How to query the MySQL log

First, check the location of the log:

MySQL log file I believe that everyone has a lot of understanding, MySQL log file is generally in:/var/log/mysqld.log, below teaches you to modify the MySQL log file location method, for your reference.

Today need to change the location of the MySQL log files, found in the/ETC/MY.CNF can not change.

The MySQL log bit was later found to be specified:

[[email protected] etc]# PS aux|grep mysqld root11830 0.5 0.0 4524 1204pts/0SGeneva:Geneva 0:xx/bin/sh/usr/bin/mysqld_safe--datadir=/data/mysql--socket=/var/lib/mysql/mysql.sock--log-error=/var/log/ Mysqld.log--pid-file=/var/run/mysqld/mysqld.pid MySQL11890 3.7 0.1 40456 9076pts/0SlGeneva:Geneva 0:xx/usr/libexec/mysqld--basedir=/usr--datadir=/data/mysql--user=mysql--pid-file=/var/run/mysqld/mysqld.pid-- Skip-external-locking--port=3306--socket=/var/lib/mysql/Mysql.sock Root11909 0.0 0.0 3908 664pts/0S+Geneva:Geneva 0:xxgrep mysqld

Ii. description of file types in MySQL

If a table has 3 files you said above, then the storage engine is MyISAM, which can be easily understood as:
*.frm--table Definition
*. myd--"D" Data information file
*. myi--"I" Index information file

Three

1. First verify that your log is enabled

1. MySQL>show variables like ' log_bin ';

2. If enabled, the on log file is in the data directory of the MySQL installation directory

3. How to know the current log

1. MySQL> Show master Status;

4. Look at the binary log file with Mysqlbinlog

1. Shell>mysqlbinlog mail-bin.000001

Or

1. Shell>mysqlbinlog mail-bin.000001 | tail

Because mail-bin.000001 is a binary log, so want to see the log will need to use the Mysqlbinlog command, the binary file into a log file, the following details how to use: The above has said that if the log file is enabled, then the default log file is in the data directory (if you have not changed) into Store the log file directory, use the Mysqlbinlog localhost-bin.000202 > New_file_name.log command, save the destination file as a log file, you can specify the save path under a little trick to introduce you, I was ready to switch to find that the log file is more than 2G, wondering why MySQL does not log the logs on a regular basis in a number of files. It turns out that MySQL has a better way to get data for a certain time period through time parameters, such as: Mysqlbinlog--start-datetime= "2010-11-20 00:00:00"--stop-datetime= " 2010-11-21 00:00:00 "

[Email protected] data]$ Mysqlbinlog mysqlbinlog Ver 3.0 for Pc-linux-gnu @ i686 by Monty and Sasha, for your profession Al Use this software comes with NO warranty:this was free software, and you were welcome to modify and redistribute it unde R the GPL license

Dumps a MySQL binary log in a format usable for viewing or for piping to the MySQL command line client

Usage:mysqlbinlog [Options] log-files-d,--database=name List entries for just the database (local log only). -D,--disable-log-bin  disable binary log. This is useful, if you have--to-last-log and is sending the output to the same MySQL server. This is the could avoid an endless loop. You would also if it is restoring after a crash to avoid duplication of the statements you already has. Note:you would need a SUPER privilege to use this option. -F,--force-read    force reading unknown binlog events. -?,--help          Display this help and exit. -H,--host=name     Get the Binlog from server. -O,--offset=#      Skip the first N entries. -p,--password[=name]  password to connect to remote server. -p,--port=#        use port to connect to the remote server. -j,--position=#    Deprecated. Use--start-position instead. --protocol=name     the Protocol of Connection (Tcp,socket,pipe,memory). -R,--result-file=name  Direct output to a given file. -R,--read-from-remote-server  read binary logs from a MySQL server--open_files_limit=#  used to reserve file D Escriptors for usage by this program-s,--short-form    Just Show the queries, no extra info. -S,--socket=name   socket file to use for connection. --start-datetime=name  start reading the Binlog at first event has a datetime equal or posterior to the argument; The argument must is a date and time in the local time zone, with any format accepted by the MySQL server for DATETIME and T Imestamp types, for example:2004-12-25 11:25:56 (you should probably use quotes for your shell to set it properly). --stop-datetime=name  stop reading the Binlog at first event has a datetime equal or posterior to the argument; The argument must is a date and time in the localTime zone, in any format accepted by the MySQL server for DATETIME and TIMESTAMP types, for example:2004-12-25 11:25:56 ( You should probably with quotes for your shell to set it properly). --start-position=# start reading the binlog at position N. Applies to the first Binlog passed on the command line. --stop-position=#   stop reading the binlog at position N. Applies to the last Binlog passed on the command line . -T,--to-last-log   requires-r. Won't stop at the end of the requested Binlog but rather continue printing until the end of the last binlog of the MYSQ L server. If you send the output to the same MySQL server, the. Endless loop. -U,--user=name     Connect to the remote server as username. -L,--local-load=name  Prepare local temporary files for load DATA INFILE in the specified directory. -V,--version       Print version and exit.

Variables (--variable-name=value) and Boolean options {false| TRUE} Value (after reading options)--------------------------------------------------------------database                            (No default value) disable-log-bin                    FALSE force-read                          FALSE host                               (No default value) offset                              0 PORT&NBsp;                              3306 position                            4 read-from-remote-server           FALSE Open_ files_limit                   short-form                         FALSE socket                              (No default value) start-datetime                     (No default value) stop-datetime                      (No default value) start-position                     4 stop-position                       18446744073709551615 to-last-log                        FALSE user                                (No default value) local-load                         (No default value)

2009.09.30 when checking for an application, MySQL does not log the operation's SQL statements to the journal file when it is updated with Oracle's Dblink connection, which is a bit depressing.

How to query the MySQL log