innodb_flush_log_at_trx_commit
Hello, Does innodb_flush_log_at_trx_commit = 1 or 2 make a busy mysql server bad performance? We found that setting it to 0 will make disk IO decrease a lot. Thanks. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: innodb_flush_log_at_trx_commit
Setting this option is a trade-off between your durability requirement and performance requirement. http://dev.mysql.com/doc/refman/5.1/en/innodb-parameters.html#sysvar_innodb_flush_log_at_trx_commit 0 gives best performance (write + flush once every second). 1 gives best durability (write + flush after each commit). 2 writes the log buffer to the log file at every commit, but flush it once every second. On 10/16/2010 05:03 PM, short cutter wrote: Hello, Does innodb_flush_log_at_trx_commit = 1 or 2 make a busy mysql server bad performance? We found that setting it to 0 will make disk IO decrease a lot. Thanks. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
MySQL won't run on Ubuntu 10.10
MySQL List, I'm running Ubuntu 10.10, and I have a LAMP server which is not connected to the internet, but is just used for locally creating and testing web sites. MySQL does not seem to be running, however. Check out the output from these commands: ~$ sudo service mysql start mysql start/running ~$ ps -ef | grep mysql dave 23043 22341 0 23:57 pts/000:00:00 grep mysql If I understand these outputs, it says MySQL is running when I start it up, but, after that, if I look for the process, it doesn't show up as running. When I run any of my local web sites that rely on MySQL, they don't work, so I guess the final verdict is that MySQL isn't on. But, without any error when I try to start it, I'm not sure how to diagnose the problem. I tried purging then re-installing MySQL, but that didn't change anything. Any ideas on what else I could try? Thank you for any advice. -- Dave M G -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: MySQL won't run on Ubuntu 10.10
Check whether mysql is running: ps aux | grep mysqld If MySQL is not running, check /var/log/mysql/error.log for errors. Have you changed /etc/mysql/my.cnf and/or /etc/mysql/conf.d/*.cnf or are are you still using the default config files from Ubuntu? On 10/16/2010 06:30 PM, Dave M G wrote: MySQL List, I'm running Ubuntu 10.10, and I have a LAMP server which is not connected to the internet, but is just used for locally creating and testing web sites. MySQL does not seem to be running, however. Check out the output from these commands: ~$ sudo service mysql start mysql start/running ~$ ps -ef | grep mysql dave 23043 22341 0 23:57 pts/000:00:00 grep mysql If I understand these outputs, it says MySQL is running when I start it up, but, after that, if I look for the process, it doesn't show up as running. When I run any of my local web sites that rely on MySQL, they don't work, so I guess the final verdict is that MySQL isn't on. But, without any error when I try to start it, I'm not sure how to diagnose the problem. I tried purging then re-installing MySQL, but that didn't change anything. Any ideas on what else I could try? Thank you for any advice. -- Dave M G -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: MySQL won't run on Ubuntu 10.10 [SOLVED]
Bruijne, Thank you for responding. The my.cnf file was fine, but when you mentioned it, it sparked a long forgotten memory that there was something specific to Ubuntu that affects who has access to files like my.cnf. After a little web searching, I realized it is a security thing called Apparmour. Long story short, when I upgraded Ubuntu, I kept the my.cnf file that had served me well for years, but had overwritten /etc/apparmor.d/usr.sbin.mysqld with new default settings. Some of the directories in that file did not match my system. Editing the Apparmour file and restarting both Apparmour and MySQL solved the problem. Thank you for setting me in the right direction. -- Dave M G -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
about auto_increment id
Hello, I have a table which has the ID key with auto_increment and which is a primary key. If I insert the table with the id value which is generated by the program, for example, insert table (id, user_name, age) values (1000, 'kenn', 30); the value 1000 is inserted forcely, not generated by database automatically. Will this cause problem? Thanks. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: about auto_increment id
At 08:05 PM 10/16/2010, you wrote: Hello, I have a table which has the ID key with auto_increment and which is a primary key. If I insert the table with the id value which is generated by the program, for example, insert table (id, user_name, age) values (1000, 'kenn', 30); the value 1000 is inserted forcely, not generated by database automatically. Will this cause problem? Thanks. It is not going to cause a problem but it defeats the purpose of having an auto-inc column. After executing the SQL statement, the next Id inserted will be 1000. It is much better to let the table determine the next auto-inc value by using: insert table (id, user_name, age) values (NULL, 'kenn', 30); If you want to get the value of the Id that was used, simply reference the variable Last_Insert_Id as in: select Last_Insert_Id; See: http://dev.mysql.com/doc/refman/5.0/en/getting-unique-id.html Mike -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=mo...@fastmail.fm -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: about auto_increment id
At 08:55 PM 10/16/2010, you wrote: After executing the SQL statement, the next Id inserted will be 1000. Oops. I meant : After executing the SQL statement, the next Id inserted will be 1001. Mike -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: about auto_increment id
Hi, Is it possible to change this directive's value without modifition to my.cnf and restart mysqld? I remember there is a set @@variable syntax, but not sure. Thanks. 2010/10/17 mos mo...@fastmail.fm: At 08:55 PM 10/16/2010, you wrote: After executing the SQL statement, the next Id inserted will be 1000. Oops. I meant : After executing the SQL statement, the next Id inserted will be 1001. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
