Message sqlstate(hy000): general error: 2006 mysql server has gone away
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I found that I can change it for the session, so you can issue the query: SET session wait_timeout=28800 UPDATE The OP determined that he also needed to change the variable The code below shows the setting before and after the change to verify that it has been changed. So, set wait_timeout=28800 (and interactive_timeout = 28800) at the beginning of your query and see if it completes. Remember to insert your own db credentials in place of UPDATE Also, if this does work, you want to be clear on what you are doing by setting wait_timeout higher. Setting it to 28800 is 8 hours and is a lot. The following is from this site. It recommends setting wait_timeout to 300 - which I will try and report back with my results (after a few weeks).
The MySQL server has gone away error, means that MySQL server (mysqld) timed out and closed the connection. By default, MySQL will close connections after eight hours (28800 seconds) if nothing happens. However, in some cases, your web host, DBA, or app developer may have decreased this timeout setting, discussed below. MySQL server has gone away, can be a frustrating error to solve. This is partly because to solve this error; sometimes the solution involves multiple layers, application, or service config changes. This article includes solutions I’ve seen for this MySQL server general error. If you’ve found a solution not listed or linked to on this page, please send me a note or leave a comment. MySQL server has gone away error log examples.Keep in mind that this error can be logged in a few ways, as listed below. In addition, at times, the error is only an indication of a deeper underlying issue. Meaning the error could be due to a problem or bug in your connecting application or remote service. In which case, you need to check ALL related error logs with the same timestamp to determine whether another issue may be to blame. Application Performance Monitoring solutions and PHP Stack trace tools can be of help. With this in mind, here are error log examples of the MySQL server has gone away error: General error: 2006 MySQL server has gone away Error Code: 2013. Lost connection to MySQL server during query Warning: Error while sending QUERY packet PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away MySQL wait_timeoutThe reason for MySQL server has gone away error is often because MySQL’s wait_timeout was exceeded. MySQL wait_timeout is the number of seconds the server waits for activity on a non-interactive connection before closing it. You should make sure the wait_timeout is not set too low. The default for MySQL wait_timeout is 28800 seconds. Often, it gets lowered arbitrarily. That said, the lower you can set wait_timeout without affecting database connections, can be a good sign of MySQL database efficiency. Also, check the variables: net_read_timeout, net_write_timeout and interactive_timeout. Adjust or add the following lines in my.cnf to meet your requirements: wait_timeout=90 net_read_timeout=90 net_write_timeout=90 interactive_timeout=300 connect_timeout=90 MySQL connect timeout in PHP configHave a look at your php.ini config file. You’ll find MySQL configuration options. Make sure the mysql.connect_timeout setting isn’t set lower than MySQL wait_timeout, discussed above. The PHP option mysql.connect_timeout is not only used for connect timeout. It’s also when waiting for the first response from the MySQL server. Try increasing mysql.connect_timeout to match or exceed your MySQL wait_timeout and make sure that mysql.allow_persistent is on (default = enabled). mysql.connect_timeout=90 mysql.allow_persistent=1 IMPORTANT: Read first about PHP Persistent Database Connections to understand the benefits and caveats. Also, adjust PHP’s default_socket_timeout. For example, a PHP script could be running a slow query. Creating a wait that utilizes the default_socket_timeout. Eventually, it quits with the “MySQL server has gone away” error. Before you send hate mail, please read here first. Here’s an excerpt: “PHP, by default, sets a read timeout of 60s for streams. This is set via php.ini, default_socket_timeout. This default applies to all streams that set no other timeout value. mysqlnd does not set any other value and therefore connections of long running queries can be disconnected after default_socket_timeout seconds resulting in an error message 2006 – MySQL Server has gone away.” default_socket_timeout=90 To be throughout, also adjust max_execution_time and max_input_time still in php.ini, if necessary. If PHP’s execution time is longer than max_execution_time, then MySQL server might disconnect. max_execution_time = 90 max_input_time = 90 MySQL max_allowed_packetmax_allowed_packet is the maximum size of one packet. The default size of 4MB helps the MySQL server catch large (possibly incorrect) packets. As of MySQL 8, the default has been increased to 16MB. If mysqld receives a packet that is too large, it assumes that something is wrong and closes the connection. To fix this, you should increase the max_allowed_packet in my.cnf, then restart MySQL. The max for this setting is 1GB. For example: max_allowed_packet = 512M MySQL innodb_log_file_sizeYou may need to increase the innodb_log_file_size MySQL variable in your my.cnf configuration. MySQL’s innodb_log_file_size should be 25% of innodb_buffer_pool_size (if possible, no less than 20%). Remember that the larger this value, the longer it will take to recover from a database crash. (Source: Phpmyadmin Advisor) This means for example: if your buffer pool size is set to innodb_buffer_pool_size=16G and your innodb_log_files_in_group setting is still set to the recommended default of 2 files (innodb_log_files_in_group=2), then your innodb_log_file_size should be set to 2G. This will create two (2) log files at 2GB each, which equals 25% of innodb_buffer_pool_size=16G. WARNING: You must stop MySQL server in order to change innodb_log_file_size or innodb_log_files_in_group. If you don’t, you risk catastrophe! (Read: MySQL Log Redo instructions.) Other causes of MySQL server has gone awayRemote MySQL connectionsRemember earlier I mentioned that the error, at times, is only an indication of a deeper underlying issue. For example, remote MySQL connections to 3rd party services. Using a 3rd party payment processing plugin for osCommerce, Magento, etc. MySQL database charset and collationChanging default database charset to latin1 and default collation to latin1_general_ci seemed to have solved MySQL server has gone away for some. Exceeding MySQL max_connections settingMax_connections set the maximum permitted number of simultaneous client connections. Be careful with this setting!! Exhaustion of memory and other resources can occur when set too large and scheduling overhead also increases. As a guide, set max_connections to approximately double the previous number of maximum simultaneous client connections. E.g., if after a month of uptime, the maximum simultaneous client connections were 114, then set to max_connections=250. Before you go crazy with this setting, please read: How MySQL Handles Client Connections. Still unresolved? See MySQL’s help page.Oracle has put together a nice self-help page for MySQL server has gone away errors. On that page, they also suggest that you make sure MySQL didn’t stop/restart during the query. Excerpt: “You can check whether the MySQL server died and restarted by executing mysqladmin version and examining the server’s uptime. If the client connection was broken because mysqld crashed and restarted, you should concentrate on finding the reason for the crash.” # mysqladmin version mysqladmin Ver 9.1 Distrib 10.1.40-MariaDB, for Linux on x86_64 Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others. Server version 10.1.40-MariaDB Protocol version 10 Connection Localhost via UNIX socket UNIX socket /var/lib/mysql/mysql.sock Uptime: 20 days 11 hours 49 min 40 sec Threads: 5 Questions: 1030744326 Slow queries: 3343 Opens: 3585 Flush tables: 1 Open tables: 2564 Queries per second avg: 582.150 # mysqladmin status Uptime: 1770590 Threads: 4 Questions: 1030752268 Slow queries: 3343 Opens: 3585 Flush tables: 1 Open tables: 2564 Queries per second avg: 582.151 I hope this helps!
Published: June 7th, 2019 | Last updated: August 10th, 2021 Tags: apm, linux, mariadb, mysql, performance, server, sysadminsHow do I fix Sqlstate HY000 2006 MySQL server has gone away?The MySQL server has gone away (error 2006) has two main causes and solutions: Server timed out and closed the connection. To fix, check that wait_timeout mysql variable in your my. cnf configuration file is large enough, eg wait_timeout = 28800.
Why MySQL server has gone away?The most common reason for the MySQL server has gone away error is that the server timed out and closed the connection. In this case, you normally get one of the following error codes (which one you get is operating system-dependent). The client couldn't send a question to the server.
How do I fix MySQL server error?Check the error log to see why the server does not start. ... . Specify any special options needed by the storage engines you are using. ... . Make sure that the server knows where to find the data directory. ... . Make sure that the server can access the data directory.. What is Sqlstate HY000?'HY000' is called the "general error": it is the class used for builtin conditions which do not have a specific SQLSTATE class. A partial list of error codes and matching SQLSTATE values can be found in the page MariaDB Error Codes.
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