Tutorial _ MySQL

This article mainly introduces how to view execution statements and update logs in real time through MySQL logs. the methods described in this article use the mysqladmin command. For more information, see View the statements executed by MySQL
You can view the SQL statements executed by MySQL in real time, similar to the event probe in mssql. Set the my. ini file to open the file and modify it:

basedir=E:/MySQL 4.0.12 #bind-address=192.168.15.196 datadir=E:/MySQL 4.0.12/data #language=E:/MySQL 4.0.12/share/your language directory #slow query log#=slowqueris.log #tmpdir#= #port=3306 #set-variable=key_buffer=16M 

Ong_query_time = 1 -- indicates how long the SQL statement will be logged after execution. here, it is 1 second.

Log-slow-queries = slowqueris. log -- records slow statements returned by the query.

Log-queries-not-using-indexes = nouseindex. log -- it is a literal meaning that the query with no index is used in the log.

Log = mylog. log -- record all execution statements

When the preceding parameters are enabled, MySQL performance may be affected. we recommend that you disable them in the production environment.

How to use the new update log

If you only use one update log, you only need to clear the log file, then remove the old update log file to a backup, and then enable the new update log.

Use the following methods to force the server to enable new update logs:

mysqladmin flush-logs

You generally need to provide the following database users in the command line:

mysqladmin –u root –p flush-logs mysqladmin refresh

You generally need to provide the following database users in the command line:

mysqladmin –u root –p refresh

If you are using MySQL 3.21 or earlier, you must use mysqladmin refresh.
SQL commands

FLUSH LOGS

Restart the server

The preceding methods have the following functions:

Close and then open the standard and update record files. If you specify an update record file without an extension, the extension number of the new update record file will be 1 higher than that of the previous file.

mysql>FLUSH LOGS;

How to use new regular logs

The above method can also force update of regular logs.

To back up general logs, the steps may be complicated:

$ cd mysql-data-directory$ mv mysql.log mysql.old$ mysqladmin flush-tables

Make a backup and delete "mysql. old ".