I have a MySQL 5.7.16 running on a Centos 6. I read about these two configuration variables as,
interactive_timeout - interactive time out for mysql shell sessions in
seconds like mysqldump or mysql command line tools.
wait_timeout - the amount of seconds during inactivity that MySQL will
wait before it will close a connection on a non-interactive connection
in seconds.
I set both these variables to 120 seconds in my server which means that after this time, both interactive (mysql shell) and non-interactive (like front end applications) should have their connections get disconnected automatically, if they are in "sleep" mode.
I observed some sessions from the application and other TCP/IP connections from different IDEs like MySQL Workbench running even after 120 seconds. Sometimes they go more than 200 seconds.
Are there any other settings I need to do in my configuration file?
Did you set the GLOBAL variable to 120?
Use
SET GLOBAL wait_timeout = 120
insted
SET wait_timeout= 120
remember that value is refreshed only for new connections.
Run:
SELECT ##global.wait_timeout, ##session.wait_timeout;
to check the real value.
Related
I have created a small kivy app. Here, I have made use of mysql database. When the kivy app gets killed or destroyed ,I want to close the database connection. How will I know if my kivy app is running in background or destroyed.
to close database connection, you can set wait timeout parameter with minimum value which have 8 hours by default. So if database will have any idle connection, same will be killed by MySQL server itself.
Let's say, if we set wait_timeout 60 seconds. then idle connection will be active for 60 seconds only. after 60 seconds, connection will be released. To change required variable, Please use below steps:
mysql -uUSER -pPASSWORD
then
set global variables wait_timeout=60;
or you can also set this variable for your kivy app only with session variables
When manually running an sql query from an app server, if a user just clicks the X to close the window instead of using F12 or the menu to close the connection to the DB, what kind of negative impact can there be?
.
Is there an automatic timeout for connections?
The timeout of a MySQL connection is defined in the /etc/my.cnf file in the wait_timeout server system variable. It's defaulted to 28800 (seconds) - we usually set it for our clients to a very low value - ranging from 10 seconds to 60 seconds. So, if you leave a connection unclosed, then it'll close, by default, after 28800 seconds (that's very high if you have a large number of clients using the app).
In your case, interactive_timeout doesn't apply, since you are not really using the console.
If a connection last longer than 'interactive_timeout' limit value, will that connection get dropped automatically.
which are all connections will it drop. I mean only Sleep connections or even active connections as well?
Then what about wait_timeout variable ... ?? please explain.
interactive_timeout - The number of seconds the server waits for activity on an interactive connection before closing it.
wait_timeout - The number of seconds the server waits for activity on a noninteractive connection before closing it. This timeout applies only to TCP/IP and Unix socket file connections, not to connections made using named pipes, or shared memory.
On thread startup, the session wait_timeout value is initialized from the global wait_timeout value or from the global interactive_timeout value, depending on the type of client (as defined by the CLIENT_INTERACTIVE connect option to mysql_real_connect()).
Sleep connections and waiting connections are dropped.
For differences refer here.
Am using MySQL as Back end for my website, while executing the website.. at some phase i got the error as Too many connections.
Am using a class file for handling mysql transactions. in that class file i have a sub for closing the connections which is as follows:
Public Sub CloseConn()
ConnDB.Close()
ConnDB.Dispose()
End Sub
After getting the error i will restart the mysql for continue the operations. in mysql administrator i can saw that all the connections state is Sleep. how can i kill the sleepy connections programmatically?
mysqld will timeout DB Connections based on two(2) server options:
interactive_timeout
wait_timetout
Both are 28800 seconds (8 hours) by default.
You can set these options in /etc/my.cnf
If your connections are persistent (opened via mysql_pconnect) you could lower these numbers to something reasonable like 600 (10 min) or even 60 (1 min). Or, if your app works just fine, you can leave the default. This is up to you.
You must set these as follows in my.cnf (takes effect after mysql restart):
[mysqld]
interactive_timeout=180
wait_timeout=180
If you do not want to restart mysql, then run these two commands:
SET GLOBAL interactive_timeout = 180;
SET GLOBAL wait_timeout = 180;
Hi Any body please tell me , my application has 10 processes , all processes are connects to DB for getting customers details.and my DB wait_timeout value is 30 sec. what will happen when my application is sleep more than wait_timeout value ?
You will get MySQL server has gone away if wait_timeout exceeds.
I think you can use auto reconnect option in your application refer
http://dev.mysql.com/doc/refman/5.0/en/auto-reconnect.html