I have a development environment set up with remote access to a shared dev database.
I'm experiencing VERY slow response time from the remote MySQL server. I've added skip-name-resolve to the my.cnf file, restarted mysqld, and also verified that it is indeed, turned on via 'show variables' at the mysql command line.
Interestingly, if I connect to the command line interface remotely via
mysql -h IPADDRESS -u USERNAME -p
All commands are executed lightning fast.
Select * on a large table comes down the pipe instantaneously.
I'm wondering why the CLI would allow immediate response, but the php connection in my application waits 8-10 seconds before returning any data from the remote MySQL server. It's an Amazon EC2 instance, and it's the Amazon linux ami, seems to be similar to CentOS. Any ideas?
Thanks!
I've just solved same problem I was having, took me 4 days.
Apache was ok
MySQL was ok too
Problem was in my script - gethostbyaddr();
when accessing web server on the localhost is fine.
But when accessing the server from another computer takes ages, so for now I have commented out gethostbyaddr() and it is fast as if run from localhost.
I am guessing gethostbyaddr() is some sort of Windows DNS issue which I'll look into later
I'd start by determining where the slowness comes from. Is it in establishing the connection when you open the db, or is it in returning the results from the select, or both? You don't say what version of PHP you're using or what version MySQL is running on the server. My money would be on that specific combination being problematic. Make sure you're running the latest updates on your AMI.
Related
I'm using wsl2 on a windows machine. I want to view my databases that I have on mysql server ubuntu in a GUI such as mysql workbench (on windows) but it seems as the two are not linked. In the pictures provided you can see that when I login to root, it displays different databases, I also use different passwords for root on both servers. When I try to use the root password from the ubuntu server in workbench, I get the error that I cannot connect to the database server.
Ubuntu databases
MySql workbench databases
MySql workbench config
MySql workbench error
UPDATE 2022
I found myself in this same need, and found a good resource that tackles this issue rather nicely. The solution itself predates even this question, funnily enough.
Long story short, check the following GitHub repository. Instructions are available and I can confirm it works on Windows 10.0.19041.1415 and WSL2.
https://github.com/shayne/go-wsl2-host
========================================================
WSL doesn't use the same IP as Windows, meaning you can't access it using localhost. Also, WSL IP changes everytime you boot it, meaning that the credentials for the connection will work only once.
In the sister community SuperUser, this has been discussed and some workarounds are avaliable, but I can't tell if they will work specifically with MySQL Workbench, as they ofter require you to use PowerShell/CMD.
Please, refer to the following discussions, which also provide further sources on the topic (There is one in particular that might be useful if you are running Windows 10 Pro).
Make IP address of WSL2 static
localhost and 127.0.0.1 working but not ip address in wsl windows 10
There are several requests to allow us to set WSL IP statically, so we can register it as a host in Windows DNS Host file and use that alias instead of the IP while setting up a connection (or use the IP itself, since it would be static anyway), but it is not ready yet AFAIK.
After reading the answer from #Jetto, I thought you could create a batchfile like this:
#ECHO OFF
wsl export wsl=$(hostname -I); sed -i -e "s/172.[0-9]*.[0-9]*.[0-9]*/${wsl/ /}/g" /mnt/c/Users/*username*/AppData/Roaming/MySQL/Workbench/connections.xml
This will replace the ip-address to the current ip-address of your wsl instance (relying on the fact that is starts with 172.)
If you start MySQL Workbench after running this script, you should be able to connect to MySQL (or MariaDB) which is running in the WSL2 session.
Disclaimer: I am not responsible for the fact that you did not make a backup of the file connections.xml 😉
P.S. In case you wonder: Yes this instance on my computer uses port 3356. But 3306 should work too if you do not have a local MySQL running.
I have been using MySql Workbench to connect to a local MySql server and to remote MySql Servers. The last couple of days the Workbench freezes when I connect to the local version. It still works for the remote servers.
I am using workbench 6.3.4 and then tried 6.2.5 just to see if it is a version issue.
I also can access the local MySql instance using HeidiSQL.
Any recommendations on what to look for?
Update
The advice to recreate the connection solved the issue. I just created a new one and it works fine.
A couple of things you can try:
Try restarting the sql server (remember, workbench is just a utility for accessing a db, it does not host the database for you)
See if you can access mysql on the command prompt / terminal, the command for mac & windows
(once you navigate to the mysql folder, try the command:)
mysql -u root
(if you have a password-protected account, the command will be
mysql -u someuser -p
If the above doesn't work, mysql is either offline or denying you access (depending on response), and you'll need to setup the server / assign privileges.
If all else fails, it may help to try another version of SQL / Workbench (for a easy-to-use sql sever setup, I'd recommend WAMP or MAMP, assuming you want a HTTP server bundled with it)
Additionally, it may help to recreate the local connection in workbench (of if your getting regular crashes, reinstall & update workbench). Good luck with it.
About 2-3 weeks ago I stopped using phpmyadmin and started using MySQL Workbench. Now, I can't connect to phpmyadmin. I tried connecting from two different computers and from the server. Tried connecting with at least 4 users and root. I am suspecting that this is Workbench's fault. During the time I used Workbench I made some changes to user privileges, but don't remember the specifics. I get "Wrong username/password".
Any thoughts ?
Looks like some of the comments have been deleted, but judging by what's left there was a suggestion for you to check your permissions for your user with hostname localhost, and it appears you did not understand that % is not the same as localhost. Many installations come with several root users, one for host localhost, one for host %, and sometimes a third for 127.0.0.1. This is normal and part of how MySQL handles permissions. TCP/IP connections match %, socket connections do not (they use localhost).
Another thing that's important to realize is that, when using phpMyAdmin, it doesn't matter what client machine you're using; what matters is what machine is the web server, since that's where the requests to MySQL come from. So you can easily get a bit confused if using a remote machine to connect to a web server running on the same machine via sockets to the MySQL server -- even though you're on a remote machine from the MySQL server, in this case it appears as a localhost connection to MySQL.
Anyway, very likely what happened was you were "cleaning up" extra users and removed one that had the opposite host value (either % or localhost); I'd simply recreate your user with the other host. That should clear it up for you.
I downloaded MySQL, and installed it correctly.
When I started the MySQL workbench it shows me these databases (I don't remember all of them):
sakila
test
world
It is ok, they are work, I can access them with no problems. But later I installed xampp, after that when start MySQL workbench it shows me different databases:
cdcol
phpmyadmin
test
webauth
I can't access the previous databases.
How to switch between them?, or
view them all?
Not sure whether xampp uninstalled your first server, but it is more likely that its installation changed the default MySQL TCP/IP port (3306). Maybe both servers try to run on the same port (which doesn't work) and one failed to start (in this case the first installation).
So what you need is to make each server run on its own port. You can use MySQL Workbench to make the necessary change. However first you need to check if still both servers are installed. Do you have 2 MySQL services running? Switch off one of them and connect with MySQL to the running server. If that works shut this down and run the other service. Connect again with MySQL but this time go to the admin section, config file, and change the port to e.g. 3307. Save and restart the server (all within WB possible). Now you should be able to run both servers at the same time (provided the first one runs still on the default port). Create a second connection and server instance in WB so that you can access one server at 3306 and the other at 3307
If there's only one MySQL service entry then xamp has removed the previous installation and you must install it again if you really need two servers.
I have a local Perl script that does a lot of parsing of web pages and then successfully updates my local MySQL database (WAMP server). I now want to send this local data to my remote server, but remotely connecting to my database isn't allowed with my hosting company. Unfortunately I never thought of that problem.
So, I now need to find an automated way to update my remote server (every 15mins). I mistakenly thought I could just edit my Perl script with the details of the remote server.
I am aware that I could use CGI or PHP to do the parsing on the server, but I really want to keep the parsing local for now.
Summary:
Local MySQL database -> remote MySQL database every 15mins ??
Any ideas what I can do?
Thanks :-)
if replication is not an option but you can still establish an ssh connection from local box to remote box, then
run mysqldump to export data into a file http://dev.mysql.com/doc/refman/5.1/en/mysqldump.html#option_mysqldump_where
scp file to remote box
mysql -u username -p password database_name < dumpfile.sql
If your server does not accept connections to mysql remotely you can create a ssh tunnel. Then you can apply the replication solution proposed by matcheek.
Here is a hint: http://realprogrammers.com/how_to/set_up_an_ssh_tunnel_with_putty.html
Based on the responses I've received, I think the answer to my original question is to stop using a cheap shared hosting company (no remote access to server, no cron jobs, etc) and start using a VPS hosting company. That will give me the freedom to remotely connect to my server, etc.
Thanks again to those who replied.
From how you described the problem replication seems to be the way to go
http://dev.mysql.com/doc/refman/4.1/en/replication-howto.html
Using a cron job could be another option. It would read file from your local machine and import data in the remote box.
I suggest the follwing:
On every local run, write the SQL statements (sans SELECT),
that you run against your copy of the DB also into a file
On your WAMP server create a small PHP script, gives back the oldest script from the first step (soem auth ofcourse)
On your remote server run a cronjob, that gets this from your local server and runs the SQL against the DB, then acknowledges it
On acknowledgement on your WAMP server, drop the file and give back the next one.
While this seems complicated, it allows for a restart after connectivity loss - something that I consider imposrtant.