I have a server with a MySQL connection that I'd like to be persistent.
I've tried a few different ways to deal with it, and I'm told that "ping()" should reconnect if there's no connection. However, ping() actually gives the same error as other calls.
Does anyone have any suggestions on how to revive connections or some setting I can use to prevent timeouts.
Since MySQL 5.0.14, mysql_ping() does not automatically reconnect your connection. See my previous answer on how you might get around this.
However, there may be a better way to solve your "MySQL Server has gone away" error, see this answer.
Related
This might seem like a duplicate but trust me its not
So you guys are probably familiar with the error. The server doesnt start at the beginning and when i try to start it from Startup/Shutdown it gives this error.
Most of the people with this problem fixed it by starting MySQL server manually. Yeah but problem is mine was already working, i mean the server is on both in services and task manager. But for some reason im getting this error.
So my question is, how can i fix this?
- Checking server status...
- Trying to connect to MySQL...
- Can't connect to MySQL server on 'localhost' (10061) (2003)
- Assuming server is not running
Tried finding some logs but all says the same as above
Oh and i tried shutting the server down and opening again
Do you guys think that it might be happening because it is conflicting with some other sql program? I uninstalled everything related to sql but i might miss some stuff.
Programs i used to have are
-XAMP
-SQL Manager
-Microsoft SQL Server
-Microsoft SQL Server Management Studio
Like I said though, i uninstalled them all.
You need to check for all the mysql configuration files in /etc/mysql and check for any lines containing 127.0.0.1 and bound address or skip network and comment them.
Hope it helps.
It seems like for some reason it was having a conflict with other connection or port was just wrong on set up. I tried deleting all the connections i have and started a fresh one and it worked. Weird right? Here i was thinking when you uninstall MySQL, it woudl delete all the connections too.
I have the following error message:
SQLSTATE[HY000] [2003] Can't connect to MySQL server on
'192.168.50.45' (4)
How would I parse this (I have HY000, I have 2003 and I have the (4).
HY000 is a very general ODBC-level error code, and 2003 is the MySQL-specific error code that means that the initial server connection failed. 4 is the error code from the failed OS-level call that the MySQL driver tried to make. (For example, on Linux you will see "(111)" when the connection was refused, because the connect() call failed with the ECONNREFUSED error code, which has a value of 111.)
Using the perror tool that comes with MySQL:
shell> perror 4
OS error code 4: Interrupted system call
It might a bug where incorrect error is reported, in this case, it might a simple connection timeout (errno 111)
FWIW, having spent around 2-3 months looking into this in a variety of ways, we have come to the conclusion that (at least for us), the (4) error happen when the network is too full of data for the connection to complete in a sane amount of time. from our investigations, the (4) occurs midway through the handshaking process.
You can see this in a unix environment by using 'netem' to fake network congestion.
The quick solution is to up the connection timeout parameter. This will hide any (4) error, but may not be the solution to the issue.
The real solution is to see what is happeneing at the DB end at the time. If you are processing a lot of data when this happens, it may be a good ideas to see if you can split this into smaller chunks, or even pas the processing to a different server, if you have that luxury.
I happened to face this problem. Increase the connect_timeout worked out finally.
I was just struggling with the same issue.
Disable the DNS hostname lookups solved the issue for me.
[mysqld]
...
...
skip-name-resolve
Don't forget to restart MySQL to take effect.
#cdhowie While you may be right in other circumstances, with that particular error the (4) is a mysql client library error, caused by a failed handshake. Its actually visible in the source code. The normal reason is too much data causing an internal timeout. Making 'room' for the connection normally sorts it without masking the issue, like upping the timeout or increasing bandwidth.
I have a Django app running on Apache with wsgi module.
After few hours of inactivity I get that error and I have to restart the Apache.
Any ideas?
Thanks
This error message mean that the database server has closed the connection to you. I guess this is caused because the connection is idle.
I believe you can get this fixed by adjusting the wait_timeout inside the configuration file of your mysql database server. The file is most commonly named "my.cnf".
This, however, is not considered as a good practice. I would like to suggest you to optimize the application you are writing to open the connection to mysql on demand - there's no point to keep it open if you are not actively using it for a long time.
If you need a quick fix, use the mysql_ping() function to check whether the connection is still alive and re-open if necessary.
Occasionally we're seeing an error from ASP pages:
Microsoft OLE DB Provider for ODBC Drivers error '80004005'
[MySQL][MyODBC 5.00.11][MySQL] 2006 MySQL server has gone away
We're handling it the best way we can in ASP but it still crops up. I think it's more to do with the MySQL ODBC driver than the ASP code. We never see this with PHP code we also have running under the same IIS server, however PHP re-connects each time it is ran, whereas I believe the ODBC driver connects once and stays connected.
I've checked the settings in the driver but there doesn't seem to be anything I can change to help mitigate the problem.
Can anyone explain why this is happening and how to reduce the number of times it happens?
The problem is that the connection is timing out. This is not a setting that you can change at the ODBC level. I got round it by polling the connection every 10 seconds with a simple query. That keeps the connection alive.
Not sure about ASP, but in Java/Tomcat/DBCP we have ability to stick a simple test statement (such as SELECT 1) in connection pools before actually getting the connection. Maybe there is something similar in ASP, too?
I am facing connection failure to MySQL problem when I run my program for more than couple of days.MySQL Error Code is 2013 while connecting to Database. MySQL server and client programs are both on same machine. I am using FC5 as my OS and MySQL version is 5.0.18. Can anybody throw some light on this?
I am getting mysql error 2013 while calling mysql_real_connect()...
Any help is appreciated.
Try using localhost, instead of your own IP.
I don't know why, but this immediately fixed the problem for me.
I would be very grateful if someone could clarify
why this worked, all of a sudden.
Sounds like a firewall issue. Have you tried disabling the firewall temporarily?
Another possible solution involves edition the startup script as mentioned here and commenting out the following line:
SKIP=skip-networking
A third possible solution is mentioned here. The user tried to access an InnoDB database and InnoDB support was accidentially deactivated for the MySQL server.
(new) I found this official MySQL article which has lots of approaches to solve the problem. Did you modify the wait_timeout system variable?
Here's an answer you might not expect. I had encountered the same problem. MySQL Error 2013. Here are the symptoms:
PHPMyAdmin fired off 2013 and error 95.
I could shell into the MySQL monitor, but it took an inordinately long time to start. I could view tables and everything worked once the command line utility started
The server took a LONG time to stop and restart.
No errors in the MySQL error log.
I work with a good sysadmin who checked netstat -tn, which yielded the answer:
tcp 0 0 [my.srv.ip]:3306 184.73.87.215:59271 ESTABLISHED
tcp 0 1 [my.srv.ip]:38138 184.73.87.215:113 SYN_SENT
The IP resolves to Amazon Web Services. Some prick was leeching onto my 3306, even though everything but port 80 is allow-only. It's time to review my firewall rules.
There were no new tables, and mtop didn't show any activity, but I found a ton of these in the auth log:
Apr 19 15:14:52 magic2 mysqld[18953]: refused connect from ec2-184-73-87-215.compute-1.amazonaws.com
Apr 19 15:18:02 magic2 mysqld[18953]: refused connect from ec2-184-73-87-215.compute-1.amazonaws.com
After blocking the offending IP in iptables, the problem suddenly went away. Sneaky Bastards. The moral of this story is: What looks like bug, might be a hacker.
bz
Check your my.cnf. Set your bind-address to the server's IP address. Solved the issue for me. NO ONE seemed to know the answer to that one!
My fix was - change 'localhost' to '127.0.0.1'
It could be a network error that caused the TCP/IP connection to drop, or the wait_timeout was exceeded on the server; the latter can actually be useful in keeping the # of open connections down, but the app will then need to handle errorcode 2013 correctly!!