link = mysqli_connect('localhost', 'username', 'password');
if (!$link) {
die('Could not connect: ' . mysqli_error());
}
echo 'Connected successfully';
mysqli_close($link);
?>
Dopo aver incollato il codice, assicuratevi di sostituire il nome utente e la password con i vostri. Ora è possibile caricare questo file sul proprio sito web e accedervi tramite un browser.
Se lo script si è collegato correttamente, significa che l’utente dispone di permessi sufficienti e che l’errore è causato da qualcos’altro.
Ora è necessario tornare al file wp-config e analizzarlo per assicurarsi che tutti i dettagli siano accurati e senza errori di battitura.
Altre soluzioni che hanno funzionato per gli utenti
Se i suggerimenti per la risoluzione dei problemi di cui sopra non riescono a risolvere l’errore di connessione al database sul vostro sito web, potete provare questi ulteriori passaggi.
Come riportato dai nostri utenti, questi passaggi hanno aiutato alcuni di loro a risolvere l’errore di connessione al database sui loro siti web.
1. Aggiornare l’URL del sito WordPress
Potete provare ad aggiornare l’URL del sito WordPress utilizzando phpMyAdmin in cPanel.
È sufficiente accedere a phpMyAdmin dalla dashboard dell’account di hosting e selezionare il database di WordPress dall’elenco.
Quindi passate al menu SQL in alto e inserite la seguente query MySQL:
UPDATE wp_options SET option_value='YOUR_SITE_URL' WHERE option_name='siteurl'
L’aspetto dovrebbe essere il seguente:
Non dimenticate di fornire l’URL del vostro sito e di cambiare wp_options con il nome della vostra tabella, poiché potreste aver cambiato il prefisso della tabella di WordPress.
2. Riavvio del server Web
Gli utenti di server dedicati, server locali e server privati virtuali (VPS) possono provare a riavviare i loro server.
In questo modo si riavvia il server web e il database, che potrebbe risolvere alcuni problemi temporanei che causano l’errore.
3. Chiedere aiuto
Se tutto il resto non funziona, potrebbe essere necessario contattare la società di web hosting. Tutte le buone società di hosting WordPress vi aiuteranno a risolvere il problema, vi indicheranno la direzione giusta o addirittura lo risolveranno per voi.
Potete anche assumere sviluppatori WordPress utilizzando una piattaforma come WPBeginner Pro Services per aiutarvi a correggere questo problema a prezzi ragionevoli. Abbiamo un team dedicato di sviluppatori esperti di cui potete fidarvi per correggere qualsiasi problema di WordPress.
Inoltre, è possibile utilizzare il servizio per la manutenzione del sito, la riparazione di siti violati, l’ottimizzazione della velocità, la ricostruzione del sito web e l’ottimizzazione SEO.
Speriamo che questo articolo vi abbia aiutato a risolvere il problema “Errore nello stabilire una connessione al database” in WordPress. Potreste anche voler consultare la nostra guida alla risoluzione dei problemi di WordPress per avere suggerimenti su come risolvere i problemi di WordPress da soli, oppure la nostra selezione di esperti dei migliori strumenti per freelance e sviluppatori di WordPress.
Se questo articolo vi è piaciuto, iscrivetevi al nostro canale YouTube per le esercitazioni video su WordPress. Potete trovarci anche su Twitter e Facebook.
Syed Balkhi
Hey WPBeginner readers,
Did you know you can win exciting prizes by commenting on WPBeginner?
Every month, our top blog commenters will win HUGE rewards, including premium WordPress plugin licenses and cash prizes.
You can get more details about the contest from here.
Start sharing your thoughts below to stand a chance to win!
Javatechig
Lovely. You saved my day.
CE
Thank you!!!!!!!! Worked like a charm!!
Mark Larson
You’re so helpful! All my writing was saved! Yes, I need to do a backup… I did one! Thanks so much, this is just the resource I needed. Luckily Google pulled it right up.
Michael Simoni
I have a test wordpress installation on my home computer running on fedora. I moved/reinstalled the computer with a recent copy of fedora. I restored the database and the wordpress installation. Everything should have been fine except I had the “cannot connect to the database” error. I have had this wordpress installation for a long time. Turns out that when I moved to the new server I also got a new my.cnf. Now I checked it and made everything the same but for some reason i did not add the following line in /etc/my.cnf. Maybe i just wanted to see what would happen. hmmm…what does this button do…..
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1
After I added that line, the database connection problem was fixed.
So I need to drop that user and recreate it with the new password format.
Note I also have
skip-networking
in /etc/my.cnf and….it works. That keeps mysql off the network, including 127.0.0.1. It’s just one less entry point for the mischief-makers.
Matt
I had a database-connection-error on a client’s site and could access the database via PHPMyAdmin but running the testconnect.php file suggested above came up with a response unlisted in this article:
“PHP Warning: mysql_connect(): No connection could be made because the target machine actively refused it.”
I got in touch with Fasthosts who my clients were with and it turned out that they had issues integrating PHP5.4 “and the only fix is to reset the MySQL database user password.”
So if you’re in that boat, then you may be able to fix it by accessing the database via PHPMyAdmin and running the query:
SET SESSION old_passwords = 0;
SET PASSWORD = PASSWORD(‘databasepasswordgoeshere’);
!! IMPORTANT NOTE !! : make sure you get ‘databasepasswordgoeshere’ correct otherwise you’ll be resetting your db password to something new rather than the same password and it could break your site even further!
Terry
I must be really dumb! i understand a little of wordpress but this all sounds way out of my leage.
I have tried to do exactly what you have said and this is what I get
Warning: Cannot modify header information – headers already sent by (output started at /customers/8/a/3/chigwelltkd.com/httpd.www/wordpress/wp-config.php:2) in /customers/8/a/3/chigwelltkd.com/httpd.www/wordpress/wp-includes/functions.php on line 2801
Error establishing a database connection.
I have no idea what to do next!!!
Not only have i lost the site from the web but I know cannot get in to wordpress admin.
IS THERE ANY HOPE!!!!!
WPBeginner Support
Undo the changes by accessing your site through FTP.
Admin
Rowan Weismiller
Thanks so much for writing this post, it saved me quite a bit of time and a lot of headaches. Cheers!
SH
Solved my issue in less than 10mins cause of this article
YOUR ARE DOPE…you mean business
Thanks a mil!!!
alin
thanks man it’s worked!
Diana
thanks. very good article
Nayonika
This tutorial has really helped solving my problem!! Thanx a ton!
Lyndsay
Thanks a lot, this helped me fix my websites!
Sumi Ghosh
Hi,
Recently i uploaded a theme to the wordpress site, i have also uploaded the local database. I have modified my wp-config file too. Still i am getting error database connection error. When i opened my wp-admin it redirecting to wp-login.
Can i know what might be the problem?
WPBeginner Support
We think its normal behavior for wordpress to redirect you to wp-login.php when you try to access wp-admin directory. Can you please explain further? have you checked your wp-config.php file? does it have your live site’s database information?
Admin
Aliesha
I had 4 sites give a 127.0.0.1 “Cannot connect to server” message & I also had no access to admin. I went through troubleshooting, & nothing helped. So, I contacted my web-hosting service, Bluehost, to inquire whether the MySQL server was responsive. The tech told me to login to my control panel’s File Manager, select “Show hidden files,” and then to go inside my root directory for each domain & rename my .htaccess file to .htaccess.old . He said he guessed that a plugin added code to my .htaccess file, causing my wp-admin to redirect to an IP address. It worked.
WPBeginner Support
Glad that it worked. However, you should find the plugin responsible for that and delete it.
Admin
Erik de Vries
Just got this error on my own website. wp-config.php was allright. PhpMyAdmin could load the database. When trying to open the wp_options table PhpMyAdmin said the table must be repaired. Using the repair function in PhpMyAdmin fixed the table, reporting one row had been removed (not saying which one). No clue as to what caused this.
Thanks for the article, helped me debug the error.
Ben
Just got this problem, checked db through host cPanel and admin user seems to have been removed from database assuming that is why wp cannot connect. Problem is my ftp also seems to have been knocked out so i am unable to apply any solutions! sub-domain seems to still be working. It’s difficult to imagine this as being anything other than malicious!
WPBeginner Support
Contact your web host for support.
Admin
Zimbrul
I just got this problem with one of my sites and fixing the database from wp-config.php did not work. I fixed it by upgrading to WordPress 3.6.1 in cPanel (Softaculous).
Kyra Dawson
Thank you guys! Great How To article!
Ike
Today, for some reason my site is facing the database connection issue.
• Confirmed my database access is working via testconnection.php.
• Changed the salt keys with new ones.
• Defined the proper site URLs to ‘WP_HOME’ and ‘WP_SITEURL’
• No issue with server slowness as my other websites in other root directories are working.
I’m guessing it may be a plugin recently added?
How do you properly uninstall a plugin if you can’t pull up both wordpress root and wp-admin directories in the browser?
Thanks in advanced.
Editorial Staff
Refer to this article:
https://www.wpbeginner.com/plugins/how-to-deactivate-all-plugins-when-not-able-to-access-wp-admin/
Admin
Anudeep
Thanks a lot for such a good article!
My problem was a bit different. I had this issue because of ‘clicky analytics’ plugin.
I almost went mad as i didnt have any idea of what the problem could be. Finally after lot of trial and error i figured out that it was a plugin interference.
Giorgos
Thanks for the post
Is work to me
Naman Agrawal
Huh! sir you deserve an award.
It just worked for me. I was having this problem from last one month and you just served with this.
Thank you very much
Roeland Sanctorum
Problem occured when requesting new password and didn’t realise this was going to create a db problem. Fortunately I found your comments and guidelines. Problem solved in 3 minutes.
Thanks again (now I’ve subscribed to your weekly email)
Editorial Staff
Thanks Roeland
Glad we were able to help.
Admin
Tamela
My problem happened when I moved the site to a new hosting. I’d altered the config file to match my new database, username & password. But nothing worked.
Your tip about checking the WP-admin page did the trick. It told me something was wrong with the username. I went into c-panel and realized I hadn’t tied the user to the database. Two seconds later, all was good!
You potentially saved me hours of testing the wrong things! Thanks!
Editorial Staff
Glad we were able to help
Admin
Stu Farrimond
I want to give you a big kiss.
VERY useful.
However, my issue seemed a little odd – and it might help someone else:
This morning our domain produced error:
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 30720 bytes) in /home/gurumaga/public_html/wp-admin/includes/class-wp-list-table.php on line 384
I tried to increase PHP memory allocation.
Added to wp-settings (in root folder):
define(‘WP_MAX_MEMORY_LIMIT’, ‘256M’);
resulted in:
‘Error establishing a database connection’
Removed line and added lower limit:
define(‘WP_MEMORY_LIMIT’, ’64M’);
resulted in:
‘Error establishing a database connection’
Removed all changes in wp-settings.php now as original.
‘Error establishing a database connection’ persisted (for 5 – 10 mins)
Before reverting to the original error:
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 30720 bytes) in /home/gurumaga/public_html/wp-admin/includes/class-wp-list-table.php on line 384
I increased the PHP memory limit to: define(‘WP_MEMORY_LIMIT’, ’64M’); again
Then ran the database repair as you advised.
Although no database errors were identified, the site is now back up and running.
Odd – I’m not sure if you or anyone else can make sense of it??
Jamila
THANK YOU.
Editorial Staff
You are welcome
Admin
Donatus
Thank you so much, i have repair my own and is working perfectly. my site is back
Michael
Embarrassed… I tried everything in this blog and was double checking everything…
It never occurred to me that I’d typo’ed when entering the password.
Doh! So, here’s a +! for double checking the basics
Shaqinah
Hi, I made the mistake of changing the home url, initially it was http://shaneynayguns.com/wordpress and the site url was: http://shaneynayguns.com/wordpress too. I then changed the site url to http://shaneynayguns.com (thinking that that will make my site go live, as you can tell I’m an absolute idiot at this). Nothing happened, so genius here, changed the home url to shaneynayguns.com. That’s when things start to go awry: I couldn’t log in to wp-admin anymore and going to .com/wordpress redirects me to an error page. (shaneynayguns.com remain unchanged and directs to a landing page) I then went on to a forum and followed the exact instructions which were:
1. go to phpmyadmin
2. go to the correct database
3. browse wp_option
4. edit site url (I changed it to .com/wordpress)
Apparently based on everyone’s comments, it worked for all of them… except me! shaneynayguns.com/wordpress now redirects to a page with “error establishing a database connection”! It’s driving me mental! I was hoping if any of you could help me with this. As is obvious, I have not a clue when it comes to web jargon so I would really appreciate a simplified solution. Yes I’m an idiot, and I terribly need help! (F.Y.I: I host on godaddy)
Thanks in advance!
Editorial Staff
Open your wp-config.php file and add this:
define('WP_HOME', 'http://shaneynayguns.com/wordpress'); define('WP_SITEURL', 'http://shaneynayguns.com/wordpress');1-click Use in WordPress
Admin
Anderson Tagata
Hey, this worked for me. My wordpress website is on Godaddy and i was trying to put inside of subdirectory. now it works. Just after this, show up some database upgrade screen then everything is fine. also, i took out these defines above and still working. thanks.
Zac
Thanks heaps for your info guide, helped me fix my problem.
To let you know my resolve, I could not see a typo in the wp-config.php but decided to delete my Database and linked Username. I then created new ones and manually updated the new data into the wp-config and boom straight in. One thing to note is the database and username were originally the same name, so not sure if that was an issue as its a new site.
Seth
My website is down and I keep getting “Error establishing database connection” message.
I checked my WP-Config.php page and it looks fine on the inside, but when I preview it, the page says this
Warning: require_once(reddoorplayhouse.com/open/wp-settings.php) [function.require-once]: failed to open stream: No such file or directory in /hermes/waloraweb096/b619/moo.reddoor1/wp-config.php on line 95
Fatal error: require_once() [function.require]: Failed opening required ‘reddoorplayhouse.com/open/wp-settings.php’ (include_path=’.:/usr/local/lib/php-5.2.17/lib/php’) in /hermes/waloraweb096/b619/moo.reddoor1/wp-config.php on line 95
What does that mean. And what can I do? Thanks for your help.
Michael Tidwell
This is a frustrating problem that has been happening multiple times to a few of my sites over the past few weeks. I can fix it easily enough by replacing the Unique Keys and Salts in my wp-config.php file (grabbing new ones at: https://api.wordpress.org/secret-key/1.1/salt), but then days later I have to replace them again… so while I can fix the symptom, I’m still trying to determine why this keeps happening at http://brioagency.com
Editorial Staff
This can be caused by a plugin that you have if it is messing with your settings.
Admin
manesh
Thanks a lot man, repairing the database fixed my issue!
Andrew Stark
Hi
Just thought I’d thank you for helping me fix a site.
Changing localhost to the database IP address fixed my issue.
Thanks
Andrew
Editorial Staff
Thanks for leaving a comment Andrew. Glad to help
Admin
Madhurie Singh
I had made copies of the files and saved them on the server.
So when today the database connection error occured, I relaized, I had changed user, , pwd, database access but nothing worked.
So renamed the current wp-config.php as wp-configold.php
and copied the wp-config.php from the archive and pasted as wp-config.php.
Voila it works.
Michael Stelly
Forgot that the database is “local” to the application. I used the site URL by mistake. Switched DB_HOST to ‘localhost’ and all is golden.
Thanks for the blog! +1
Ben
You know sometimes you just find the perfect resource and it answers all your questions. I tip people for pouring me a cup of coffee. I wish it was super easy to just put a buck or two in the wpbeginner tip jar right now, but I guess a thanks will have to do.
Editorial Staff
Thanks Ben. Its always our pleasure to help. The best way to thank us is by spreading kind words about our site or by simply sharing this article on twitter, facebook, etc
Admin
jAMIE
WP Beginner is just awesome & so is Syed! I don’t know how many times my search results have let me to your site and each time, I’ve learned something really helpful, useful, & practical.
This time, with my database connection error issue, I just had to clear my browser’s cache. FML Anyways, that was the advice that I got after contacting my host. It seems to have worked & hopefully that’s all it takes! How to prevent it from happening again is above me.
Mibo
All I have to say: “THANK YOU!”
your post fixed my issues and spared me a couple of hours of work.
Fre
For me the issue was solved by properly setting “siteurl” and “home” in wp_options table did the trick for me, I could log into my admin and change everything!
One day I’ll buy you a cookie!!
Julie Anderson
I have a big problem… i did not set the site up and do not have axxess to the php or any files. i was trying to add pages and the next time i visited the site there was the error. Do i need to get to the admin initiator etc, is there no other way into the site?
Editorial Staff
You need to have admin access to the site.
Admin
umar satti
You are My HERO
Stephen Doxsee
I get this error intermittently. Perhaps I don’t have enough resources on my amazon ec2 free tier instance. I’ve had the problem 3 times in the last week but have been able to solve it each time by restarting the database server.
Thanks for the post
udumbuke
For me issue was solved by properly setting “siteurl” and “home” in wp_options table
Mana
Thank you so much, Udumbuke. This was exactly the step I forgot in moving my site to a new host. I’m so glad I can stop headaching over this! And great guide altogether on this site.
Joyce Keller
This error happened to me because I wanted to back up my database and could not remember the password. I changed the password in GoDaddy – but this didn’t change it in the wp-config.php! Once I changed it in wp-config, everything worked okay again.
THANK YOU FOR SUCH A COMPREHENSIVE SOLUTION!!! And a truly useful site. Kudos!
JD
In step review of wp-config.php you have to consider the user name and password that is there in the file, the user may not exist in the database (mysql), the password has changed so check if there is the user. In case the user does not exist in the database create it, assign the password found in wp-config.php and provide permits for administration of the database (DBA).
This happened to me to restore my wordpress.
Oliver Wieland
Thanks dude! Restored my database and all i needed to do then was reassign the correct user with the correct database in cpanel.
Pat Walsh
Hi guys, thanks for this info.
Helped me to fix a problem with a WordPress site I created.
It had been happily running for over a month when it started having the “Error Establishing a Database Connection” error.
Finally fixed it by changing DB_HOST to use the full host name rather than the ‘localhost’ that had been in there before.
I don’t know why it worked initially and then stopped working. But its working now…
Cheers,
Pat Walsh
Forma
Having the same connection to DB problem, and after reading comments, I decided to change the wp.config file refrence to my actual host to localhost and for some reason that fixed it. So my solution was the opposite to the one above. Just a shot in the dark…
arman
it is indeed helpful for me as i m facing this problem currently… thanks for this great article..
Arifur Rahman
I’m getting this issue temporary at my site just for few seconds.
how can I be free from this?
Please help!
Editorial Staff
Find the root cause. It can be caused by a plugin. Or simply you need to upgrade your hosting plan if you are getting tons of traffic.
Admin
Arifur Rahman
Thank you,
I already upgrade my hosting plan from basic to Pro.
But still same as before.
I using Adminimize, AG Custom Admin, Akismet, BuddyPress Template Pack, Display widgets, Fast Secure Contact Form, Google XML Sitemaps, Jetpack by WordPress.com, Page Views Count, Polldaddy Polls & Ratings, User Switching, Better WP Security, BuddyPress, Hotfix, W3 Total Cache, wordPress Importer and WordPress SEO.
Which one is making problem??
Have you any Idea?
Eduardo Capanema
If you have all the info in the config file correct and is still having the problem, check to see if you have any spam prevention plugin active such as Fail2Ban. I found that it was causing the database problem. I believe it happens cause when you’re editing the wordpress via wp-admin, you make too many sequence requests to the apache it triggers the Fail2Ban service for www-data user. Try uninstalling Fail2Ban or any other spam controller. Then, restart both mysql server and apache to get hid of the Error message.
I hope this helps.
b
Stefano
Thank you guys. Problem solved. Very good post